/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2014-2020 Intel, Inc.  All rights reserved.
 * Copyright (c) 2017-2019 Research Organization for Information Science
 *                         and Technology (RIST).  All rights reserved.
 * Copyright (c) 2017      IBM Corporation. All rights reserved.
 *
 * Copyright (c) 2021-2023 Nanook Consulting.  All rights reserved.
 * Copyright (c) 2023      Triad National Security, LLC. All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */
#include "src/include/pmix_config.h"

#include "include/pmix.h"
#include "pmix_common.h"
#include "include/pmix_server.h"

#include "src/threads/pmix_threads.h"
#include "src/util/pmix_error.h"
#include "src/util/pmix_name_fns.h"
#include "src/util/pmix_output.h"

#include "src/client/pmix_client_ops.h"
#include "src/include/pmix_globals.h"
#include "src/mca/bfrops/bfrops.h"
#include "src/server/pmix_server_ops.h"

static void progress_local_event_hdlr(pmix_status_t status, pmix_info_t *results, size_t nresults,
                                      pmix_op_cbfunc_t cbfunc, void *thiscbdata,
                                      void *notification_cbdata);

/* if we are a client, we call this function to notify the server of
 * an event. If we are a server, our host RM will call this function
 * to notify us of an event */
PMIX_EXPORT pmix_status_t PMIx_Notify_event(pmix_status_t status, const pmix_proc_t *source,
                                            pmix_data_range_t range, const pmix_info_t info[],
                                            size_t ninfo, pmix_op_cbfunc_t cbfunc, void *cbdata)
{
    int rc;

    PMIX_ACQUIRE_THREAD(&pmix_global_lock);

    if (pmix_globals.init_cntr <= 0) {
        PMIX_RELEASE_THREAD(&pmix_global_lock);
        return PMIX_ERR_INIT;
    }

    if (PMIX_PEER_IS_SERVER(pmix_globals.mypeer) ||
        PMIX_PEER_IS_TOOL(pmix_globals.mypeer)) {
        PMIX_RELEASE_THREAD(&pmix_global_lock);

        pmix_output_verbose(2, pmix_server_globals.event_output,
                            "pmix_server_notify_event source = %s:%d event_status = %s",
                            (NULL == source) ? "UNKNOWN" : source->nspace,
                            (NULL == source) ? PMIX_RANK_WILDCARD : source->rank,
                            PMIx_Error_string(status));

        rc = pmix_server_notify_client_of_event(status, source, range, info, ninfo, cbfunc, cbdata);

        if (PMIX_SUCCESS != rc && PMIX_OPERATION_SUCCEEDED != rc) {
            PMIX_ERROR_LOG(rc);
        }
        if (PMIX_PEER_IS_SERVER(pmix_globals.mypeer) && !PMIX_PEER_IS_TOOL(pmix_globals.mypeer)) {
            return rc;
        }
        PMIX_ACQUIRE_THREAD(&pmix_global_lock);
    }

    /* if we aren't connected, don't attempt to send */
    if (!pmix_globals.connected && PMIX_RANGE_PROC_LOCAL != range) {
        PMIX_RELEASE_THREAD(&pmix_global_lock);
        return PMIX_ERR_UNREACH;
    }
    PMIX_RELEASE_THREAD(&pmix_global_lock);
    pmix_output_verbose(2, pmix_client_globals.event_output,
                        "pmix_client_notify_event source = %s:%d event_status =%d",
                        (NULL == source) ? pmix_globals.myid.nspace : source->nspace,
                        (NULL == source) ? pmix_globals.myid.rank : source->rank, status);

    rc = pmix_notify_server_of_event(status, source, range, info, ninfo, cbfunc, cbdata, true);
    if (PMIX_SUCCESS != rc) {
        PMIX_ERROR_LOG(rc);
    }
    return rc;
}

static void notify_event_cbfunc(struct pmix_peer_t *pr,
                                pmix_ptl_hdr_t *hdr,
                                pmix_buffer_t *buf,
                                void *cbdata)
{
    (void) hdr;
    pmix_status_t rc, ret = PMIX_ERR_LOST_CONNECTION;
    int32_t cnt = 1;
    pmix_cb_t *cb = (pmix_cb_t *) cbdata;

    if (0 < buf->bytes_used) {
        /* unpack the status */
        PMIX_BFROPS_UNPACK(rc, pr, buf, &ret, &cnt, PMIX_STATUS);
        if (PMIX_SUCCESS != rc) {
            PMIX_ERROR_LOG(rc);
            ret = rc;
        }
    }
    /* do the cback */
    if (NULL != cb->cbfunc.opfn) {
        cb->cbfunc.opfn(ret, cb->cbdata);
    }
    PMIX_RELEASE(cb);
}

pmix_status_t pmix_notify_event_cache(pmix_notify_caddy_t *cd)
{
    pmix_status_t rc;
    int j;
    pmix_notify_caddy_t *pk;
    int idx;
    time_t etime;

    /* add to our cache */
    rc = pmix_hotel_checkin(&pmix_globals.notifications, cd, &cd->room);
    /* if there wasn't room, then search for the longest tenured
     * occupant and evict them */
    if (PMIX_SUCCESS != rc) {
        etime = 0;
        idx = -1;
        for (j = 0; j < pmix_globals.max_events; j++) {
            pmix_hotel_knock(&pmix_globals.notifications, j, (void **) &pk);
            if (NULL == pk) {
                /* hey, there is room! */
                pmix_hotel_checkin_with_res(&pmix_globals.notifications, cd, &cd->room);
                return PMIX_SUCCESS;
            }
            /* check the age */
            if (0 == j) {
                etime = pk->ts;
                idx = j;
            } else {
                if (difftime(pk->ts, etime) < 0) {
                    etime = pk->ts;
                    idx = j;
                }
            }
        }
        if (0 <= idx) {
            /* we found the oldest occupant - evict it */
            pmix_hotel_checkout_and_return_occupant(&pmix_globals.notifications, idx,
                                                    (void **) &pk);
            PMIX_RELEASE(pk);
            rc = pmix_hotel_checkin(&pmix_globals.notifications, cd, &cd->room);
        }
    }
    return rc;
}

/* as a client, we pass the notification to our server */
pmix_status_t pmix_notify_server_of_event(pmix_status_t status, const pmix_proc_t *source,
                                          pmix_data_range_t range, const pmix_info_t info[],
                                          size_t ninfo, pmix_op_cbfunc_t cbfunc, void *cbdata,
                                          bool dolocal)
{
    pmix_status_t rc;
    pmix_buffer_t *msg = NULL;
    pmix_cmd_t cmd = PMIX_NOTIFY_CMD;
    pmix_cb_t *cb;
    pmix_event_chain_t *chain = NULL;
    size_t n;
    bool holdcd;
    pmix_notify_caddy_t *cd;

    pmix_output_verbose(2, pmix_client_globals.event_output,
                        "[%s:%d] client: notifying server %s:%d of status %s for range %s",
                        pmix_globals.myid.nspace, pmix_globals.myid.rank,
                        pmix_client_globals.myserver->info->pname.nspace,
                        pmix_client_globals.myserver->info->pname.rank, PMIx_Error_string(status),
                        PMIx_Data_range_string(range));

    holdcd = true;
    if (0 < ninfo) {
        /* check for caching instructions */
        for (n = 0; n < ninfo; n++) {
            if (PMIX_CHECK_KEY(&info[n], PMIX_EVENT_DO_NOT_CACHE)) {
                if (PMIX_INFO_TRUE(&info[n])) {
                    holdcd = false;
                }
                break;
            }
        }
    }

    if (PMIX_RANGE_PROC_LOCAL != range) {
        /* create the msg object */
        msg = PMIX_NEW(pmix_buffer_t);
        if (NULL == msg) {
            return PMIX_ERR_NOMEM;
        }
        /* pack the command */
        PMIX_BFROPS_PACK(rc, pmix_client_globals.myserver, msg, &cmd, 1, PMIX_COMMAND);
        if (PMIX_SUCCESS != rc) {
            PMIX_ERROR_LOG(rc);
            goto cleanup;
        }
        /* pack the status */
        PMIX_BFROPS_PACK(rc, pmix_client_globals.myserver, msg, &status, 1, PMIX_STATUS);
        if (PMIX_SUCCESS != rc) {
            PMIX_ERROR_LOG(rc);
            goto cleanup;
        }
        /* no need to pack the source as it is us */

        /* pack the range */
        PMIX_BFROPS_PACK(rc, pmix_client_globals.myserver, msg, &range, 1, PMIX_DATA_RANGE);
        if (PMIX_SUCCESS != rc) {
            PMIX_ERROR_LOG(rc);
            goto cleanup;
        }
        /* pack the info */
        PMIX_BFROPS_PACK(rc, pmix_client_globals.myserver, msg, &ninfo, 1, PMIX_SIZE);
        if (PMIX_SUCCESS != rc) {
            PMIX_ERROR_LOG(rc);
            goto cleanup;
        }
        if (0 < ninfo) {
            PMIX_BFROPS_PACK(rc, pmix_client_globals.myserver, msg, info, ninfo, PMIX_INFO);
            if (PMIX_SUCCESS != rc) {
                PMIX_ERROR_LOG(rc);
                goto cleanup;
            }
        }
    }

    if (dolocal) {
        /* setup for our own local callbacks */
        chain = PMIX_NEW(pmix_event_chain_t);
        chain->status = status;
        chain->range = range;
        if (NULL == source) {
            PMIX_LOAD_PROCID(&chain->source, pmix_globals.myid.nspace, pmix_globals.myid.rank);
        } else {
            PMIX_LOAD_PROCID(&chain->source, source->nspace, source->rank);
        }
        /* we always leave space for event hdlr name and a callback object */
        chain->nallocated = ninfo + 2;
        PMIX_INFO_CREATE(chain->info, chain->nallocated);
        /* prep the chain for processing */
        pmix_prep_event_chain(chain, info, ninfo, true);

        if (PMIX_RANGE_PROC_LOCAL == range && holdcd) {
            /* we need to cache this event so we can pass it into
             * ourselves should someone later register for it */
            cd = PMIX_NEW(pmix_notify_caddy_t);
            cd->status = status;
            PMIX_LOAD_PROCID(&cd->source, chain->source.nspace, chain->source.rank);
            cd->range = chain->range;
            if (0 < chain->ninfo) {
                cd->ninfo = chain->ninfo;
                PMIX_INFO_CREATE(cd->info, cd->ninfo);
                cd->nondefault = chain->nondefault;
                /* need to copy the info */
                for (n = 0; n < cd->ninfo; n++) {
                    PMIX_INFO_XFER(&cd->info[n], &chain->info[n]);
                }
            }
            if (NULL != chain->targets) {
                cd->ntargets = chain->ntargets;
                PMIX_PROC_CREATE(cd->targets, cd->ntargets);
                memcpy(cd->targets, chain->targets, cd->ntargets * sizeof(pmix_proc_t));
            }
            if (NULL != chain->affected) {
                cd->naffected = chain->naffected;
                PMIX_PROC_CREATE(cd->affected, cd->naffected);
                if (NULL == cd->affected) {
                    cd->naffected = 0;
                    rc = PMIX_ERR_NOMEM;
                    goto cleanup;
                }
                memcpy(cd->affected, chain->affected, cd->naffected * sizeof(pmix_proc_t));
            }
            rc = pmix_notify_event_cache(cd);
            if (PMIX_SUCCESS != rc) {
                PMIX_ERROR_LOG(rc);
                PMIX_RELEASE(cd);
                goto cleanup;
            }
            chain->cached = true;
        }
    }

    if (PMIX_RANGE_PROC_LOCAL != range && NULL != msg) {
        /* if this is a "lost-connection" event, then there is no
         * server to pass it to! Likewise, we don't pass it to
         * ourselves */
        if (PMIX_ERR_LOST_CONNECTION == status ||
            pmix_globals.mypeer == pmix_client_globals.myserver) {
            PMIX_RELEASE(msg);
            goto local;
        }
        /* create a callback object as we need to pass it to the
         * recv routine so we know which callback to use when
         * the server acks/nacks the register events request. The
         * server will _not_ send this notification back to us,
         * so we handle it locally */
        cb = PMIX_NEW(pmix_cb_t);
        cb->cbfunc.opfn = cbfunc;
        cb->cbdata = cbdata;
        /* send to the server */
        pmix_output_verbose(2, pmix_client_globals.event_output,
                            "[%s:%d] client: notifying server %s:%d - sending",
                            pmix_globals.myid.nspace, pmix_globals.myid.rank,
                            pmix_client_globals.myserver->info->pname.nspace,
                            pmix_client_globals.myserver->info->pname.rank);
        PMIX_PTL_SEND_RECV(rc, pmix_client_globals.myserver, msg, notify_event_cbfunc, cb);
        if (PMIX_SUCCESS != rc) {
            PMIX_ERROR_LOG(rc);
            PMIX_RELEASE(cb);
            goto cleanup;
        }
    } else if (NULL != cbfunc) {
        cbfunc(PMIX_SUCCESS, cbdata);
    }

local:
    if (dolocal) {
        /* now notify any matching registered callbacks we have */
        pmix_invoke_local_event_hdlr(chain);
    }

    return PMIX_SUCCESS;

cleanup:
    pmix_output_verbose(2, pmix_client_globals.event_output,
                        "client: notifying server - unable to send");
    if (NULL != msg) {
        PMIX_RELEASE(msg);
    }
    /* we were unable to send anything, so we just return the error */
    return rc;
}

static void cycle_events(int sd, short args, void *cbdata)
{
    pmix_event_chain_t *chain = (pmix_event_chain_t *) cbdata;
    size_t n, nsave, cnt;
    pmix_list_item_t *item;
    pmix_event_hdlr_t *nxt;
    pmix_info_t *newinfo;

    pmix_output_verbose(2, pmix_client_globals.event_output,
                        "%s progressing local event with status %s",
                        PMIX_NAME_PRINT(&pmix_globals.myid),
                        PMIx_Error_string(chain->interim_status));

    PMIX_HIDE_UNUSED_PARAMS(sd, args);

    /* aggregate the results per RFC0018 - first search the
     * prior chained results to see if any keys have been NULL'd
     * as this indicates that info struct should be removed */
    nsave = 0;
    for (n = 0; n < chain->nresults; n++) {
        if (0 < strlen(chain->results[n].key)) {
            ++nsave;
        }
    }
    /* we have to at least record the status returned by each
     * stage of the event handler chain, so we have to reallocate
     * the array to make space */

    /* add in any new results plus space for the returned status */
    nsave += chain->ninterim + 1;
    /* create the new space */
    PMIX_INFO_CREATE(newinfo, nsave);
    /* transfer over the prior data */
    cnt = 0;
    for (n = 0; n < chain->nresults; n++) {
        if (0 < strlen(chain->results[n].key)) {
            PMIX_INFO_XFER(&newinfo[cnt], &chain->results[n]);
            ++cnt;
        }
    }

    /* save this handler's returned status */
    if (NULL != chain->evhdlr && NULL != chain->evhdlr->name) {
        pmix_strncpy(newinfo[cnt].key, chain->evhdlr->name, PMIX_MAX_KEYLEN);
    } else {
        pmix_strncpy(newinfo[cnt].key, "UNKNOWN", PMIX_MAX_KEYLEN);
    }
    newinfo[cnt].value.type = PMIX_STATUS;
    newinfo[cnt].value.data.status = chain->status;
    ++cnt;
    /* transfer across the new results */
    for (n = 0; n < chain->ninterim; n++) {
        PMIX_INFO_XFER(&newinfo[cnt], &chain->interim[n]);
        ++cnt;
    }
    /* release the prior results */
    if (0 < chain->nresults) {
        PMIX_INFO_FREE(chain->results, chain->nresults);
    }
    /* pass along the new ones */
    chain->results = newinfo;
    chain->nresults = cnt;
    /* clear any loaded name and object */
    if (chain->nallocated > chain->ninfo) {
        chain->ninfo = chain->nallocated - 2;
        PMIX_INFO_DESTRUCT(&chain->info[chain->nallocated - 2]);
        PMIX_INFO_DESTRUCT(&chain->info[chain->nallocated - 1]);
    }
    // call their interim cbfunc
    if (NULL != chain->opcbfunc) {
        chain->opcbfunc(chain->interim_status, chain->cbdata);
    }

    /* if the caller indicates that the chain is completed,
     * or we completed the "last" event */
    if (PMIX_EVENT_ACTION_COMPLETE == chain->interim_status ||
        PMIX_EVENT_ORDER_LAST_OVERALL == chain->evhdlr->precedence || chain->endchain) {
        if (PMIX_EVENT_ACTION_COMPLETE == chain->interim_status) {
            chain->interim_status = PMIX_SUCCESS;
        }
        if (chain->evhdlr->oneshot) {
            /* remove this handler */
            pmix_deregister_event_hdlr(chain->evhdlr->index, NULL);
        }
        goto complete;
    }
    item = NULL;

    /* see if we need to continue, starting with the single code events */
    if (1 == chain->evhdlr->ncodes) {
        /* the last handler was for a single code - see if there are
         * any others that match this event */
        if (PMIX_EVENT_ORDER_FIRST_OVERALL == chain->evhdlr->precedence) {
            item = pmix_list_get_begin(&pmix_globals.events.single_events);
        } else {
            item = &chain->evhdlr->super;
        }
        while (pmix_list_get_end(&pmix_globals.events.single_events) != (item = pmix_list_get_next(item))) {
            nxt = (pmix_event_hdlr_t *) item;
            if (nxt->codes[0] == chain->status && pmix_notify_check_range(&nxt->rng, &chain->source)
                && pmix_notify_check_affected(nxt->affected, nxt->naffected, chain->affected,
                                              chain->naffected)) {
                chain->evhdlr = nxt;
                /* reset our count to the info provided by the caller */
                chain->ninfo = chain->nallocated - 2;
                /* if the handler has a name, then provide it */
                if (NULL != chain->evhdlr->name) {
                    PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_HDLR_NAME,
                                   chain->evhdlr->name, PMIX_STRING);
                    chain->ninfo++;
                }

                /* if there is an evhdlr cbobject, provide it */
                if (NULL != chain->evhdlr->cbobject) {
                    PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_RETURN_OBJECT,
                                   chain->evhdlr->cbobject, PMIX_POINTER);
                    chain->ninfo++;
                }
                nxt->evhdlr(nxt->index, chain->status, &chain->source, chain->info, chain->ninfo,
                            chain->results, chain->nresults, progress_local_event_hdlr,
                            (void *) chain);
                return;
            }
        }
        /* if we get here, then there are no more single code
         * events that match */
        item = pmix_list_get_begin(&pmix_globals.events.multi_events);
    }

    /* see if we need to continue with the multi code events */
    if (NULL != chain->evhdlr->codes || NULL != item) {
        /* the last handler was for a multi-code event, or we exhausted
         * all the single code events */
        if (PMIX_EVENT_ORDER_FIRST_OVERALL == chain->evhdlr->precedence) {
            item = pmix_list_get_begin(&pmix_globals.events.multi_events);
        } else if (NULL == item) {
            /* if the last handler was multi-code, then start from that point */
            item = &chain->evhdlr->super;
        }
        while (pmix_list_get_end(&pmix_globals.events.multi_events)
               != (item = pmix_list_get_next(item))) {
            nxt = (pmix_event_hdlr_t *) item;
            if (!pmix_notify_check_range(&nxt->rng, &chain->source)
                || !pmix_notify_check_affected(nxt->affected, nxt->naffected, chain->affected,
                                               chain->naffected)) {
                continue;
            }
            for (n = 0; n < nxt->ncodes; n++) {
                /* if this event handler provided a range, check to see if
                 * the source fits within it */
                if (nxt->codes[n] == chain->status) {
                    chain->evhdlr = nxt;
                    /* reset our count to the info provided by the caller */
                    chain->ninfo = chain->nallocated - 2;
                    /* if the handler has a name, then provide it */
                    if (NULL != chain->evhdlr->name) {
                        PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_HDLR_NAME,
                                       chain->evhdlr->name, PMIX_STRING);
                        chain->ninfo++;
                    }

                    /* if there is an evhdlr cbobject, provide it */
                    if (NULL != chain->evhdlr->cbobject) {
                        PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_RETURN_OBJECT,
                                       chain->evhdlr->cbobject, PMIX_POINTER);
                        chain->ninfo++;
                    }
                    nxt->evhdlr(nxt->index, chain->status, &chain->source, chain->info,
                                chain->ninfo, chain->results, chain->nresults,
                                progress_local_event_hdlr, (void *) chain);
                    return;
                }
            }
        }
        /* if we get here, then there are no more multi-mode
         * events that match */
        item = pmix_list_get_begin(&pmix_globals.events.default_events);
    }

    /* if they didn't want it to go to a default handler, then ignore them */
    if (!chain->nondefault) {
        if (PMIX_EVENT_ORDER_FIRST_OVERALL == chain->evhdlr->precedence) {
            item = pmix_list_get_begin(&pmix_globals.events.default_events);
        } else if (NULL == item) {
            item = &chain->evhdlr->super;
        }
        if (pmix_list_get_end(&pmix_globals.events.default_events) != (item = pmix_list_get_next(item))) {
            nxt = (pmix_event_hdlr_t *) item;
            /* if this event handler provided a range, check to see if
             * the source fits within it */
            if (pmix_notify_check_range(&nxt->rng, &chain->source)
                && pmix_notify_check_affected(nxt->affected, nxt->naffected, chain->affected,
                                              chain->naffected)) {
                chain->evhdlr = nxt;
                /* reset our count to the info provided by the caller */
                chain->ninfo = chain->nallocated - 2;
                /* if the handler has a name, then provide it */
                if (NULL != chain->evhdlr->name) {
                    PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_HDLR_NAME,
                                   chain->evhdlr->name, PMIX_STRING);
                    chain->ninfo++;
                }

                /* if there is an evhdlr cbobject, provide it */
                if (NULL != chain->evhdlr->cbobject) {
                    PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_RETURN_OBJECT,
                                   chain->evhdlr->cbobject, PMIX_POINTER);
                    chain->ninfo++;
                }
                nxt->evhdlr(nxt->index, chain->status, &chain->source, chain->info, chain->ninfo,
                            chain->results, chain->nresults, progress_local_event_hdlr,
                            (void *) chain);
                return;
            }
        }
    }

    /* if we registered a "last" handler, and it fits the given range
     * and code, then invoke it now */
    if (NULL != pmix_globals.events.last
        && pmix_notify_check_range(&pmix_globals.events.last->rng, &chain->source)
        && pmix_notify_check_affected(pmix_globals.events.last->affected,
                                      pmix_globals.events.last->naffected, chain->affected,
                                      chain->naffected)) {
        chain->endchain = true; // ensure we don't do this again
        if (1 == pmix_globals.events.last->ncodes
            && pmix_globals.events.last->codes[0] == chain->status) {
            chain->evhdlr = pmix_globals.events.last;
            /* reset our count to the info provided by the caller */
            chain->ninfo = chain->nallocated - 2;
            /* if the handler has a name, then provide it */
            if (NULL != chain->evhdlr->name) {
                PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_HDLR_NAME,
                               chain->evhdlr->name, PMIX_STRING);
                chain->ninfo++;
            }

            /* if there is an evhdlr cbobject, provide it */
            if (NULL != chain->evhdlr->cbobject) {
                PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_RETURN_OBJECT,
                               chain->evhdlr->cbobject, PMIX_POINTER);
                chain->ninfo++;
            }
            chain->evhdlr->evhdlr(chain->evhdlr->index, chain->status, &chain->source, chain->info,
                                  chain->ninfo, chain->results, chain->nresults,
                                  progress_local_event_hdlr, (void *) chain);
            return;
        } else if (NULL != pmix_globals.events.last->codes) {
            /* need to check if this code is included in the array */
            for (n = 0; n < pmix_globals.events.last->ncodes; n++) {
                if (pmix_globals.events.last->codes[n] == chain->status) {
                    chain->evhdlr = pmix_globals.events.last;
                    /* reset our count to the info provided by the caller */
                    chain->ninfo = chain->nallocated - 2;
                    /* if the handler has a name, then provide it */
                    if (NULL != chain->evhdlr->name) {
                        PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_HDLR_NAME,
                                       chain->evhdlr->name, PMIX_STRING);
                        chain->ninfo++;
                    }

                    /* if there is an evhdlr cbobject, provide it */
                    if (NULL != chain->evhdlr->cbobject) {
                        PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_RETURN_OBJECT,
                                       chain->evhdlr->cbobject, PMIX_POINTER);
                        chain->ninfo++;
                    }
                    chain->evhdlr->evhdlr(chain->evhdlr->index, chain->status, &chain->source,
                                          chain->info, chain->ninfo, chain->results,
                                          chain->nresults, progress_local_event_hdlr,
                                          (void *) chain);
                    return;
                }
            }
        } else {
            /* gets run for all codes */
            chain->evhdlr = pmix_globals.events.last;
            /* reset our count to the info provided by the caller */
            chain->ninfo = chain->nallocated - 2;
            /* if the handler has a name, then provide it */
            if (NULL != chain->evhdlr->name) {
                PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_HDLR_NAME,
                               chain->evhdlr->name, PMIX_STRING);
                chain->ninfo++;
            }

            /* if there is an evhdlr cbobject, provide it */
            if (NULL != chain->evhdlr->cbobject) {
                PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_RETURN_OBJECT,
                               chain->evhdlr->cbobject, PMIX_POINTER);
                chain->ninfo++;
            }
            chain->evhdlr->evhdlr(chain->evhdlr->index, chain->status, &chain->source, chain->info,
                                  chain->ninfo, chain->results, chain->nresults,
                                  progress_local_event_hdlr, (void *) chain);
            return;
        }
    }

complete:
    /* if we get here, there was nothing more to do, but
     * we still have to call their final callback */
    if (NULL != chain->final_cbfunc) {
        chain->final_cbfunc(chain->interim_status, chain->final_cbdata);
        return;
    }
    /* maintain acctng */
    PMIX_RELEASE(chain);
}

static void progress_local_event_hdlr(pmix_status_t status, pmix_info_t *results, size_t nresults,
                                      pmix_op_cbfunc_t cbfunc, void *thiscbdata,
                                      void *notification_cbdata)
{
    /* this may be in the host's thread, so we need to threadshift it
     * before accessing our internal data */

    pmix_event_chain_t *chain = (pmix_event_chain_t *) notification_cbdata;

    chain->interim_status = status;
    chain->interim = results;
    chain->ninterim = nresults;
    chain->opcbfunc = cbfunc;
    chain->cbdata = thiscbdata;
    PMIX_THREADSHIFT(chain, cycle_events);
}

/* given notification of an event, cycle thru our list of
 * registered callbacks and invoke the matching ones. Note
 * that we will invoke the callbacks in order from single
 * to multi-event to default, keeping a log of any returned
 * info and passing it down to the next invoked event handler.
 * Thus, each handler is given the opportunity to see what
 * prior handlers did, and decide if anything further needs
 * to be done.
 */
void pmix_invoke_local_event_hdlr(pmix_event_chain_t *chain)
{
    /* We need to parse thru each registered handler and determine
     * which one(s) to call for the specific error */
    size_t i;
    pmix_event_hdlr_t *evhdlr;
    pmix_status_t rc = PMIX_SUCCESS;
    bool found;

    pmix_output_verbose(2, pmix_client_globals.event_output,
                        "%s invoke_local_event_hdlr for status %s",
                        PMIX_NAME_PRINT(&pmix_globals.myid),
                        PMIx_Error_string(chain->status));

    /* sanity check */
    if (NULL == chain->info) {
        /* should never happen as space must always be
         * reserved for handler name and callback object*/
        rc = PMIX_ERR_BAD_PARAM;
        pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                            PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
        goto complete;
    }

    /* if we are not a target, then we can simply ignore this event */
    if (NULL != chain->targets) {
        found = false;
        for (i = 0; i < chain->ntargets; i++) {
            pmix_output_verbose(8, pmix_client_globals.event_output, "%s CHECKING TARGET %s",
                                PMIX_NAME_PRINT(&pmix_globals.myid),
                                PMIX_NAME_PRINT(&chain->targets[i]));
            if (PMIX_CHECK_PROCID(&chain->targets[i], &pmix_globals.myid)) {
                found = true;
                break;
            }
        }
        if (!found) {
            pmix_output_verbose(8, pmix_client_globals.event_output,
                                "%s Ignoring event %s:%d",
                                PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
            goto complete;
        }
    }
    pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                        PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);

    /* if we registered a "first" handler, and it fits the given range,
     * then invoke it first */
    if (NULL != pmix_globals.events.first) {
        if (1 == pmix_globals.events.first->ncodes
            && pmix_globals.events.first->codes[0] == chain->status
            && pmix_notify_check_range(&pmix_globals.events.first->rng, &chain->source)
            && pmix_notify_check_affected(pmix_globals.events.first->affected,
                                          pmix_globals.events.first->naffected, chain->affected,
                                          chain->naffected)) {
            /* invoke the handler */
            chain->evhdlr = pmix_globals.events.first;
            pmix_output_verbose(8, pmix_client_globals.event_output, "%s INVOKING FIRST %s:%d",
                                PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
            goto invk;
        } else if (NULL != pmix_globals.events.first->codes) {
            /* need to check if this code is included in the array */
            found = false;
            for (i = 0; i < pmix_globals.events.first->ncodes; i++) {
                if (pmix_globals.events.first->codes[i] == chain->status) {
                    found = true;
                    break;
                }
            }
            /* if this event handler provided a range, check to see if
             * the source fits within it */
            if (found && pmix_notify_check_range(&pmix_globals.events.first->rng, &chain->source)) {
                /* invoke the handler */
                chain->evhdlr = pmix_globals.events.first;
                pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                    PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
                goto invk;
            }
        } else {
            /* take all codes for a default handler */
            if (pmix_notify_check_range(&pmix_globals.events.first->rng, &chain->source)) {
                /* invoke the handler */
                chain->evhdlr = pmix_globals.events.first;
                pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                    PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
                goto invk;
            }
        }
        /* get here if there is no match, so fall thru */
    }
    pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                        PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);

    /* cycle thru the single-event registrations first */
    PMIX_LIST_FOREACH (evhdlr, &pmix_globals.events.single_events, pmix_event_hdlr_t) {
        if (evhdlr->codes[0] == chain->status) {
            if (pmix_notify_check_range(&evhdlr->rng, &chain->source)
                && pmix_notify_check_affected(evhdlr->affected, evhdlr->naffected, chain->affected,
                                              chain->naffected)) {
                /* invoke the handler */
                chain->evhdlr = evhdlr;
                pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                    PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
                goto invk;
            }
        }
    }

    /* if we didn't find any match in the single-event registrations,
     * then cycle thru the multi-event registrations next */
    PMIX_LIST_FOREACH (evhdlr, &pmix_globals.events.multi_events, pmix_event_hdlr_t) {
        for (i = 0; i < evhdlr->ncodes; i++) {
            if (evhdlr->codes[i] == chain->status) {
                if (pmix_notify_check_range(&evhdlr->rng, &chain->source)
                    && pmix_notify_check_affected(evhdlr->affected, evhdlr->naffected,
                                                  chain->affected, chain->naffected)) {
                    /* invoke the handler */
                    chain->evhdlr = evhdlr;
                    pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                        PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
                    goto invk;
                }
            }
        }
    }
    pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                        PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);

    /* if they didn't want it to go to a default handler, then ignore them */
    if (!chain->nondefault) {
        /* pass it to any default handlers */
        PMIX_LIST_FOREACH (evhdlr, &pmix_globals.events.default_events, pmix_event_hdlr_t) {
            if (pmix_notify_check_range(&evhdlr->rng, &chain->source)
                && pmix_notify_check_affected(evhdlr->affected, evhdlr->naffected, chain->affected,
                                              chain->naffected)) {
                /* invoke the handler */
                chain->evhdlr = evhdlr;
                pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                    PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
                goto invk;
            }
        }
    }

    /* if we registered a "last" handler, and it fits the given range
     * and code, then invoke it now */
    if (NULL != pmix_globals.events.last
        && pmix_notify_check_range(&pmix_globals.events.last->rng, &chain->source)
        && pmix_notify_check_affected(pmix_globals.events.last->affected,
                                      pmix_globals.events.last->naffected, chain->affected,
                                      chain->naffected)) {
        chain->endchain = true; // ensure we don't do this again
        if (1 == pmix_globals.events.last->ncodes
            && pmix_globals.events.last->codes[0] == chain->status) {
            chain->evhdlr = pmix_globals.events.last;
            pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
            goto invk;
        } else if (NULL != pmix_globals.events.last->codes) {
            /* need to check if this code is included in the array */
            for (i = 0; i < pmix_globals.events.last->ncodes; i++) {
                if (pmix_globals.events.last->codes[i] == chain->status) {
                    chain->evhdlr = pmix_globals.events.last;
                    pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                        PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
                    goto invk;
                }
            }
        } else {
            /* gets run for all codes */
            chain->evhdlr = pmix_globals.events.last;
            pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                                PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
            goto invk;
        }
    }
    pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                        PMIX_NAME_PRINT(&pmix_globals.myid),
                        __FILE__, __LINE__);

    /* if we got here, then nothing was found */
    rc = PMIX_ERR_NOT_FOUND;

complete:
    /* we still have to call their final callback */
    if (NULL != chain->final_cbfunc) {
        chain->final_cbfunc(rc, chain->final_cbdata);
    } else {
        PMIX_RELEASE(chain);
    }
    return;

invk:
    pmix_output_verbose(8, pmix_client_globals.event_output, "%s %s:%d",
                        PMIX_NAME_PRINT(&pmix_globals.myid), __FILE__, __LINE__);
    /* start with the chain holding only the given info */
    chain->ninfo = chain->nallocated - 2;

    /* if the handler has a name, then provide it */
    if (NULL != chain->evhdlr->name) {
        PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_HDLR_NAME, chain->evhdlr->name,
                       PMIX_STRING);
        chain->ninfo++;
    }

    /* if there is an evhdlr cbobject, provide it */
    if (NULL != chain->evhdlr->cbobject) {
        PMIX_INFO_LOAD(&chain->info[chain->ninfo], PMIX_EVENT_RETURN_OBJECT,
                       chain->evhdlr->cbobject, PMIX_POINTER);
        chain->ninfo++;
    }

    /* invoke the handler */
    pmix_output_verbose(2, pmix_client_globals.event_output, "[%s:%d] INVOKING EVHDLR %s", __FILE__,
                        __LINE__, (NULL == chain->evhdlr->name) ? "NULL" : chain->evhdlr->name);
    chain->evhdlr->evhdlr(chain->evhdlr->index, chain->status, &chain->source, chain->info,
                          chain->ninfo, NULL, 0, progress_local_event_hdlr, (void *) chain);
    return;
}

static void local_cbfunc(pmix_status_t status, void *cbdata)
{
    pmix_notify_caddy_t *cd = (pmix_notify_caddy_t *) cbdata;

    if (NULL != cd->cbfunc) {
        cd->cbfunc(status, cd->cbdata);
    }
    PMIX_RELEASE(cd);
}

static void _notify_client_event(int sd, short args, void *cbdata)
{
    (void) sd;
    (void) args;
    pmix_notify_caddy_t *cd = (pmix_notify_caddy_t *) cbdata;
    pmix_regevents_info_t *reginfoptr;
    pmix_peer_events_info_t *pr;
    pmix_event_chain_t *chain;
    size_t n, nleft;
    bool matched, holdcd;
    pmix_buffer_t *bfr;
    pmix_cmd_t cmd = PMIX_NOTIFY_CMD;
    pmix_status_t rc;
    pmix_list_t trk;
    pmix_namelist_t *nm;
    pmix_namespace_t *nptr, *tmp;
    pmix_range_trkr_t rngtrk;
    pmix_proc_t proc;

    /* need to acquire the object from its originating thread */
    PMIX_ACQUIRE_OBJECT(cd);

    pmix_output_verbose(2, pmix_server_globals.event_output,
                        "pmix_server: _notify_client_event notifying clients of event %s range %s",
                        PMIx_Error_string(cd->status), PMIx_Data_range_string(cd->range));

    /* check for caching instructions */
    holdcd = true;
    if (0 < cd->ninfo) {
        /* check for caching instructions */
        for (n = 0; n < cd->ninfo; n++) {
            if (PMIX_CHECK_KEY(&cd->info[n], PMIX_EVENT_DO_NOT_CACHE)) {
                if (PMIX_INFO_TRUE(&cd->info[n])) {
                    holdcd = false;
                }
                break;
            }
        }
    }
    if (holdcd) {
        /* we cannot know if everyone who wants this notice has had a chance
         * to register for it - the notice may be coming too early. So cache
         * the message until all local procs have received it, or it ages to
         * the point where it gets pushed out by more recent events */
        PMIX_RETAIN(cd);
        rc = pmix_notify_event_cache(cd);
        if (PMIX_SUCCESS != rc) {
            PMIX_ERROR_LOG(rc);
        }
    }

    /* we may also have registered for events, so setup to check this
     * against our registrations */
    chain = PMIX_NEW(pmix_event_chain_t);
    chain->status = cd->status;
    if (holdcd) {
        chain->cached = true;
    }
    PMIX_LOAD_PROCID(&chain->source, cd->source.nspace, cd->source.rank);
    /* we always leave space for a callback object and
     * the evhandler name. */
    chain->nallocated = cd->ninfo + 2;
    PMIX_INFO_CREATE(chain->info, chain->nallocated);
    /* prep the chain for processing */
    pmix_prep_event_chain(chain, cd->info, cd->ninfo, true);
    cd->nondefault = chain->nondefault;
    /* if the range is PMIX_RANGE_RM, then we only process this
     * event ourselves - the PMIx server may aggregate the
     * events from a namespace prior to passing it to the host */
    if (PMIX_RANGE_RM == cd->range) {
        goto local;
    }
    /* if we are a tool, we send it to our clients regardless
     * of the range - we assume that if we are in range, then
     * so are any clients attached to us
     *
     * if we are a server but not a tool, then check the range
     * before sending it to our client */
    if (PMIX_PEER_IS_TOOL(pmix_globals.mypeer)) {
        /* remove the target designations */
        if (NULL != chain->targets) {
            free(chain->targets);
            chain->targets = NULL;
            chain->ntargets = 0;
        }
    }

    /* copy setup to the cd object */
    cd->nondefault = chain->nondefault;
    if (NULL != chain->targets) {
        cd->ntargets = chain->ntargets;
        PMIX_PROC_CREATE(cd->targets, cd->ntargets);
        memcpy(cd->targets, chain->targets, cd->ntargets * sizeof(pmix_proc_t));
        /* compute the number of targets that need to be notified */
        nleft = 0;
        for (n = 0; n < cd->ntargets; n++) {
            /* if this is a single proc, then increment by one */
            if (PMIX_RANK_VALID >= cd->targets[n].rank) {
                ++nleft;
            } else {
                /* look up the nspace for this proc */
                nptr = NULL;
                PMIX_LIST_FOREACH (tmp, &pmix_globals.nspaces, pmix_namespace_t) {
                    if (PMIX_CHECK_NSPACE(tmp->nspace, cd->targets[n].nspace)) {
                        nptr = tmp;
                        break;
                    }
                }
                /* if we don't yet know it, then nothing to do */
                if (NULL == nptr) {
                    nleft = SIZE_MAX;
                    break;
                }
                /* might notify all local members */
                nleft += nptr->nlocalprocs;
            }
        }
        cd->nleft = nleft;
    }
    if (NULL != chain->affected) {
        cd->naffected = chain->naffected;
        PMIX_PROC_CREATE(cd->affected, cd->naffected);
        if (NULL == cd->affected) {
            cd->naffected = 0;
            /* notify the caller */
            if (NULL != cd->cbfunc) {
                cd->cbfunc(PMIX_ERR_NOMEM, cd->cbdata);
            }
            PMIX_RELEASE(cd);
            PMIX_RELEASE(chain);
            return;
        }
        memcpy(cd->affected, chain->affected, cd->naffected * sizeof(pmix_proc_t));
    }

    /* if they provided a PMIX_EVENT_CUSTOM_RANGE info object but
     * specified a range other than PMIX_RANGE_CUSTOM, then this
     * is an error */
    if (PMIX_RANGE_CUSTOM != cd->range && NULL != cd->targets) {
        PMIX_ERROR_LOG(PMIX_ERR_BAD_PARAM);
        /* notify the caller */
        if (NULL != cd->cbfunc) {
            cd->cbfunc(PMIX_ERR_BAD_PARAM, cd->cbdata);
        }
        PMIX_RELEASE(cd);
        PMIX_RELEASE(chain);
        return;
    }

    holdcd = false;
    if (PMIX_RANGE_PROC_LOCAL != cd->range) {
        PMIX_CONSTRUCT(&trk, pmix_list_t);
        rngtrk.procs = NULL;
        rngtrk.nprocs = 0;
        /* cycle across our registered events and send the message to
         * any client who registered for it */
        PMIX_LIST_FOREACH (reginfoptr, &pmix_server_globals.events, pmix_regevents_info_t) {
            if ((PMIX_MAX_ERR_CONSTANT == reginfoptr->code && !cd->nondefault) ||
                cd->status == reginfoptr->code) {
                PMIX_LIST_FOREACH (pr, &reginfoptr->peers, pmix_peer_events_info_t) {
                    /* if this client was the source of the event, then
                     * don't send it back as they will have processed it
                     * when they generated it */
                    if (PMIX_CHECK_NAMES(&cd->source, &pr->peer->info->pname)) {
                        continue;
                    }
                    /* don't notify ourselves - we handle this internally */
                    if (PMIX_CHECK_NAMES(&pmix_globals.myid, &pr->peer->info->pname)) {
                        continue;
                    }
                    /* if we have already notified this client, then don't do it again */
                    matched = false;
                    PMIX_LIST_FOREACH (nm, &trk, pmix_namelist_t) {
                        if (nm->pname == &pr->peer->info->pname) {
                            matched = true;
                            break;
                        }
                    }
                    if (matched) {
                        continue;
                    }
                    /* check if the affected procs (if given) match those they
                     * wanted to know about */
                    if (!pmix_notify_check_affected(cd->affected, cd->naffected, pr->affected,
                                                    pr->naffected)) {
                        continue;
                    }
                    if (!PMIX_PEER_IS_TOOL(pmix_globals.mypeer) && NULL != cd->targets) {
                        rngtrk.procs = cd->targets;
                        rngtrk.nprocs = cd->ntargets;
                        rngtrk.range = cd->range;
                        PMIX_LOAD_PROCID(&proc, pr->peer->info->pname.nspace,
                                         pr->peer->info->pname.rank);
                        if (!pmix_notify_check_range(&rngtrk, &proc)) {
                            continue;
                        }
                    }
                    pmix_output_verbose(2, pmix_server_globals.event_output,
                                        "pmix_server: notifying client %s:%u on status %s",
                                        pr->peer->info->pname.nspace, pr->peer->info->pname.rank,
                                        PMIx_Error_string(cd->status));

                    /* record that we notified this client */
                    nm = PMIX_NEW(pmix_namelist_t);
                    nm->pname = &pr->peer->info->pname;
                    pmix_list_append(&trk, &nm->super);

                    bfr = PMIX_NEW(pmix_buffer_t);
                    if (NULL == bfr) {
                        continue;
                    }
                    /* pack the command */
                    PMIX_BFROPS_PACK(rc, pr->peer, bfr, &cmd, 1, PMIX_COMMAND);
                    if (PMIX_SUCCESS != rc) {
                        PMIX_ERROR_LOG(rc);
                        PMIX_RELEASE(bfr);
                        continue;
                    }

                    /* pack the status */
                    PMIX_BFROPS_PACK(rc, pr->peer, bfr, &cd->status, 1, PMIX_STATUS);
                    if (PMIX_SUCCESS != rc) {
                        PMIX_ERROR_LOG(rc);
                        PMIX_RELEASE(bfr);
                        continue;
                    }

                    /* pack the source */
                    PMIX_BFROPS_PACK(rc, pr->peer, bfr, &cd->source, 1, PMIX_PROC);
                    if (PMIX_SUCCESS != rc) {
                        PMIX_ERROR_LOG(rc);
                        PMIX_RELEASE(bfr);
                        continue;
                    }
                    /* pack any info */
                    PMIX_BFROPS_PACK(rc, pr->peer, bfr, &cd->ninfo, 1, PMIX_SIZE);
                    if (PMIX_SUCCESS != rc) {
                        PMIX_ERROR_LOG(rc);
                        PMIX_RELEASE(bfr);
                        continue;
                    }

                    if (0 < cd->ninfo) {
                        PMIX_BFROPS_PACK(rc, pr->peer, bfr, cd->info, cd->ninfo, PMIX_INFO);
                        if (PMIX_SUCCESS != rc) {
                            PMIX_ERROR_LOG(rc);
                            PMIX_RELEASE(bfr);
                            continue;
                        }
                    }
                    /* pack the range in case they need to relay */
                    PMIX_BFROPS_PACK(rc, pr->peer, bfr, &cd->range, 1, PMIX_DATA_RANGE);
                    if (PMIX_SUCCESS != rc) {
                        PMIX_ERROR_LOG(rc);
                        PMIX_RELEASE(bfr);
                        continue;
                    }

                    PMIX_SERVER_QUEUE_REPLY(rc, pr->peer, 0, bfr);
                    if (PMIX_SUCCESS != rc) {
                        PMIX_RELEASE(bfr);
                    }
                    if (NULL != cd->targets && 0 < cd->nleft) {
                        /* track the number of targets we have left to notify */
                        --cd->nleft;
                        /* if the event was cached and this is the last one,
                         * then evict this event from the cache */
                        if (0 == cd->nleft) {
                            pmix_hotel_checkout(&pmix_globals.notifications, cd->room);
                            holdcd = false;
                            break;
                        }
                    }
                }
            }
        }
        PMIX_LIST_DESTRUCT(&trk);
        if (PMIX_RANGE_LOCAL != cd->range &&
            PMIX_CHECK_PROCID(&cd->source, &pmix_globals.myid)) {
            /* if we are the source, then we need to post this upwards as
             * well so the host RM can broadcast it as necessary */
            if (NULL != pmix_host_server.notify_event) {
                /* mark that we sent it upstairs so we don't release
                 * the caddy until we return from the host RM */
                rc = pmix_host_server.notify_event(cd->status, &cd->source, cd->range, cd->info,
                                                   cd->ninfo, local_cbfunc, cd);
                if (PMIX_SUCCESS == rc) {
                    holdcd = true;
                }
            }
        }
    }

local:
    /* process it ourselves */
    pmix_invoke_local_event_hdlr(chain);

    if (!holdcd) {
        /* notify the caller */
        if (NULL != cd->cbfunc) {
            cd->cbfunc(PMIX_SUCCESS, cd->cbdata);
        }
        PMIX_RELEASE(cd);
    }
}

/* as a server, we must do two things:
 *
 * (a) notify all clients that have registered for this event
 *
 * (b) callback any of our own functions that have registered
 *     for this event
 */
pmix_status_t pmix_server_notify_client_of_event(pmix_status_t status, const pmix_proc_t *source,
                                                 pmix_data_range_t range, const pmix_info_t info[],
                                                 size_t ninfo, pmix_op_cbfunc_t cbfunc,
                                                 void *cbdata)
{
    pmix_notify_caddy_t *cd;
    size_t n;

    pmix_output_verbose(2, pmix_server_globals.event_output,
                        "pmix_server: notify client of event %s range %s",
                        PMIx_Error_string(status), PMIx_Data_range_string(range));

    cd = PMIX_NEW(pmix_notify_caddy_t);
    cd->status = status;
    if (NULL == source) {
        PMIX_LOAD_PROCID(&cd->source, "UNDEF", PMIX_RANK_UNDEF);
    } else {
        PMIX_LOAD_PROCID(&cd->source, source->nspace, source->rank);
    }
    cd->range = range;
    /* have to copy the info to preserve it for future when cached */
    if (0 < ninfo && NULL != info) {
        cd->ninfo = ninfo;
        PMIX_INFO_CREATE(cd->info, cd->ninfo);
        /* need to copy the info */
        for (n = 0; n < cd->ninfo; n++) {
            PMIX_INFO_XFER(&cd->info[n], &info[n]);
        }
    }

    /* track the eventual callback info */
    cd->cbfunc = cbfunc;
    cd->cbdata = cbdata;

    pmix_output_verbose(2, pmix_server_globals.event_output,
                        "pmix_server_notify_event status =%d, source = %s:%d, ninfo =%lu", status,
                        cd->source.nspace, cd->source.rank, ninfo);

    /* we have to push this into our event library to avoid
     * potential threading issues */
    PMIX_THREADSHIFT(cd, _notify_client_event);
    return PMIX_SUCCESS;
}

bool pmix_notify_check_range(pmix_range_trkr_t *rng, const pmix_proc_t *proc)
{
    size_t n;

    if (PMIX_RANGE_UNDEF == rng->range || PMIX_RANGE_GLOBAL == rng->range
        || PMIX_RANGE_SESSION == rng->range
        || PMIX_RANGE_LOCAL == rng->range) { // assume RM took care of session & local for now
        return true;
    }
    if (PMIX_RANGE_NAMESPACE == rng->range) {
        for (n = 0; n < rng->nprocs; n++) {
            if (PMIX_CHECK_NSPACE(rng->procs[n].nspace, proc->nspace)) {
                return true;
            }
        }
        return false;
    }
    if (PMIX_RANGE_PROC_LOCAL == rng->range) {
        for (n = 0; n < rng->nprocs; n++) {
            if (PMIX_CHECK_PROCID(&rng->procs[n], proc)) {
                return true;
            }
        }
        return false;
    }
    if (PMIX_RANGE_CUSTOM == rng->range) {
        /* see if this proc was included */
        for (n = 0; n < rng->nprocs; n++) {
            if (0 != strncmp(rng->procs[n].nspace, proc->nspace, PMIX_MAX_NSLEN)) {
                continue;
            }
            if (PMIX_RANK_WILDCARD == rng->procs[n].rank || rng->procs[n].rank == proc->rank) {
                return true;
            }
        }
        /* if we get here, then this proc isn't in range */
        return false;
    }

    /* if it is anything else, then reject it */
    return false;
}

bool pmix_notify_check_affected(pmix_proc_t *interested, size_t ninterested, pmix_proc_t *affected,
                                size_t naffected)
{
    size_t m, n;

    /* if they didn't restrict their interests, then accept it */
    if (NULL == interested) {
        return true;
    }
    /* if we weren't given the affected procs, then accept it */
    if (NULL == affected) {
        return true;
    }
    /* check if the two overlap */
    for (n = 0; n < naffected; n++) {
        for (m = 0; m < ninterested; m++) {
            if (PMIX_CHECK_PROCID(&affected[n], &interested[m])) {
                return true;
            }
        }
    }
    /* if we get here, then this proc isn't in range */
    return false;
}

void pmix_event_timeout_cb(int fd, short flags, void *arg)
{
    (void) fd;
    (void) flags;
    pmix_event_chain_t *ch = (pmix_event_chain_t *) arg;

    /* need to acquire the object from its originating thread */
    PMIX_ACQUIRE_OBJECT(ch);

    ch->timer_active = false;

    /* remove it from the list */
    pmix_list_remove_item(&pmix_globals.cached_events, &ch->super);

    /* process this event thru the regular channels */
    if (PMIX_PEER_IS_SERVER(pmix_globals.mypeer) &&
        !PMIX_PEER_IS_LAUNCHER(pmix_globals.mypeer)) {
        pmix_server_notify_client_of_event(ch->status, &ch->source, ch->range,
                                           ch->info, ch->ninfo,
                                           ch->final_cbfunc, ch->final_cbdata);
    } else {
        pmix_invoke_local_event_hdlr(ch);
    }
}

pmix_status_t pmix_prep_event_chain(pmix_event_chain_t *chain, const pmix_info_t *info,
                                    size_t ninfo, bool xfer)
{
    size_t n;

    if (NULL != info && 0 < ninfo) {
        chain->ninfo = ninfo;
        if (NULL == chain->info) {
            PMIX_INFO_CREATE(chain->info, chain->ninfo);
        }
        /* need to copy the info */
        for (n = 0; n < ninfo; n++) {
            if (xfer) {
                /* chain doesn't already have a copy of the info */
                PMIX_INFO_XFER(&chain->info[n], &info[n]);
            }
            /* look for specific directives */
            if (0 == strncmp(info[n].key, PMIX_EVENT_NON_DEFAULT, PMIX_MAX_KEYLEN)) {
                chain->nondefault = PMIX_INFO_TRUE(&info[n]);
            } else if (PMIX_CHECK_KEY(&info[n], PMIX_EVENT_CUSTOM_RANGE)) {
                /* provides an array of pmix_proc_t identifying the procs
                 * that are to receive this notification, or a single pmix_proc_t  */
                if (PMIX_DATA_ARRAY == info[n].value.type && NULL != info[n].value.data.darray
                    && NULL != info[n].value.data.darray->array) {
                    chain->ntargets = info[n].value.data.darray->size;
                    PMIX_PROC_CREATE(chain->targets, chain->ntargets);
                    memcpy(chain->targets, info[n].value.data.darray->array,
                           chain->ntargets * sizeof(pmix_proc_t));
                } else if (PMIX_PROC == info[n].value.type) {
                    chain->ntargets = 1;
                    PMIX_PROC_CREATE(chain->targets, chain->ntargets);
                    memcpy(chain->targets, info[n].value.data.proc, sizeof(pmix_proc_t));
                } else {
                    /* this is an error */
                    PMIX_ERROR_LOG(PMIX_ERR_BAD_PARAM);
                    return PMIX_ERR_BAD_PARAM;
                }
            } else if (PMIX_CHECK_KEY(&info[n], PMIX_EVENT_AFFECTED_PROC)) {
                PMIX_PROC_CREATE(chain->affected, 1);
                if (NULL == chain->affected) {
                    return PMIX_ERR_NOMEM;
                }
                chain->naffected = 1;
                memcpy(chain->affected, info[n].value.data.proc, sizeof(pmix_proc_t));
            } else if (PMIX_CHECK_KEY(&info[n], PMIX_EVENT_AFFECTED_PROCS)) {
                chain->naffected = info[n].value.data.darray->size;
                PMIX_PROC_CREATE(chain->affected, chain->naffected);
                if (NULL == chain->affected) {
                    chain->naffected = 0;
                    return PMIX_ERR_NOMEM;
                }
                memcpy(chain->affected, info[n].value.data.darray->array,
                       chain->naffected * sizeof(pmix_proc_t));
            }
        }
    }
    return PMIX_SUCCESS;
}

/****    CLASS INSTANTIATIONS    ****/

static void sevcon(pmix_event_hdlr_t *p)
{
    p->name = NULL;
    p->index = UINT_MAX;
    p->precedence = PMIX_EVENT_ORDER_NONE;
    p->oneshot = false;
    p->locator = NULL;
    p->rng.range = PMIX_RANGE_UNDEF;
    p->rng.procs = NULL;
    p->rng.nprocs = 0;
    p->affected = NULL;
    p->naffected = 0;
    p->evhdlr = NULL;
    p->cbobject = NULL;
    p->codes = NULL;
    p->ncodes = 0;
}
static void sevdes(pmix_event_hdlr_t *p)
{
    if (NULL != p->name) {
        free(p->name);
    }
    if (NULL != p->locator) {
        free(p->locator);
    }
    if (NULL != p->rng.procs) {
        free(p->rng.procs);
    }
    if (NULL != p->affected) {
        PMIX_PROC_FREE(p->affected, p->naffected);
    }
    if (NULL != p->codes) {
        free(p->codes);
    }
}
PMIX_CLASS_INSTANCE(pmix_event_hdlr_t, pmix_list_item_t, sevcon, sevdes);

static void accon(pmix_active_code_t *p)
{
    p->nregs = 0;
}
PMIX_CLASS_INSTANCE(pmix_active_code_t, pmix_list_item_t, accon, NULL);

static void evcon(pmix_events_t *p)
{
    p->nhdlrs = 0;
    p->first = NULL;
    p->last = NULL;
    PMIX_CONSTRUCT(&p->actives, pmix_list_t);
    PMIX_CONSTRUCT(&p->single_events, pmix_list_t);
    PMIX_CONSTRUCT(&p->multi_events, pmix_list_t);
    PMIX_CONSTRUCT(&p->default_events, pmix_list_t);
}
static void evdes(pmix_events_t *p)
{
    if (NULL != p->first) {
        PMIX_RELEASE(p->first);
    }
    if (NULL != p->last) {
        PMIX_RELEASE(p->last);
    }
    PMIX_LIST_DESTRUCT(&p->actives);
    PMIX_LIST_DESTRUCT(&p->single_events);
    PMIX_LIST_DESTRUCT(&p->multi_events);
    PMIX_LIST_DESTRUCT(&p->default_events);
}
PMIX_CLASS_INSTANCE(pmix_events_t,
                    pmix_object_t,
                    evcon, evdes);

static void chcon(pmix_event_chain_t *p)
{
    p->timer_active = false;
    memset(p->source.nspace, 0, PMIX_MAX_NSLEN + 1);
    p->source.rank = PMIX_RANK_UNDEF;
    p->nondefault = false;
    p->endchain = false;
    p->cached = false;
    p->targets = NULL;
    p->ntargets = 0;
    p->range = PMIX_RANGE_UNDEF;
    p->affected = NULL;
    p->naffected = 0;
    p->info = NULL;
    p->ninfo = 0;
    p->nallocated = 0;
    p->interim_status = PMIX_ERROR;
    p->results = NULL;
    p->nresults = 0;
    p->interim = NULL;
    p->ninterim = 0;
    p->evhdlr = NULL;
    p->opcbfunc = NULL;
    p->cbdata = NULL;
    p->final_cbfunc = NULL;
    p->final_cbdata = NULL;
}
static void chdes(pmix_event_chain_t *p)
{
    if (p->timer_active) {
        pmix_event_del(&p->ev);
    }
    if (NULL != p->targets) {
        PMIX_PROC_FREE(p->targets, p->ntargets);
    }
    if (NULL != p->affected) {
        PMIX_PROC_FREE(p->affected, p->naffected);
    }
    if (NULL != p->info) {
        PMIX_INFO_FREE(p->info, p->nallocated);
    }
    if (NULL != p->results) {
        PMIX_INFO_FREE(p->results, p->nresults);
    }
}
PMIX_CLASS_INSTANCE(pmix_event_chain_t,
                    pmix_list_item_t,
                    chcon, chdes);
