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#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/types.h>
#include <unistd.h>
#include <pmix.h>
int main(int argc, char *argv[])
{
pmix_status_t rc;
int size;
pid_t pid;
pmix_proc_t myproc;
pmix_proc_t proc, parent;
pmix_app_t app;
pmix_proc_t peers[2];
char hostname[1024];
pmix_value_t *val = NULL;
pmix_nspace_t nspace;
pid = getpid();
gethostname(hostname, 1024);
rc = PMIx_Init(&myproc, NULL, 0);
if (PMIX_SUCCESS != rc) {
fprintf(stderr, "Client: PMIx_Init failed: %s\n", PMIx_Error_string(rc));
exit(1);
}
PMIX_LOAD_PROCID(&proc, myproc.nspace, PMIX_RANK_WILDCARD);
rc = PMIx_Get(&proc, PMIX_JOB_SIZE, NULL, 0, &val);
if (PMIX_SUCCESS != rc) {
fprintf(stderr, "Client ns %s rank %d: PMIx_Get job size failed: %s\n", myproc.nspace,
myproc.rank, PMIx_Error_string(rc));
goto done;
}
PMIX_VALUE_GET_NUMBER(rc, val, size, int);
if (PMIX_SUCCESS != rc) {
fprintf(stderr, "Client ns %s rank %d: get size number failed: %s\n", myproc.nspace,
myproc.rank, PMIx_Error_string(rc));
goto done;
}
PMIX_VALUE_RELEASE(val);
rc = PMIx_Get(&myproc, PMIX_PARENT_ID, NULL, 0, &val);
/* If we don't find it, then we're the parent */
if (PMIX_SUCCESS != rc) {
if (0 == myproc.rank) {
pid = getpid();
PMIX_APP_CONSTRUCT(&app);
app.cmd = strdup(argv[0]);
PMIX_ARGV_APPEND(rc, app.argv, argv[0]);
app.maxprocs = 3;
rc = PMIx_Spawn(NULL, 0, &app, 1, nspace);
if (PMIX_SUCCESS != rc) {
printf("Child failed to spawn\n");
return rc;
}
/* post a piece of information our children should get */
PMIX_LOAD_PROCID(&peers[0], myproc.nspace, 0);
PMIX_LOAD_PROCID(&peers[1], nspace, PMIX_RANK_WILDCARD);
/* connect to the children */
rc = PMIx_Connect(peers, 2, NULL, 0);
if (PMIX_SUCCESS != rc) {
printf("Connect to children failed!\n");
}
rc = PMIx_Disconnect(peers, 2, NULL, 0);
if (PMIX_SUCCESS != rc) {
printf("Disonnect from children failed!\n");
}
}
PMIX_LOAD_PROCID(&peers[0], myproc.nspace, PMIX_RANK_WILDCARD);
PMIx_Fence(&peers[0], 1, NULL, 0);
}
/* Otherwise, we're the child */
else {
PMIX_LOAD_PROCID(&peers[0], val->data.proc->nspace, 0);
PMIX_LOAD_PROCID(&peers[1], myproc.nspace, PMIX_RANK_WILDCARD);
PMIX_VALUE_RELEASE(val);
/* connect to our parent */
if (1 == myproc.rank) {
sleep(1);
}
rc = PMIx_Connect(peers, 2, NULL, 0);
if (PMIX_SUCCESS != rc) {
printf("%s.%u: Connect to parent failed!\n", myproc.nspace, myproc.rank);
}
if (2 == myproc.rank) {
sleep(1);
}
rc = PMIx_Disconnect(peers, 2, NULL, 0);
if (PMIX_SUCCESS != rc) {
printf("Disonnect from parent failed!\n");
}
}
done:
PMIx_Finalize(NULL, 0);
return 0;
}
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