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#include <stdlib.h>
#include <stdio.h>
#include <mpi.h>
#include <pmix.h>
#define SIZE 20
#define POS 10
#define INITIAL_VALUE 10
static pmix_proc_t myproc;
/* this is the event notification function we pass down below
* when registering for general events - i.e.,, the default
* handler. We don't technically need to register one, but it
* is usually good practice to catch any events that occur */
static void notification_fn(size_t evhdlr_registration_id,
pmix_status_t status,
const pmix_proc_t *source,
pmix_info_t info[], size_t ninfo,
pmix_info_t results[], size_t nresults,
pmix_event_notification_cbfunc_fn_t cbfunc,
void *cbdata)
{
/* this example doesn't do anything with default events */
fprintf(stderr, "Default event handler called with status %s\n", PMIx_Error_string(status));
if (NULL != cbfunc) {
cbfunc(PMIX_EVENT_ACTION_COMPLETE, NULL, 0, NULL, NULL, cbdata);
}
}
/* this is an event notification function that we explicitly request
* be called when the PMIX_MODEL_DECLARED notification is issued.
* We could catch it in the general event notification function and test
* the status to see if the status matched, but it often is simpler
* to declare a use-specific notification callback point. In this case,
* we are asking to know whenever a programming model library is
* instantiated */
static void model_callback(size_t evhdlr_registration_id,
pmix_status_t status,
const pmix_proc_t *source,
pmix_info_t info[], size_t ninfo,
pmix_info_t results[], size_t nresults,
pmix_event_notification_cbfunc_fn_t cbfunc,
void *cbdata)
{
size_t n;
fprintf(stderr, "Model event handler called with status %d(%s)\n", status, PMIx_Error_string(status));
/* check to see what model declared itself */
for (n=0; n < ninfo; n++) {
if (PMIX_STRING == info[n].value.type) {
fprintf(stderr, "\t%s:\t%s\n", info[n].key, info[n].value.data.string);
}
}
/* we must NOT tell the event handler state machine that we
* are the last step as that will prevent it from notifying
* anyone else that might be listening for declarations */
if (NULL != cbfunc) {
cbfunc(PMIX_SUCCESS, NULL, 0, NULL, NULL, cbdata);
}
}
/* event handler registration is done asynchronously because it
* may involve the PMIx server registering with the host RM for
* external events. So we provide a callback function that returns
* the status of the request (success or an error), plus a numerical index
* to the registered event. The index is used later on to deregister
* an event handler - if we don't explicitly deregister it, then the
* PMIx server will do so when it see us exit */
static void model_registration_callback(pmix_status_t status,
size_t evhandler_ref,
void *cbdata)
{
volatile int *active = (volatile int*)cbdata;
if (PMIX_SUCCESS != status) {
fprintf(stderr, "Client %s:%d EVENT HANDLER REGISTRATION FAILED WITH STATUS %d, ref=%lu\n",
myproc.nspace, myproc.rank, status, (unsigned long)evhandler_ref);
}
*active = status;
}
int main(int argc, char *argv[])
{
int i, rank, size, next, prev, tag = 201;
int array_size = SIZE;
int pos = POS;
int *send_array;
int *recv_array;
pmix_info_t *info;
size_t ninfo;
pmix_status_t code = PMIX_MODEL_DECLARED;
pmix_status_t rc;
volatile int active;
if (1 < argc) {
fprintf(stderr, "Declaring ourselves\n");
/* declare ourselves as a non-MPI library prior to MPI_Init */
ninfo = 4;
PMIX_INFO_CREATE(info, ninfo);
PMIX_INFO_LOAD(&info[0], PMIX_PROGRAMMING_MODEL, "EXAMPLE", PMIX_STRING);
PMIX_INFO_LOAD(&info[1], PMIX_MODEL_LIBRARY_NAME, "FOOL", PMIX_STRING);
PMIX_INFO_LOAD(&info[2], PMIX_MODEL_LIBRARY_VERSION, "1.2.3", PMIX_STRING);
PMIX_INFO_LOAD(&info[3], PMIX_THREADING_MODEL, "NONE", PMIX_STRING);
if (PMIX_SUCCESS != (rc = PMIx_Init(&myproc, info, ninfo))) {
fprintf(stderr, "PMIx Init failed: %s\n", PMIx_Error_string(rc));
exit(1);
}
PMIX_INFO_FREE(info, ninfo);
/* register a handler specifically for when models declare */
active = -1;
ninfo = 1;
PMIX_INFO_CREATE(info, ninfo);
PMIX_INFO_LOAD(&info[0], PMIX_EVENT_HDLR_NAME, "APP-MODEL", PMIX_STRING);
PMIx_Register_event_handler(&code, 1, info, ninfo,
model_callback, model_registration_callback, (void*)&active);
while (-1 == active) {
usleep(10);
}
PMIX_INFO_FREE(info, ninfo);
if (0 != active) {
exit(active);
}
}
/* initialize the MPI library - it will declare itself */
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
if (argc <= 1) {
fprintf(stderr, "Registering handler\n");
/* register a handler specifically for when models declare */
active = -1;
ninfo = 1;
PMIX_INFO_CREATE(info, ninfo);
PMIX_INFO_LOAD(&info[0], PMIX_EVENT_HDLR_NAME, "APP-MODEL", PMIX_STRING);
PMIx_Register_event_handler(&code, 1, info, ninfo,
model_callback, model_registration_callback, (void*)&active);
while (-1 == active) {
usleep(10);
}
PMIX_INFO_FREE(info, ninfo);
if (0 != active) {
exit(active);
}
}
fprintf(stderr, "Rank %d has cleared MPI_Init\n", rank);
next = (rank + 1) % size;
prev = (rank + size - 1) % size;
send_array = malloc(sizeof(int) * SIZE);
recv_array = malloc(sizeof(int) * SIZE);
for (i = 0; i < array_size; ++i) {
send_array[i] = 17;
recv_array[i] = -1;
}
if (0 == rank) {
send_array[pos] = INITIAL_VALUE;
MPI_Send(send_array, array_size, MPI_INT, next, tag,
MPI_COMM_WORLD);
}
/* if we didn't already do it, declare another model now */
if (argc <= 1) {
fprintf(stderr, "Declaring ourselves\n");
/* declare ourselves as a non-MPI library after MPI_Init */
ninfo = 4;
PMIX_INFO_CREATE(info, ninfo);
PMIX_INFO_LOAD(&info[0], PMIX_PROGRAMMING_MODEL, "EXAMPLE", PMIX_STRING);
PMIX_INFO_LOAD(&info[1], PMIX_MODEL_LIBRARY_NAME, "FOOL", PMIX_STRING);
PMIX_INFO_LOAD(&info[2], PMIX_MODEL_LIBRARY_VERSION, "1.2.3", PMIX_STRING);
PMIX_INFO_LOAD(&info[3], PMIX_THREADING_MODEL, "NONE", PMIX_STRING);
if (PMIX_SUCCESS != (rc = PMIx_Init(&myproc, info, ninfo))) {
fprintf(stderr, "PMIx Init failed: %s\n", PMIx_Error_string(rc));
exit(1);
}
PMIX_INFO_FREE(info, ninfo);
}
while (1) {
recv_array[pos] = -1;
MPI_Recv(recv_array, array_size, MPI_INT, prev, tag,
MPI_COMM_WORLD, MPI_STATUS_IGNORE);
send_array[pos] = recv_array[pos];
if (rank == 0) {
--send_array[pos];
}
MPI_Send(send_array, array_size, MPI_INT, next, tag, MPI_COMM_WORLD);
if (0 == send_array[pos]) {
break;
}
}
if (rank == 0) {
MPI_Recv(recv_array, array_size, MPI_INT, prev, tag,
MPI_COMM_WORLD, MPI_STATUS_IGNORE);
}
fprintf(stderr, "Rank %d has completed ring\n", rank);
MPI_Barrier(MPI_COMM_WORLD);
fprintf(stderr, "Rank %d has completed MPI_Barrier\n", rank);
/* decrement the PMIx refcount */
PMIx_Finalize(NULL, 0);
MPI_Finalize();
return 0;
}
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