kupl_shm_win_free

#include <stdio.h>
#include <mpi.h>
#include <unistd.h>
#include <string.h>
#include "kupl.h"
 
// Callback 1 required for creating a KUPL communicator.
static int oob_barrier_callback(void *group)
{
    return MPI_Barrier((MPI_Comm)group);
}
// Callback 2 required for creating a KUPL communicator.
static int oob_allgather_callback(const void *sendbuf, void *recvbuf, int size, void *group,
                                  kupl_shm_datatype_t datatype)
{
    switch (datatype) {
        case KUPL_SHM_DATATYPE_CHAR:
            return MPI_Allgather(sendbuf, size, MPI_CHAR, recvbuf, size, MPI_CHAR, (MPI_Comm)group);
        default:
            fprintf(stderr, "not support datatype");
            return KUPL_ERROR;
    }
}
int main(int argc, char *argv[])
{
    // Initialize the MPI environment.
    MPI_Init(&argc, &argv);
    MPI_Comm comm = MPI_COMM_WORLD;
    // Obtain the size of the MPI communicator.
    int world_size;
    MPI_Comm_size(comm, &world_size);
    // Obtain the rank of the process.
    int world_rank;
    MPI_Comm_rank(comm, &world_rank);
    // Obtain the PID.
    int pid = getpid();
    // Create a KUPL communicator.
    kupl_shm_oob_cb_t oob_cbs;
    kupl_shm_oob_cb_h oob_cbs_h = &oob_cbs;
    oob_cbs_h->oob_allgather = oob_allgather_callback;
    oob_cbs_h->oob_barrier = oob_barrier_callback;
    kupl_shm_comm_h kupl_comm;
    int ret = kupl_shm_comm_create(world_size, world_rank, pid, oob_cbs_h, (void *)comm, &kupl_comm);
    if (ret != KUPL_OK || kupl_comm == NULL) {
        fprintf(stderr, "kupl shm comm create failed: %d\n", ret);
        return -1;
    }
    // Allocate the shared memory.
    kupl_shm_win_h win;
    void *local_buffer;
    int count = 4;
    size_t buf_size = count * sizeof(int);
    ret = kupl_shm_win_alloc(buf_size, kupl_comm, &local_buffer, &win);
    if (ret != KUPL_OK) {
        fprintf(stderr, "kupl shm win alloc failed: %d\n", ret);
        return -1;
    }
    // Process 0 assigns a value to its own buffer.
    if (world_rank == 0) {
        for (int i = 0; i < count; i++) {
            ((int *)local_buffer)[i] = i;
        }
    }
    // All other processes obtain the buffer of process 0 for memcpy.
    if (world_rank != 0) {
        void *remote_buffer;
        int remote_rank = 0;
        kupl_shm_win_query(win, remote_rank, &remote_buffer);
        memcpy(local_buffer, remote_buffer, buf_size);
        // Check whether memcpy is successful.
        bool check = true;
        for (int i = 0; i < count; i++) {
            if (((int *)local_buffer)[i] != i) {
                check = false;
                break;
            }
        }
        if (check) {
            printf("check success\n");
        } else {
            printf("check fail\n");
        }
    }
    // Destroy the shared memory.
    kupl_shm_win_free(win);
    // Destroy the KUPL communicator.
    kupl_shm_comm_destroy(kupl_comm);
    MPI_Finalize();
    return 0;
}