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#include <stdlib.h>
#include <stdio.h>
#include <mpi.h>
#include <pthread.h>
#include <unistd.h>
void* thread_fun(void* arg)
{
printf("Thread going to sleep\n");
sleep(3);
printf("Thread done sleeping\n");
}
int main(int argc, char* argv[])
{
int rank, worldsize;
int provided;
MPI_Init_thread(&argc, &argv, MPI_THREAD_SERIALIZED, &provided);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &worldsize);
printf("Hello from rank %d ( / %d processes)\n", rank, worldsize);
MPI_Barrier(MPI_COMM_WORLD);
pthread_t thread;
pthread_create(&thread, NULL, thread_fun, NULL);
int v;
if (rank == 0)
{
v = 23;
MPI_Send(&v, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
}
else
{
MPI_Recv(&v, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
printf("[%d] received %d (expected %d)\n", rank, v, 23);
}
pthread_join(thread, NULL);
MPI_Finalize();
return EXIT_SUCCESS;
}
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