#define RELEASE_TAG 2
int main(int argc, char **argv){
-
- int err, size, rank;
+ int size;
+ int rank;
int recv_buff;
MPI_Status status;
- int CS_used = 0;
xbt_dynar_t requests = xbt_dynar_new(sizeof(int), NULL);
-
+
/* Initialize MPI */
- err = MPI_Init(&argc, &argv);
+ int err = MPI_Init(&argc, &argv);
if(err != MPI_SUCCESS){
printf("MPI initialization failed !\n");
exit(1);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if(rank == 0){ /* Coordinator */
+ int CS_used = 0;
while(1){
MPI_Recv(&recv_buff, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
if(status.MPI_TAG == REQUEST_TAG){
}
}else{
if(!xbt_dynar_is_empty(requests)){
- printf("CS release. Grant to queued requests (queue size: %lu)",
- xbt_dynar_length(requests));
+ printf("CS release. Grant to queued requests (queue size: %lu)", xbt_dynar_length(requests));
xbt_dynar_shift(requests, &recv_buff);
MPI_Send(&rank, 1, MPI_INT, recv_buff, GRANT_TAG, MPI_COMM_WORLD);
CS_used = 1;
while(1){
printf("%d asks the request.\n", rank);
MPI_Send(&rank, 1, MPI_INT, 0, REQUEST_TAG, MPI_COMM_WORLD);
-
+
MPI_Recv(&recv_buff, 1, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
-
+
printf("%d got the answer. Release it.\n", rank);
MPI_Send(&rank, 1, MPI_INT, 0, RELEASE_TAG, MPI_COMM_WORLD);
-
}
}