I/O in the SPMD Framework

Collaboration diagram for I/O in the SPMD Framework:

BSPlib's SPMD framework sets specific rules on I/O. It is guaranteed to always work on process 0. Other processes can only write to standard output and standard error. This output is multiplexed in a non-deterministic fashion.

#include <bsp.h>
 
int main(int argc, char ** argv)
{
    int pid, number;
    bsp_begin( bsp_nprocs() );
 
    pid = bsp_pid();
    if ( 0 == pid )
    {
        printf("Hi, type a number:\n");
        scanf("%d", & number);
    }
    bsp_sync();
    if ( 0 == pid )
    {
        printf("Hi, I am root and I have your number %d\n", number);
    }
    else
    {
        printf( "Hi, I from process %d\n", pid );
    }
 
    bsp_end();
    return 0;
}