shmem_barrier_all.openmpi(3)

Suspends the execution of the calling PE until all other PEs issue a call

Section 3 openmpi-doc bookworm source

Description

SHMEM_BARRIER_ALL

NAME

shmem_barrier_all - Suspends the execution of the calling PE until all other PEs issue a call to this particular shmem_barrier_all() statement.

SYNOPSIS

C or C++:
#include <mpp/shmem.h>

void shmem_barrier_all(void);

Fortran:
include ’mpp/shmem.h’

CALL SHMEM_BARRIER_ALL

DESCRIPTION

The shmem_barrier_all routine does not return until all other PEs have entered this routine at the same point of the execution path.

Prior to synchronizing with other PEs, shmem_barrier_all ensures completion of all previously issued local memory stores and remote memory updates issued via SHMEM functions such as shmem_put32(3).

EXAMPLES

setup_data()
{
if (shmem_my_pe() == 0) {
setup();
}

/* All PEs wait for PE 0 to complete setup(). */
shmem_barrier_all();
}