shmem_barrier_all(3) — Chainguard OS Manuals

SHMEM_BARRIER_ALL(3)

Open MPI

SHMEM_BARRIER_ALL(3)

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 <#shmem-put32>(3).

EXAMPLES

setup_data()
{


  if (shmem_my_pe() == 0) {


    setup();


  }


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


  shmem_barrier_all();
}

See also:

shmem_barrier(3) shmem_init(3)

Copyright

2003-2026, The Open MPI Community

October 30, 2026