19.2.14. shmem_barrier_all — Open MPI 5.0.2 documentation

# 19.2.14. shmem_barrier_all

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

## 19.2.14.1. SYNOPSIS

C or C++:

    #include <mpp/shmem.h>

    void shmem_barrier_all(void)

Fortran:

    include 'mpp/shmem.h'

    CALL SHMEM_BARRIER_ALL

## 19.2.14.2. 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).

## 19.2.14.3. 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)