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/GNU Fortran 7

8.2.24 _gfortran_caf_sync_memory — Wait for completion of segment-memory operations

Description:

Acts as optimization barrier between different segments. It also ensures that all pending memory operations of this image have been completed.

Syntax:

void _gfortran_caf_sync_memory (int *stat, char *errmsg, int errmsg_len)

Arguments:
stat intent(out) Stores the status STAT= and may be NULL.
errmsg intent(out) When an error occurs, this will be set to an error message; may be NULL.
errmsg_len intent(in) the buffer size of errmsg
NOTE A simple implementation could be

__asm__ __volatile__ ("":::"memory") to prevent code movements.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/_005fgfortran_005fcaf_005fsync_005fmemory.html