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8.2.17 _gfortran_caf_sync_memory — Wait for completion of segment-memory operations

Acts as optimization barrier between different segments. It also ensures that all pending memory operations of this image have been completed.
void _gfortran_caf_sync_memory (int *stat, char *errmsg, int errmsg_len)

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 the buffer size of errmsg.

NOTE A simple implementation could be
__asm__ __volatile__ ("":::"memory") to prevent code movements.