< c‎ | atomic
Defined in header <stdatomic.h>
void atomic_signal_fence( memory_order order );
(since C11)

Establishes memory synchronization ordering of non-atomic and relaxed atomic accesses, as instructed by order, between a thread and a signal handler executed on the same thread. This is equivalent to atomic_thread_fence, except no CPU instructions for memory ordering are issued. Only reordering of the instructions by the compiler is suppressed as order instructs. For example, a fence with release semantics prevents reads or writes from being moved past subsequent writes and a fence with acquire semantics prevents reads or writes from being moved ahead of preceding reads.


order - the memory ordering executed by this fence

Return value



  • C11 standard (ISO/IEC 9899:2011):
  • The atomic_signal_fence function (p: 279)

See also

generic memory order-dependent fence synchronization primitive
C++ documentation for atomic_signal_fence