Updated: April 19, 2023 |
Fence between a thread and a signal handler executed in the same thread (C11)
#include <stdatomic.h> void atomic_signal_fence( memory_order order );
The atomic_signal_fence() function establishes a 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. Only reordering of the instructions by the compiler is suppressed as order instructs. For example, writes can't be moved past a fence with release semantics, and reads can't be moved ahead of a fence with acquire semantics.
The implementation of atomic functions may depend on the architecture. For more information, see LL/SC vs LSE atomic operations in the description in Building Embedded Systems of the cpuinfo area of the system page.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | Read the Caveats |
Signal handler | Read the Caveats |
Thread | Yes |
If this function is lock-free (see atomic_is_lock_free()), it's safe to call it from an ISR or signal handler.