ATOMIC_FLAG_INIT

 

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Concurrency support library

Threads thrd_create thrd_equal thrd_current    thrd_sleep thrd_yield thrd_exit thrd_detach thrd_join thrd_successthrd_timedoutthrd_busythrd_nomemthrd_error    Atomic operations atomic_init ATOMIC_VAR_INIT (until C23) ATOMIC_***_LOCK_FREE atomic_is_lock_free atomic_store atomic_load atomic_exchange atomic_compare_exchange atomic_fetch_add atomic_fetch_sub atomic_fetch_or atomic_fetch_xor atomic_fetch_and

Atomic flags atomic_flag ATOMIC_FLAG_INIT atomic_flag_test_and_set atomic_flag_clear Memory ordering memory_order kill_dependency atomic_thread_fence atomic_signal_fence Mutual exclusion mtx_init mtx_lock mtx_timedlock mtx_trylock call_once mtx_unlock mtx_destroy mtx_plainmtx_recursivemtx_timed Condition variables cnd_init cnd_signal cnd_broadcast cnd_wait cnd_timedwait cnd_destroy Thread-local storage thread_local TSS_DTOR_ITERATIONS    tss_create tss_get tss_set tss_delete

 

Defined in header <stdatomic.h>
#define ATOMIC_FLAG_INIT /* unspecified */		(since C11)

Expands to an initializer that can be used to initialize atomic_flag type to the clear state. The value of an atomic_flag that is not initialized using this macro is indeterminate.

Example

#include <stdatomic.h>
 
atomic_flag flag = ATOMIC_FLAG_INIT;

References

• C17 standard (ISO/IEC 9899:2018):

• 7.17.1/3 ATOMIC_FLAG_INIT (p: 200)

• 7.17.8/4 ATOMIC_FLAG_INIT (p: 208)

• C11 standard (ISO/IEC 9899:2011):

• 7.17.1/3 ATOMIC_FLAG_INIT (p: 273)

• 7.17.8/4 ATOMIC_FLAG_INIT (p: 285)

See also

ATOMIC_VAR_INIT (C11)(deprecated in C17)(removed in C23)	initializes a new atomic object (function macro)
atomic_flag (C11)	lock-free atomic boolean flag (struct)
C++ documentation for ATOMIC_FLAG_INIT