cnd_wait

 

C

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Atomic operations (C11)

Thread support (C11)

Technical Specifications

 

Thread 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
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 <threads.h>
int cnd_wait( cnd_t* cond, mtx_t* mutex );		(since C11)

Atomically unlocks the mutex pointed to by mutex and blocks on the condition variable pointed to by cond until the thread is signalled by cnd_signal or cnd_broadcast, or until a spurious wake-up occurs. The mutex is locked again before the function returns.

The behavior is undefined if the mutex is not already locked by the calling thread.

Parameters

cond	-	pointer to the condition variable to block on
mutex	-	pointer to the mutex to unlock for the duration of the block

Return value

thrd_success if successful, thrd_error otherwise.

References

• C11 standard (ISO/IEC 9899:2011):

• 7.26.3.6 The cnd_wait function (p: 380)

See also

cnd_timedwait (C11)	blocks on a condition variable, with a timeout (function)
C++ documentation for condition_variable::wait
C++ documentation for condition_variable_any::wait