thrd_exit

 

C

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Concurrency support (C11)

Technical Specifications

Symbol index

 

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 <threads.h>
_Noreturn void thrd_exit( int res );		(since C11)

First, for every thread-specific storage key which was created with a non-null destructor and for which the associated value is non-null (see tss_create), thrd_exit sets the value associated with the key to NULL and then invokes the destructor with the previous value of the key. The order in which the destructors are invoked is unspecified.

If, after this, there remain keys with both non-null destructors and values (e.g. if a destructor executed tss_set), the process is repeated up to TSS_DTOR_ITERATIONS times.

FInally, the thrd_exit function terminates execution of the calling thread and sets its result code to res.

If the last thread in the program is terminated with thrd_exit, the entire program terminates as if by calling exit with EXIT_SUCCESS as the argument (so the functions registered by atexit are executed in the context of that last thread)

Parameters

res

-

the result value to return

Return value

(none)

References

• C17 standard (ISO/IEC 9899:2018):

• 7.26.5.5 The thrd_exit function (p: 280)

• C11 standard (ISO/IEC 9899:2011):

• 7.26.5.5 The thrd_exit function (p: 384)

See also

thrd_join (C11)	blocks until a thread terminates (function)
thrd_detach (C11)	detaches a thread (function)