thrd_create

 

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Concurrency support (C11)

Technical Specifications

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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 <threads.h>
int thrd_create( thrd_t *thr, thrd_start_t func, void *arg );		(since C11)

Creates a new thread executing the function func. The function is invoked as func(arg).

If successful, the object pointed to by thr is set to the identifier of the new thread.

The completion of this function synchronizes-with the beginning of the thread.

Parameters

thr	-	pointer to memory location to put the identifier of the new thread
func	-	function to execute
arg	-	argument to pass to the function

Return value

thrd_success if the creation of the new thread was successful. Otherwise returns thrd_nomem if there was insufficient amount of memory or thrd_error if another error occurred.

Notes

The thread identifiers may be reused for new threads once the thread has finished and joined or detached.

The type thrd_start_t is a typedef of int(*)(void*), which differs from the POSIX equivalent void*(*)(void*)

All thread-specific storage values (see tss_create) are initialized to NULL.

Return from the function func is equivalent to calling thrd_exit with the argument equal to the return value of func.

References

• C17 standard (ISO/IEC 9899:2018):

• 7.26.5.1 The thrd_create function (p: 279)

• C11 standard (ISO/IEC 9899:2011):

• 7.26.5.1 The thrd_create function (p: 383)

See also

thrd_detach (C11)	detaches a thread (function)
thrd_join (C11)	blocks until a thread terminates (function)
C++ documentation for thread