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Standard library header <threads.h> (C11)

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This header is part of concurrency support library and provides support for threads, mutual exclusion, condition variables, and thread-specific storages.

[edit] Threads

thrd_t implementation-defined complete object type identifying a thread [edit]
creates a thread
(function) [edit]
checks if two identifiers refer to the same thread
(function) [edit]
obtains the current thread identifier
(function) [edit]
suspends execution of the calling thread for the given period of time
(function) [edit]
yields the current time slice
(function) [edit]
terminates the calling thread
(function) [edit]
detaches a thread
(function) [edit]
blocks until a thread terminates
(function) [edit]
indicates a thread error status
(constant) [edit]
thrd_start_t
(C11)
a typedef of the function pointer type int(*)(void*), used by thrd_create
(typedef) [edit]

[edit] Mutual exclusion

mtx_t mutex identifier [edit]
(C11)
creates a mutex
(function) [edit]
(C11)
blocks until locks a mutex
(function) [edit]
blocks until locks a mutex or times out
(function) [edit]
locks a mutex or returns without blocking if already locked
(function) [edit]
unlocks a mutex
(function) [edit]
destroys a mutex
(function) [edit]
defines the type of a mutex
(enum) [edit]
Call once
calls a function exactly once
(function) [edit]

[edit] Condition variables

cnd_t condition variable identifier
(C11)
creates a condition variable
(function) [edit]
unblocks one thread blocked on a condition variable
(function) [edit]
unblocks all threads blocked on a condition variable
(function) [edit]
(C11)
blocks on a condition variable
(function) [edit]
blocks on a condition variable, with a timeout
(function) [edit]
destroys a condition variable
(function) [edit]

[edit] Thread-local storage

(C11)(removed in C23)
convenience macro for storage-class specifier _Thread_local
(keyword macro) [edit]
tss_t thread-specific storage pointer [edit]
maximum number of times destructors are called
(macro constant) [edit]
tss_dtor_t
(C11)
function pointer type void(*)(void*), used for TSS destructor
(typedef) [edit]
creates thread-specific storage pointer with a given destructor
(function) [edit]
(C11)
reads from thread-specific storage
(function) [edit]
(C11)
write to thread-specific storage
(function) [edit]
releases the resources held by a given thread-specific pointer
(function) [edit]

[edit] Synopsis

#define __STDC_NO_THREADS__ 202311L
 
#define ONCE_FLAG_INIT /* see description */
#define TSS_DTOR_ITERATIONS /* see description */
 
typedef /* see description */ cnd_t ;
typedef /* see description */ thrd_t ;
typedef /* see description */ tss_t ;
typedef /* see description */ mtx_t ;
typedef /* see description */ tss_dtor_t ;
typedef /* see description */ thrd_start_t ;
 
#define mtx_plain /* see description */
#define mtx_recursive /* see description */
#define mtx_timed /* see description */
#define once_flag /* see description */
#define thrd_busy /* see description */
#define thrd_error /* see description */
#define thrd_nomem /* see description */
#define thrd_success /* see description */
#define thrd_timedout /* see description */
 
void call_once (once_flag * flag, void (*func)(void));
int cnd_broadcast (cnd_t * cond);
void cnd_destroy (cnd_t * cond);
int cnd_init (cnd_t * cond);
int cnd_signal (cnd_t * cond);
int cnd_timedwait (cnd_t * restrict cond, mtx_t * restrict mtx,
const struct timespec* restrict ts);
int cnd_wait (cnd_t * cond, mtx_t * mtx);
void mtx_destroy (mtx_t * mtx);
int mtx_init (mtx_t * mtx, int type);
int mtx_lock (mtx_t * mtx);
int mtx_timedlock (mtx_t * restrict mtx, const struct timespec* restrict ts);
int mtx_trylock (mtx_t * mtx);
int mtx_unlock (mtx_t * mtx);
int thrd_create (thrd_t * thr, thrd_start_t func, void* arg);
thrd_t thrd_current (void);
int thrd_detach (thrd_t thr);
int thrd_equal (thrd_t thr0, thrd_t thr1);
[[noreturn]] void thrd_exit (int res);
int thrd_join (thrd_t thr, int* res);
int thrd_sleep (const struct timespec* duration, struct timespec* remaining);
void thrd_yield (void);
int tss_create (tss_t * key, tss_dtor_t dtor);
void tss_delete (tss_t key);
void* tss_get (tss_t key);
int tss_set (tss_t key, void* val);
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