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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../c/header/threads.html below:

Standard library header <threads.h>Â (C11)

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

[edit] Threads [edit] Mutual exclusion [edit] Condition variables [edit] Thread-local storage 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] function pointer type void(*)(void*), used for TSS destructor
(typedef) [edit] creates thread-specific storage pointer with a given destructor
(function) [edit] reads from thread-specific storage
(function) [edit] 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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