2 * C11 <threads.h> emulation library
4 * (C) Copyright yohhoy 2012.
5 * Distributed under the Boost Software License, Version 1.0.
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37 #include <stdint.h> /* for intptr_t */
42 EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
43 Use pthread_mutex_timedlock() for `mtx_timedlock()'
44 Otherwise use mtx_trylock() + *busy loop* emulation.
46 #if !defined(__CYGWIN__) && !defined(__APPLE__) && !defined(__NetBSD__)
47 #define EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
53 /*---------------------------- macros ----------------------------*/
54 #define ONCE_FLAG_INIT PTHREAD_ONCE_INIT
55 #ifdef INIT_ONCE_STATIC_INIT
56 #define TSS_DTOR_ITERATIONS PTHREAD_DESTRUCTOR_ITERATIONS
58 #define TSS_DTOR_ITERATIONS 1 // assume TSS dtor MAY be called at least once.
61 // FIXME: temporary non-standard hack to ease transition
62 #define _MTX_INITIALIZER_NP PTHREAD_MUTEX_INITIALIZER
64 /*---------------------------- types ----------------------------*/
65 typedef pthread_cond_t cnd_t
;
66 typedef pthread_t thrd_t
;
67 typedef pthread_key_t tss_t
;
68 typedef pthread_mutex_t mtx_t
;
69 typedef pthread_once_t once_flag
;
73 Implementation limits:
74 - Conditionally emulation for "mutex with timeout"
75 (see EMULATED_THREADS_USE_NATIVE_TIMEDLOCK macro)
77 struct impl_thrd_param
{
83 impl_thrd_routine(void *p
)
85 struct impl_thrd_param pack
= *((struct impl_thrd_param
*)p
);
87 return (void*)(intptr_t)pack
.func(pack
.arg
);
91 /*--------------- 7.25.2 Initialization functions ---------------*/
94 call_once(once_flag
*flag
, void (*func
)(void))
96 pthread_once(flag
, func
);
100 /*------------- 7.25.3 Condition variable functions -------------*/
103 cnd_broadcast(cnd_t
*cond
)
105 if (!cond
) return thrd_error
;
106 pthread_cond_broadcast(cond
);
112 cnd_destroy(cnd_t
*cond
)
115 pthread_cond_destroy(cond
);
120 cnd_init(cnd_t
*cond
)
122 if (!cond
) return thrd_error
;
123 pthread_cond_init(cond
, NULL
);
129 cnd_signal(cnd_t
*cond
)
131 if (!cond
) return thrd_error
;
132 pthread_cond_signal(cond
);
138 cnd_timedwait(cnd_t
*cond
, mtx_t
*mtx
, const xtime
*xt
)
140 struct timespec abs_time
;
142 if (!cond
|| !mtx
|| !xt
) return thrd_error
;
143 rt
= pthread_cond_timedwait(cond
, mtx
, &abs_time
);
146 return (rt
== 0) ? thrd_success
: thrd_error
;
151 cnd_wait(cnd_t
*cond
, mtx_t
*mtx
)
153 if (!cond
|| !mtx
) return thrd_error
;
154 pthread_cond_wait(cond
, mtx
);
159 /*-------------------- 7.25.4 Mutex functions --------------------*/
162 mtx_destroy(mtx_t
*mtx
)
165 pthread_mutex_destroy(mtx
);
170 mtx_init(mtx_t
*mtx
, int type
)
172 pthread_mutexattr_t attr
;
173 if (!mtx
) return thrd_error
;
174 if (type
!= mtx_plain
&& type
!= mtx_timed
&& type
!= mtx_try
175 && type
!= (mtx_plain
|mtx_recursive
)
176 && type
!= (mtx_timed
|mtx_recursive
)
177 && type
!= (mtx_try
|mtx_recursive
))
179 pthread_mutexattr_init(&attr
);
180 if ((type
& mtx_recursive
) != 0)
181 pthread_mutexattr_settype(&attr
, PTHREAD_MUTEX_RECURSIVE
);
182 pthread_mutex_init(mtx
, &attr
);
183 pthread_mutexattr_destroy(&attr
);
191 if (!mtx
) return thrd_error
;
192 pthread_mutex_lock(mtx
);
197 mtx_trylock(mtx_t
*mtx
);
204 mtx_timedlock(mtx_t
*mtx
, const xtime
*xt
)
206 if (!mtx
|| !xt
) return thrd_error
;
208 #ifdef EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
212 ts
.tv_nsec
= xt
->nsec
;
213 rt
= pthread_mutex_timedlock(mtx
, &ts
);
216 return (rt
== ETIMEDOUT
) ? thrd_busy
: thrd_error
;
218 time_t expire
= time(NULL
);
220 while (mtx_trylock(mtx
) != thrd_success
) {
221 time_t now
= time(NULL
);
234 mtx_trylock(mtx_t
*mtx
)
236 if (!mtx
) return thrd_error
;
237 return (pthread_mutex_trylock(mtx
) == 0) ? thrd_success
: thrd_busy
;
242 mtx_unlock(mtx_t
*mtx
)
244 if (!mtx
) return thrd_error
;
245 pthread_mutex_unlock(mtx
);
250 /*------------------- 7.25.5 Thread functions -------------------*/
253 thrd_create(thrd_t
*thr
, thrd_start_t func
, void *arg
)
255 struct impl_thrd_param
*pack
;
256 if (!thr
) return thrd_error
;
257 pack
= (struct impl_thrd_param
*)malloc(sizeof(struct impl_thrd_param
));
258 if (!pack
) return thrd_nomem
;
261 if (pthread_create(thr
, NULL
, impl_thrd_routine
, pack
) != 0) {
272 return pthread_self();
277 thrd_detach(thrd_t thr
)
279 return (pthread_detach(thr
) == 0) ? thrd_success
: thrd_error
;
284 thrd_equal(thrd_t thr0
, thrd_t thr1
)
286 return pthread_equal(thr0
, thr1
);
293 pthread_exit((void*)(intptr_t)res
);
298 thrd_join(thrd_t thr
, int *res
)
301 if (pthread_join(thr
, &code
) != 0)
304 *res
= (int)(intptr_t)code
;
310 thrd_sleep(const xtime
*xt
)
314 req
.tv_sec
= xt
->sec
;
315 req
.tv_nsec
= xt
->nsec
;
316 nanosleep(&req
, NULL
);
327 /*----------- 7.25.6 Thread-specific storage functions -----------*/
330 tss_create(tss_t
*key
, tss_dtor_t dtor
)
332 if (!key
) return thrd_error
;
333 return (pthread_key_create(key
, dtor
) == 0) ? thrd_success
: thrd_error
;
338 tss_delete(tss_t key
)
340 pthread_key_delete(key
);
347 return pthread_getspecific(key
);
352 tss_set(tss_t key
, void *val
)
354 return (pthread_setspecific(key
, val
) == 0) ? thrd_success
: thrd_error
;
358 /*-------------------- 7.25.7 Time functions --------------------*/
361 xtime_get(xtime
*xt
, int base
)
364 if (base
== TIME_UTC
) {
365 xt
->sec
= time(NULL
);