c11: Import threads.h emulation library.
Implementation is based of https://gist.github.com/2223710 with the following modifications: - inline implementatation - retain XP compatability - add temporary hack for static mutex initializers (as they are not part of the stack but still widely used internally) - make TIME_UTC a conditional macro (some system headers already define it, so this prevents conflict) - respect HAVE_PTHREAD macro Reviewed-by: Brian Paul <brianp@vmware.com> Acked-by: Ian Romanick <ian.d.romanick@intel.com> Acked-by: Chad Versace <chad.versace@linux.intel.com>
This commit is contained in:
José Fonseca
346
include/c11/threads_posix.h
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346
include/c11/threads_posix.h
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/*
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* C11 <threads.h> emulation library
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*
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* (C) Copyright yohhoy 2012.
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* Distributed under the Boost Software License, Version 1.0.
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* (See copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#include <stdlib.h>
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#include <assert.h>
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#include <limits.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sched.h>
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#include <stdint.h> /* for intptr_t */
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/*
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Configuration macro:
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EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
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Use pthread_mutex_timedlock() for `mtx_timedlock()'
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Otherwise use mtx_trylock() + *busy loop* emulation.
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*/
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#if !defined(__CYGWIN__)
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#define EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
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#endif
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#include <pthread.h>
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/*---------------------------- macros ----------------------------*/
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#define ONCE_FLAG_INIT PTHREAD_ONCE_INIT
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#ifdef INIT_ONCE_STATIC_INIT
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#define TSS_DTOR_ITERATIONS PTHREAD_DESTRUCTOR_ITERATIONS
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#else
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#define TSS_DTOR_ITERATIONS 1 // assume TSS dtor MAY be called at least once.
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#endif
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// FIXME: temporary non-standard hack to ease transition
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#define _MTX_INITIALIZER_NP PTHREAD_MUTEX_INITIALIZER
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/*---------------------------- types ----------------------------*/
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typedef pthread_cond_t cnd_t;
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typedef pthread_t thrd_t;
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typedef pthread_key_t tss_t;
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typedef pthread_mutex_t mtx_t;
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typedef pthread_once_t once_flag;
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/*
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Implementation limits:
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- Conditionally emulation for "mutex with timeout"
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(see EMULATED_THREADS_USE_NATIVE_TIMEDLOCK macro)
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*/
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struct impl_thrd_param {
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thrd_start_t func;
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void *arg;
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};
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static inline void *
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impl_thrd_routine(void *p)
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{
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struct impl_thrd_param pack = *((struct impl_thrd_param *)p);
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free(p);
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return (void*)(intptr_t)pack.func(pack.arg);
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}
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/*--------------- 7.25.2 Initialization functions ---------------*/
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// 7.25.2.1
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static inline void
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call_once(once_flag *flag, void (*func)(void))
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{
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pthread_once(flag, func);
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}
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/*------------- 7.25.3 Condition variable functions -------------*/
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// 7.25.3.1
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static inline int
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cnd_broadcast(cnd_t *cond)
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{
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if (!cond) return thrd_error;
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pthread_cond_broadcast(cond);
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return thrd_success;
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}
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// 7.25.3.2
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static inline void
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cnd_destroy(cnd_t *cond)
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{
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assert(cond);
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pthread_cond_destroy(cond);
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}
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// 7.25.3.3
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static inline int
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cnd_init(cnd_t *cond)
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{
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if (!cond) return thrd_error;
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pthread_cond_init(cond, NULL);
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return thrd_success;
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}
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// 7.25.3.4
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static inline int
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cnd_signal(cnd_t *cond)
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{
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if (!cond) return thrd_error;
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pthread_cond_signal(cond);
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return thrd_success;
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}
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// 7.25.3.5
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static inline int
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cnd_timedwait(cnd_t *cond, mtx_t *mtx, const xtime *xt)
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{
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struct timespec abs_time;
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int rt;
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if (!cond || !mtx || !xt) return thrd_error;
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rt = pthread_cond_timedwait(cond, mtx, &abs_time);
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if (rt == ETIMEDOUT)
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return thrd_busy;
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return (rt == 0) ? thrd_success : thrd_error;
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}
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// 7.25.3.6
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static inline int
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cnd_wait(cnd_t *cond, mtx_t *mtx)
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{
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if (!cond || !mtx) return thrd_error;
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pthread_cond_wait(cond, mtx);
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return thrd_success;
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}
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/*-------------------- 7.25.4 Mutex functions --------------------*/
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// 7.25.4.1
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static inline void
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mtx_destroy(mtx_t *mtx)
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{
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assert(mtx);
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pthread_mutex_destroy(mtx);
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}
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// 7.25.4.2
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static inline int
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mtx_init(mtx_t *mtx, int type)
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{
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pthread_mutexattr_t attr;
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if (!mtx) return thrd_error;
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if (type != mtx_plain && type != mtx_timed && type != mtx_try
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&& type != (mtx_plain|mtx_recursive)
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&& type != (mtx_timed|mtx_recursive)
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&& type != (mtx_try|mtx_recursive))
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return thrd_error;
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pthread_mutexattr_init(&attr);
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if ((type & mtx_recursive) != 0) {
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#if defined(__linux__) || defined(__linux)
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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#else
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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#endif
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}
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pthread_mutex_init(mtx, &attr);
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pthread_mutexattr_destroy(&attr);
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return thrd_success;
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}
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// 7.25.4.3
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static inline int
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mtx_lock(mtx_t *mtx)
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{
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if (!mtx) return thrd_error;
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pthread_mutex_lock(mtx);
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return thrd_success;
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}
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// 7.25.4.4
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static inline int
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mtx_timedlock(mtx_t *mtx, const xtime *xt)
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{
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if (!mtx || !xt) return thrd_error;
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{
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#ifdef EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
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struct timespec ts;
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int rt;
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ts.tv_sec = xt->sec;
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ts.tv_nsec = xt->nsec;
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rt = pthread_mutex_timedlock(mtx, &ts);
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if (rt == 0)
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return thrd_success;
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return (rt == ETIMEDOUT) ? thrd_busy : thrd_error;
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#else
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time_t expire = time(NULL);
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expire += xt->sec;
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while (mtx_trylock(mtx) != thrd_success) {
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time_t now = time(NULL);
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if (expire < now)
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return thrd_busy;
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// busy loop!
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thrd_yield();
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}
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return thrd_success;
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#endif
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}
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}
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// 7.25.4.5
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static inline int
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mtx_trylock(mtx_t *mtx)
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{
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if (!mtx) return thrd_error;
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return (pthread_mutex_trylock(mtx) == 0) ? thrd_success : thrd_busy;
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}
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// 7.25.4.6
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static inline int
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mtx_unlock(mtx_t *mtx)
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{
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if (!mtx) return thrd_error;
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pthread_mutex_unlock(mtx);
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return thrd_success;
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}
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/*------------------- 7.25.5 Thread functions -------------------*/
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// 7.25.5.1
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static inline int
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thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
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{
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struct impl_thrd_param *pack;
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if (!thr) return thrd_error;
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pack = (struct impl_thrd_param *)malloc(sizeof(struct impl_thrd_param));
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if (!pack) return thrd_nomem;
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pack->func = func;
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pack->arg = arg;
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if (pthread_create(thr, NULL, impl_thrd_routine, pack) != 0) {
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free(pack);
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return thrd_error;
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}
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return thrd_success;
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}
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// 7.25.5.2
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static inline thrd_t
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thrd_current(void)
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{
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return pthread_self();
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}
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// 7.25.5.3
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static inline int
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thrd_detach(thrd_t thr)
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{
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return (pthread_detach(thr) == 0) ? thrd_success : thrd_error;
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}
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// 7.25.5.4
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static inline int
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thrd_equal(thrd_t thr0, thrd_t thr1)
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{
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return pthread_equal(thr0, thr1);
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}
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// 7.25.5.5
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static inline void
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thrd_exit(int res)
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{
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pthread_exit((void*)(intptr_t)res);
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}
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// 7.25.5.6
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static inline int
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thrd_join(thrd_t thr, int *res)
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{
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void *code;
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if (pthread_join(thr, &code) != 0)
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return thrd_error;
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if (res)
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*res = (int)(intptr_t)code;
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return thrd_success;
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}
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// 7.25.5.7
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static inline void
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thrd_sleep(const xtime *xt)
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{
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struct timespec req;
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assert(xt);
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req.tv_sec = xt->sec;
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req.tv_nsec = xt->nsec;
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nanosleep(&req, NULL);
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}
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// 7.25.5.8
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static inline void
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thrd_yield(void)
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{
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sched_yield();
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}
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/*----------- 7.25.6 Thread-specific storage functions -----------*/
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// 7.25.6.1
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static inline int
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tss_create(tss_t *key, tss_dtor_t dtor)
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{
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if (!key) return thrd_error;
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return (pthread_key_create(key, dtor) == 0) ? thrd_success : thrd_error;
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}
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// 7.25.6.2
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static inline void
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tss_delete(tss_t key)
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{
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pthread_key_delete(key);
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}
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// 7.25.6.3
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static inline void *
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tss_get(tss_t key)
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{
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return pthread_getspecific(key);
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}
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// 7.25.6.4
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static inline int
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tss_set(tss_t key, void *val)
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{
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return (pthread_setspecific(key, val) == 0) ? thrd_success : thrd_error;
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}
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/*-------------------- 7.25.7 Time functions --------------------*/
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// 7.25.6.1
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static inline int
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xtime_get(xtime *xt, int base)
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{
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if (!xt) return 0;
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if (base == TIME_UTC) {
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xt->sec = time(NULL);
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xt->nsec = 0;
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return base;
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}
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return 0;
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}
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