mirror of https://github.com/mpv-player/mpv
253 lines
8.0 KiB
C
253 lines
8.0 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include "common/common.h"
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#include "config.h"
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// We make use of NON-POSIX pthreads functions and certain systems
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// require this header to build without issues. (ex: OpenBSD)
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#if HAVE_BSD_THREAD_NAME
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#include <pthread_np.h>
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#endif
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#include "osdep/compiler.h"
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#include "timer.h"
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int mp_ptwrap_check(const char *file, int line, int res);
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int mp_ptwrap_mutex_init(const char *file, int line, pthread_mutex_t *m,
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const pthread_mutexattr_t *attr);
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int mp_ptwrap_mutex_trylock(const char *file, int line, pthread_mutex_t *m);
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#if HAVE_PTHREAD_DEBUG
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// pthread debugging wrappers. Technically, this is undefined behavior, because
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// you are not supposed to define any symbols that clash with reserved names.
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// Other than that, they should be fine.
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// Note: mpv normally never checks pthread error return values of certain
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// functions that should never fail. It does so because these cases would
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// be undefined behavior anyway (such as double-frees etc.). However,
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// since there are no good pthread debugging tools, these wrappers are
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// provided for the sake of debugging. They crash on unexpected errors.
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//
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// Technically, pthread_cond/mutex_init() can fail with ENOMEM. We don't
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// really respect this for normal/recursive mutex types, as due to the
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// existence of static initializers, no sane implementation could actually
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// require allocating memory.
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#define MP_PTWRAP(fn, ...) \
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mp_ptwrap_check(__FILE__, __LINE__, (fn)(__VA_ARGS__))
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// ISO C defines that all standard functions can be macros, except undef'ing
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// them is allowed and must make the "real" definitions available. (Whatever.)
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#undef pthread_cond_init
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#undef pthread_cond_destroy
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#undef pthread_cond_broadcast
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#undef pthread_cond_signal
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#undef pthread_cond_wait
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#undef pthread_cond_timedwait
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#undef pthread_detach
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#undef pthread_join
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#undef pthread_mutex_destroy
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#undef pthread_mutex_lock
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#undef pthread_mutex_trylock
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#undef pthread_mutex_unlock
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#define pthread_cond_init(...) MP_PTWRAP(pthread_cond_init, __VA_ARGS__)
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#define pthread_cond_destroy(...) MP_PTWRAP(pthread_cond_destroy, __VA_ARGS__)
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#define pthread_cond_broadcast(...) MP_PTWRAP(pthread_cond_broadcast, __VA_ARGS__)
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#define pthread_cond_signal(...) MP_PTWRAP(pthread_cond_signal, __VA_ARGS__)
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#define pthread_cond_wait(...) MP_PTWRAP(pthread_cond_wait, __VA_ARGS__)
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#define pthread_cond_timedwait(...) MP_PTWRAP(pthread_cond_timedwait, __VA_ARGS__)
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#define pthread_detach(...) MP_PTWRAP(pthread_detach, __VA_ARGS__)
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#define pthread_join(...) MP_PTWRAP(pthread_join, __VA_ARGS__)
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#define pthread_mutex_destroy(...) MP_PTWRAP(pthread_mutex_destroy, __VA_ARGS__)
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#define pthread_mutex_lock(...) MP_PTWRAP(pthread_mutex_lock, __VA_ARGS__)
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#define pthread_mutex_unlock(...) MP_PTWRAP(pthread_mutex_unlock, __VA_ARGS__)
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#define pthread_mutex_init(...) \
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mp_ptwrap_mutex_init(__FILE__, __LINE__, __VA_ARGS__)
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#define pthread_mutex_trylock(...) \
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mp_ptwrap_mutex_trylock(__FILE__, __LINE__, __VA_ARGS__)
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#endif
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typedef struct {
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pthread_cond_t cond;
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clockid_t clk_id;
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} mp_cond;
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typedef pthread_mutex_t mp_mutex;
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typedef pthread_mutex_t mp_static_mutex;
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typedef pthread_once_t mp_once;
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typedef pthread_t mp_thread_id;
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typedef pthread_t mp_thread;
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#define MP_STATIC_COND_INITIALIZER { .cond = PTHREAD_COND_INITIALIZER, .clk_id = CLOCK_REALTIME }
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#define MP_STATIC_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
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#define MP_STATIC_ONCE_INITIALIZER PTHREAD_ONCE_INIT
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static inline int mp_mutex_init_type_internal(mp_mutex *mutex, enum mp_mutex_type mtype)
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{
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int mutex_type;
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switch (mtype) {
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case MP_MUTEX_RECURSIVE:
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mutex_type = PTHREAD_MUTEX_RECURSIVE;
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break;
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case MP_MUTEX_NORMAL:
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default:
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#ifndef NDEBUG
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mutex_type = PTHREAD_MUTEX_ERRORCHECK;
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#else
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mutex_type = PTHREAD_MUTEX_DEFAULT;
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#endif
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break;
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}
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int ret = 0;
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pthread_mutexattr_t attr;
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ret = pthread_mutexattr_init(&attr);
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if (ret != 0)
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return ret;
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pthread_mutexattr_settype(&attr, mutex_type);
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ret = pthread_mutex_init(mutex, &attr);
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pthread_mutexattr_destroy(&attr);
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assert(!ret);
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return ret;
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}
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#define mp_mutex_destroy pthread_mutex_destroy
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#define mp_mutex_lock pthread_mutex_lock
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#define mp_mutex_trylock pthread_mutex_trylock
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#define mp_mutex_unlock pthread_mutex_unlock
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static inline int mp_cond_init(mp_cond *cond)
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{
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assert(cond);
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int ret = 0;
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pthread_condattr_t attr;
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ret = pthread_condattr_init(&attr);
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if (ret)
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return ret;
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cond->clk_id = CLOCK_REALTIME;
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#if HAVE_PTHREAD_CONDATTR_SETCLOCK
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if (!pthread_condattr_setclock(&attr, CLOCK_MONOTONIC))
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cond->clk_id = CLOCK_MONOTONIC;
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#endif
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ret = pthread_cond_init(&cond->cond, &attr);
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pthread_condattr_destroy(&attr);
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return ret;
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}
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static inline int mp_cond_destroy(mp_cond *cond)
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{
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assert(cond);
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return pthread_cond_destroy(&cond->cond);
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}
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static inline int mp_cond_broadcast(mp_cond *cond)
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{
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assert(cond);
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return pthread_cond_broadcast(&cond->cond);
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}
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static inline int mp_cond_signal(mp_cond *cond)
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{
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assert(cond);
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return pthread_cond_signal(&cond->cond);
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}
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static inline int mp_cond_wait(mp_cond *cond, mp_mutex *mutex)
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{
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assert(cond);
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return pthread_cond_wait(&cond->cond, mutex);
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}
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static inline int mp_cond_timedwait(mp_cond *cond, mp_mutex *mutex, int64_t timeout)
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{
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assert(cond);
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timeout = MPMAX(0, timeout);
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// consider anything above 1000 days as infinity
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if (timeout > MP_TIME_S_TO_NS(1000 * 24 * 60 * 60))
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return pthread_cond_wait(&cond->cond, mutex);
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struct timespec ts;
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clock_gettime(cond->clk_id, &ts);
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ts.tv_sec += timeout / MP_TIME_S_TO_NS(1);
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ts.tv_nsec += timeout % MP_TIME_S_TO_NS(1);
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if (ts.tv_nsec >= MP_TIME_S_TO_NS(1)) {
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ts.tv_nsec -= MP_TIME_S_TO_NS(1);
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ts.tv_sec++;
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}
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return pthread_cond_timedwait(&cond->cond, mutex, &ts);
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}
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static inline int mp_cond_timedwait_until(mp_cond *cond, mp_mutex *mutex, int64_t until)
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{
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return mp_cond_timedwait(cond, mutex, until - mp_time_ns());
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}
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#define mp_exec_once pthread_once
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#define MP_THREAD_VOID void *
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#define MP_THREAD_RETURN() return NULL
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#define mp_thread_create(t, f, a) pthread_create(t, NULL, f, a)
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#define mp_thread_join(t) pthread_join(t, NULL)
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#define mp_thread_join_id(t) pthread_join(t, NULL)
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#define mp_thread_detach pthread_detach
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#define mp_thread_current_id pthread_self
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#define mp_thread_id_equal(a, b) ((a) == (b))
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#define mp_thread_get_id(thread) (thread)
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static inline void mp_thread_set_name(const char *name)
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{
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#if HAVE_GLIBC_THREAD_NAME
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if (pthread_setname_np(pthread_self(), name) == ERANGE) {
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char tname[16] = {0}; // glibc-checked kernel limit
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strncpy(tname, name, sizeof(tname) - 1);
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pthread_setname_np(pthread_self(), tname);
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}
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#elif HAVE_BSD_THREAD_NAME
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pthread_set_name_np(pthread_self(), name);
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#elif HAVE_MAC_THREAD_NAME
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pthread_setname_np(name);
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#endif
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}
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static inline int64_t mp_thread_cpu_time_ns(mp_thread_id thread)
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{
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#if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && defined(_POSIX_THREAD_CPUTIME)
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clockid_t id;
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struct timespec ts;
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if (pthread_getcpuclockid(thread, &id) == 0 && clock_gettime(id, &ts) == 0)
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return MP_TIME_S_TO_NS(ts.tv_sec) + ts.tv_nsec;
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#endif
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return 0;
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}
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