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