| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| // |
| // Multi-threaded worker |
| // |
| // Original source: |
| // https://chromium.googlesource.com/webm/libwebp |
| |
| #ifndef AOM_THREAD_H_ |
| #define AOM_THREAD_H_ |
| |
| #include "config/aom_config.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // Set maximum decode threads to be 8 due to the limit of frame buffers |
| // and not enough semaphores in the emulation layer on windows. |
| #define MAX_DECODE_THREADS 8 |
| |
| #if CONFIG_MULTITHREAD |
| |
| #if defined(_WIN32) && !HAVE_PTHREAD_H |
| #include <errno.h> // NOLINT |
| #include <process.h> // NOLINT |
| #include <windows.h> // NOLINT |
| typedef HANDLE pthread_t; |
| typedef CRITICAL_SECTION pthread_mutex_t; |
| |
| #if _WIN32_WINNT >= 0x0600 // Windows Vista / Server 2008 or greater |
| #define USE_WINDOWS_CONDITION_VARIABLE |
| typedef CONDITION_VARIABLE pthread_cond_t; |
| #else |
| typedef struct { |
| HANDLE waiting_sem_; |
| HANDLE received_sem_; |
| HANDLE signal_event_; |
| } pthread_cond_t; |
| #endif // _WIN32_WINNT >= 0x600 |
| |
| #ifndef WINAPI_FAMILY_PARTITION |
| #define WINAPI_PARTITION_DESKTOP 1 |
| #define WINAPI_FAMILY_PARTITION(x) x |
| #endif |
| |
| #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) |
| #define USE_CREATE_THREAD |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // simplistic pthread emulation layer |
| |
| // _beginthreadex requires __stdcall |
| #define THREADFN unsigned int __stdcall |
| #define THREAD_RETURN(val) (unsigned int)((DWORD_PTR)val) |
| |
| #if _WIN32_WINNT >= 0x0501 // Windows XP or greater |
| #define WaitForSingleObject(obj, timeout) \ |
| WaitForSingleObjectEx(obj, timeout, FALSE /*bAlertable*/) |
| #endif |
| |
| static INLINE int pthread_create(pthread_t *const thread, const void *attr, |
| unsigned int(__stdcall *start)(void *), |
| void *arg) { |
| (void)attr; |
| #ifdef USE_CREATE_THREAD |
| *thread = CreateThread(NULL, /* lpThreadAttributes */ |
| 0, /* dwStackSize */ |
| start, arg, 0, /* dwStackSize */ |
| NULL); /* lpThreadId */ |
| #else |
| *thread = (pthread_t)_beginthreadex(NULL, /* void *security */ |
| 0, /* unsigned stack_size */ |
| start, arg, 0, /* unsigned initflag */ |
| NULL); /* unsigned *thrdaddr */ |
| #endif |
| if (*thread == NULL) return 1; |
| SetThreadPriority(*thread, THREAD_PRIORITY_ABOVE_NORMAL); |
| return 0; |
| } |
| |
| static INLINE int pthread_join(pthread_t thread, void **value_ptr) { |
| (void)value_ptr; |
| return (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 || |
| CloseHandle(thread) == 0); |
| } |
| |
| // Mutex |
| static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex, |
| void *mutexattr) { |
| (void)mutexattr; |
| #if _WIN32_WINNT >= 0x0600 // Windows Vista / Server 2008 or greater |
| InitializeCriticalSectionEx(mutex, 0 /*dwSpinCount*/, 0 /*Flags*/); |
| #else |
| InitializeCriticalSection(mutex); |
| #endif |
| return 0; |
| } |
| |
| static INLINE int pthread_mutex_trylock(pthread_mutex_t *const mutex) { |
| return TryEnterCriticalSection(mutex) ? 0 : EBUSY; |
| } |
| |
| static INLINE int pthread_mutex_lock(pthread_mutex_t *const mutex) { |
| EnterCriticalSection(mutex); |
| return 0; |
| } |
| |
| static INLINE int pthread_mutex_unlock(pthread_mutex_t *const mutex) { |
| LeaveCriticalSection(mutex); |
| return 0; |
| } |
| |
| static INLINE int pthread_mutex_destroy(pthread_mutex_t *const mutex) { |
| DeleteCriticalSection(mutex); |
| return 0; |
| } |
| |
| // Condition |
| static INLINE int pthread_cond_destroy(pthread_cond_t *const condition) { |
| int ok = 1; |
| #ifdef USE_WINDOWS_CONDITION_VARIABLE |
| (void)condition; |
| #else |
| ok &= (CloseHandle(condition->waiting_sem_) != 0); |
| ok &= (CloseHandle(condition->received_sem_) != 0); |
| ok &= (CloseHandle(condition->signal_event_) != 0); |
| #endif |
| return !ok; |
| } |
| |
| static INLINE int pthread_cond_init(pthread_cond_t *const condition, |
| void *cond_attr) { |
| (void)cond_attr; |
| #ifdef USE_WINDOWS_CONDITION_VARIABLE |
| InitializeConditionVariable(condition); |
| #else |
| condition->waiting_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL); |
| condition->received_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL); |
| condition->signal_event_ = CreateEvent(NULL, FALSE, FALSE, NULL); |
| if (condition->waiting_sem_ == NULL || condition->received_sem_ == NULL || |
| condition->signal_event_ == NULL) { |
| pthread_cond_destroy(condition); |
| return 1; |
| } |
| #endif |
| return 0; |
| } |
| |
| static INLINE int pthread_cond_signal(pthread_cond_t *const condition) { |
| int ok = 1; |
| #ifdef USE_WINDOWS_CONDITION_VARIABLE |
| WakeConditionVariable(condition); |
| #else |
| if (WaitForSingleObject(condition->waiting_sem_, 0) == WAIT_OBJECT_0) { |
| // a thread is waiting in pthread_cond_wait: allow it to be notified |
| ok = SetEvent(condition->signal_event_); |
| // wait until the event is consumed so the signaler cannot consume |
| // the event via its own pthread_cond_wait. |
| ok &= (WaitForSingleObject(condition->received_sem_, INFINITE) != |
| WAIT_OBJECT_0); |
| } |
| #endif |
| return !ok; |
| } |
| |
| static INLINE int pthread_cond_broadcast(pthread_cond_t *const condition) { |
| int ok = 1; |
| #ifdef USE_WINDOWS_CONDITION_VARIABLE |
| WakeAllConditionVariable(condition); |
| #else |
| while (WaitForSingleObject(condition->waiting_sem_, 0) == WAIT_OBJECT_0) { |
| // a thread is waiting in pthread_cond_wait: allow it to be notified |
| ok &= SetEvent(condition->signal_event_); |
| // wait until the event is consumed so the signaler cannot consume |
| // the event via its own pthread_cond_wait. |
| ok &= (WaitForSingleObject(condition->received_sem_, INFINITE) != |
| WAIT_OBJECT_0); |
| } |
| #endif |
| return !ok; |
| } |
| |
| static INLINE int pthread_cond_wait(pthread_cond_t *const condition, |
| pthread_mutex_t *const mutex) { |
| int ok; |
| #ifdef USE_WINDOWS_CONDITION_VARIABLE |
| ok = SleepConditionVariableCS(condition, mutex, INFINITE); |
| #else |
| // note that there is a consumer available so the signal isn't dropped in |
| // pthread_cond_signal |
| if (!ReleaseSemaphore(condition->waiting_sem_, 1, NULL)) return 1; |
| // now unlock the mutex so pthread_cond_signal may be issued |
| pthread_mutex_unlock(mutex); |
| ok = (WaitForSingleObject(condition->signal_event_, INFINITE) == |
| WAIT_OBJECT_0); |
| ok &= ReleaseSemaphore(condition->received_sem_, 1, NULL); |
| pthread_mutex_lock(mutex); |
| #endif |
| return !ok; |
| } |
| #elif defined(__OS2__) |
| #define INCL_DOS |
| #include <os2.h> // NOLINT |
| |
| #include <errno.h> // NOLINT |
| #include <stdlib.h> // NOLINT |
| #include <sys/builtin.h> // NOLINT |
| |
| #define pthread_t TID |
| #define pthread_mutex_t HMTX |
| |
| typedef struct { |
| HEV event_sem_; |
| HEV ack_sem_; |
| volatile unsigned wait_count_; |
| } pthread_cond_t; |
| |
| //------------------------------------------------------------------------------ |
| // simplistic pthread emulation layer |
| |
| #define THREADFN void * |
| #define THREAD_RETURN(val) (val) |
| |
| typedef struct { |
| void *(*start_)(void *); |
| void *arg_; |
| } thread_arg; |
| |
| static void thread_start(void *arg) { |
| thread_arg targ = *(thread_arg *)arg; |
| free(arg); |
| |
| targ.start_(targ.arg_); |
| } |
| |
| static INLINE int pthread_create(pthread_t *const thread, const void *attr, |
| void *(*start)(void *), void *arg) { |
| int tid; |
| thread_arg *targ = (thread_arg *)malloc(sizeof(*targ)); |
| if (targ == NULL) return 1; |
| |
| (void)attr; |
| |
| targ->start_ = start; |
| targ->arg_ = arg; |
| tid = (pthread_t)_beginthread(thread_start, NULL, 1024 * 1024, targ); |
| if (tid == -1) { |
| free(targ); |
| return 1; |
| } |
| |
| *thread = tid; |
| return 0; |
| } |
| |
| static INLINE int pthread_join(pthread_t thread, void **value_ptr) { |
| (void)value_ptr; |
| return DosWaitThread(&thread, DCWW_WAIT) != 0; |
| } |
| |
| // Mutex |
| static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex, |
| void *mutexattr) { |
| (void)mutexattr; |
| return DosCreateMutexSem(NULL, mutex, 0, FALSE) != 0; |
| } |
| |
| static INLINE int pthread_mutex_trylock(pthread_mutex_t *const mutex) { |
| return DosRequestMutexSem(*mutex, SEM_IMMEDIATE_RETURN) == 0 ? 0 : EBUSY; |
| } |
| |
| static INLINE int pthread_mutex_lock(pthread_mutex_t *const mutex) { |
| return DosRequestMutexSem(*mutex, SEM_INDEFINITE_WAIT) != 0; |
| } |
| |
| static INLINE int pthread_mutex_unlock(pthread_mutex_t *const mutex) { |
| return DosReleaseMutexSem(*mutex) != 0; |
| } |
| |
| static INLINE int pthread_mutex_destroy(pthread_mutex_t *const mutex) { |
| return DosCloseMutexSem(*mutex) != 0; |
| } |
| |
| // Condition |
| static INLINE int pthread_cond_destroy(pthread_cond_t *const condition) { |
| int ok = 1; |
| ok &= DosCloseEventSem(condition->event_sem_) == 0; |
| ok &= DosCloseEventSem(condition->ack_sem_) == 0; |
| return !ok; |
| } |
| |
| static INLINE int pthread_cond_init(pthread_cond_t *const condition, |
| void *cond_attr) { |
| int ok = 1; |
| (void)cond_attr; |
| |
| ok &= |
| DosCreateEventSem(NULL, &condition->event_sem_, DCE_POSTONE, FALSE) == 0; |
| ok &= DosCreateEventSem(NULL, &condition->ack_sem_, DCE_POSTONE, FALSE) == 0; |
| if (!ok) { |
| pthread_cond_destroy(condition); |
| return 1; |
| } |
| condition->wait_count_ = 0; |
| return 0; |
| } |
| |
| static INLINE int pthread_cond_signal(pthread_cond_t *const condition) { |
| int ok = 1; |
| |
| if (!__atomic_cmpxchg32(&condition->wait_count_, 0, 0)) { |
| ok &= DosPostEventSem(condition->event_sem_) == 0; |
| ok &= DosWaitEventSem(condition->ack_sem_, SEM_INDEFINITE_WAIT) == 0; |
| } |
| |
| return !ok; |
| } |
| |
| static INLINE int pthread_cond_broadcast(pthread_cond_t *const condition) { |
| int ok = 1; |
| |
| while (!__atomic_cmpxchg32(&condition->wait_count_, 0, 0)) |
| ok &= pthread_cond_signal(condition) == 0; |
| |
| return !ok; |
| } |
| |
| static INLINE int pthread_cond_wait(pthread_cond_t *const condition, |
| pthread_mutex_t *const mutex) { |
| int ok = 1; |
| |
| __atomic_increment(&condition->wait_count_); |
| |
| ok &= pthread_mutex_unlock(mutex) == 0; |
| |
| ok &= DosWaitEventSem(condition->event_sem_, SEM_INDEFINITE_WAIT) == 0; |
| |
| __atomic_decrement(&condition->wait_count_); |
| |
| ok &= DosPostEventSem(condition->ack_sem_) == 0; |
| |
| pthread_mutex_lock(mutex); |
| |
| return !ok; |
| } |
| #else // _WIN32 |
| #include <pthread.h> // NOLINT |
| #define THREADFN void * |
| #define THREAD_RETURN(val) val |
| #endif |
| |
| #endif // CONFIG_MULTITHREAD |
| |
| // State of the worker thread object |
| typedef enum { |
| NOT_OK = 0, // object is unusable |
| OK, // ready to work |
| WORK // busy finishing the current task |
| } AVxWorkerStatus; |
| |
| // Function to be called by the worker thread. Takes two opaque pointers as |
| // arguments (data1 and data2), and should return false in case of error. |
| typedef int (*AVxWorkerHook)(void *, void *); |
| |
| // Platform-dependent implementation details for the worker. |
| typedef struct AVxWorkerImpl AVxWorkerImpl; |
| |
| // Synchronization object used to launch job in the worker thread |
| typedef struct { |
| AVxWorkerImpl *impl_; |
| AVxWorkerStatus status_; |
| AVxWorkerHook hook; // hook to call |
| void *data1; // first argument passed to 'hook' |
| void *data2; // second argument passed to 'hook' |
| int had_error; // return value of the last call to 'hook' |
| } AVxWorker; |
| |
| // The interface for all thread-worker related functions. All these functions |
| // must be implemented. |
| typedef struct { |
| // Must be called first, before any other method. |
| void (*init)(AVxWorker *const worker); |
| // Must be called to initialize the object and spawn the thread. Re-entrant. |
| // Will potentially launch the thread. Returns false in case of error. |
| int (*reset)(AVxWorker *const worker); |
| // Makes sure the previous work is finished. Returns true if worker->had_error |
| // was not set and no error condition was triggered by the working thread. |
| int (*sync)(AVxWorker *const worker); |
| // Triggers the thread to call hook() with data1 and data2 arguments. These |
| // hook/data1/data2 values can be changed at any time before calling this |
| // function, but not be changed afterward until the next call to Sync(). |
| void (*launch)(AVxWorker *const worker); |
| // This function is similar to launch() except that it calls the |
| // hook directly instead of using a thread. Convenient to bypass the thread |
| // mechanism while still using the AVxWorker structs. sync() must |
| // still be called afterward (for error reporting). |
| void (*execute)(AVxWorker *const worker); |
| // Kill the thread and terminate the object. To use the object again, one |
| // must call reset() again. |
| void (*end)(AVxWorker *const worker); |
| } AVxWorkerInterface; |
| |
| // Install a new set of threading functions, overriding the defaults. This |
| // should be done before any workers are started, i.e., before any encoding or |
| // decoding takes place. The contents of the interface struct are copied, it |
| // is safe to free the corresponding memory after this call. This function is |
| // not thread-safe. Return false in case of invalid pointer or methods. |
| int aom_set_worker_interface(const AVxWorkerInterface *const winterface); |
| |
| // Retrieve the currently set thread worker interface. |
| const AVxWorkerInterface *aom_get_worker_interface(void); |
| |
| //------------------------------------------------------------------------------ |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif // AOM_THREAD_H_ |