summaryrefslogtreecommitdiffstats
path: root/third_party/aom/aom_util/aom_thread.h
blob: 0ae8f2f49d469edcab19a15a2c7b8ae758ff2b6a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
/*
 * 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 "./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_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_