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/*
* 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
#include <assert.h>
#include <string.h> // for memset()
#include "aom_mem/aom_mem.h"
#include "aom_util/aom_thread.h"
#if CONFIG_MULTITHREAD
struct AVxWorkerImpl {
pthread_mutex_t mutex_;
pthread_cond_t condition_;
pthread_t thread_;
};
//------------------------------------------------------------------------------
static void execute(AVxWorker *const worker); // Forward declaration.
static THREADFN thread_loop(void *ptr) {
AVxWorker *const worker = (AVxWorker *)ptr;
int done = 0;
while (!done) {
pthread_mutex_lock(&worker->impl_->mutex_);
while (worker->status_ == OK) { // wait in idling mode
pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
}
if (worker->status_ == WORK) {
execute(worker);
worker->status_ = OK;
} else if (worker->status_ == NOT_OK) { // finish the worker
done = 1;
}
// signal to the main thread that we're done (for sync())
pthread_cond_signal(&worker->impl_->condition_);
pthread_mutex_unlock(&worker->impl_->mutex_);
}
return THREAD_RETURN(NULL); // Thread is finished
}
// main thread state control
static void change_state(AVxWorker *const worker, AVxWorkerStatus new_status) {
// No-op when attempting to change state on a thread that didn't come up.
// Checking status_ without acquiring the lock first would result in a data
// race.
if (worker->impl_ == NULL) return;
pthread_mutex_lock(&worker->impl_->mutex_);
if (worker->status_ >= OK) {
// wait for the worker to finish
while (worker->status_ != OK) {
pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
}
// assign new status and release the working thread if needed
if (new_status != OK) {
worker->status_ = new_status;
pthread_cond_signal(&worker->impl_->condition_);
}
}
pthread_mutex_unlock(&worker->impl_->mutex_);
}
#endif // CONFIG_MULTITHREAD
//------------------------------------------------------------------------------
static void init(AVxWorker *const worker) {
memset(worker, 0, sizeof(*worker));
worker->status_ = NOT_OK;
}
static int sync(AVxWorker *const worker) {
#if CONFIG_MULTITHREAD
change_state(worker, OK);
#endif
assert(worker->status_ <= OK);
return !worker->had_error;
}
static int reset(AVxWorker *const worker) {
int ok = 1;
worker->had_error = 0;
if (worker->status_ < OK) {
#if CONFIG_MULTITHREAD
worker->impl_ = (AVxWorkerImpl *)aom_calloc(1, sizeof(*worker->impl_));
if (worker->impl_ == NULL) {
return 0;
}
if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {
goto Error;
}
if (pthread_cond_init(&worker->impl_->condition_, NULL)) {
pthread_mutex_destroy(&worker->impl_->mutex_);
goto Error;
}
pthread_mutex_lock(&worker->impl_->mutex_);
ok = !pthread_create(&worker->impl_->thread_, NULL, thread_loop, worker);
if (ok) worker->status_ = OK;
pthread_mutex_unlock(&worker->impl_->mutex_);
if (!ok) {
pthread_mutex_destroy(&worker->impl_->mutex_);
pthread_cond_destroy(&worker->impl_->condition_);
Error:
aom_free(worker->impl_);
worker->impl_ = NULL;
return 0;
}
#else
worker->status_ = OK;
#endif
} else if (worker->status_ > OK) {
ok = sync(worker);
}
assert(!ok || (worker->status_ == OK));
return ok;
}
static void execute(AVxWorker *const worker) {
if (worker->hook != NULL) {
worker->had_error |= !worker->hook(worker->data1, worker->data2);
}
}
static void launch(AVxWorker *const worker) {
#if CONFIG_MULTITHREAD
change_state(worker, WORK);
#else
execute(worker);
#endif
}
static void end(AVxWorker *const worker) {
#if CONFIG_MULTITHREAD
if (worker->impl_ != NULL) {
change_state(worker, NOT_OK);
pthread_join(worker->impl_->thread_, NULL);
pthread_mutex_destroy(&worker->impl_->mutex_);
pthread_cond_destroy(&worker->impl_->condition_);
aom_free(worker->impl_);
worker->impl_ = NULL;
}
#else
worker->status_ = NOT_OK;
assert(worker->impl_ == NULL);
#endif
assert(worker->status_ == NOT_OK);
}
//------------------------------------------------------------------------------
static AVxWorkerInterface g_worker_interface = { init, reset, sync,
launch, execute, end };
int aom_set_worker_interface(const AVxWorkerInterface *const winterface) {
if (winterface == NULL || winterface->init == NULL ||
winterface->reset == NULL || winterface->sync == NULL ||
winterface->launch == NULL || winterface->execute == NULL ||
winterface->end == NULL) {
return 0;
}
g_worker_interface = *winterface;
return 1;
}
const AVxWorkerInterface *aom_get_worker_interface(void) {
return &g_worker_interface;
}
//------------------------------------------------------------------------------
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