142 строки
4.0 KiB
C
142 строки
4.0 KiB
C
// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Multi-threaded worker
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//
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// Original source:
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// http://git.chromium.org/webm/libwebp.git
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// 100644 blob eff8f2a8c20095aade3c292b0e9292dac6cb3587 src/utils/thread.c
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#include <assert.h>
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#include <string.h> // for memset()
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#include "./vp9_thread.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#if CONFIG_MULTITHREAD
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//------------------------------------------------------------------------------
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static THREADFN thread_loop(void *ptr) { // thread loop
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VP9Worker* const worker = (VP9Worker*)ptr;
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int done = 0;
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while (!done) {
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pthread_mutex_lock(&worker->mutex_);
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while (worker->status_ == OK) { // wait in idling mode
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pthread_cond_wait(&worker->condition_, &worker->mutex_);
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}
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if (worker->status_ == WORK) {
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vp9_worker_execute(worker);
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worker->status_ = OK;
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} else if (worker->status_ == NOT_OK) { // finish the worker
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done = 1;
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}
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// signal to the main thread that we're done (for Sync())
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pthread_cond_signal(&worker->condition_);
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pthread_mutex_unlock(&worker->mutex_);
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}
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return THREAD_RETURN(NULL); // Thread is finished
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}
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// main thread state control
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static void change_state(VP9Worker* const worker,
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VP9WorkerStatus new_status) {
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// no-op when attempting to change state on a thread that didn't come up
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if (worker->status_ < OK) return;
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pthread_mutex_lock(&worker->mutex_);
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// wait for the worker to finish
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while (worker->status_ != OK) {
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pthread_cond_wait(&worker->condition_, &worker->mutex_);
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}
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// assign new status and release the working thread if needed
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if (new_status != OK) {
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worker->status_ = new_status;
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pthread_cond_signal(&worker->condition_);
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}
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pthread_mutex_unlock(&worker->mutex_);
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}
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#endif // CONFIG_MULTITHREAD
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//------------------------------------------------------------------------------
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void vp9_worker_init(VP9Worker* const worker) {
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memset(worker, 0, sizeof(*worker));
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worker->status_ = NOT_OK;
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}
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int vp9_worker_sync(VP9Worker* const worker) {
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#if CONFIG_MULTITHREAD
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change_state(worker, OK);
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#endif
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assert(worker->status_ <= OK);
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return !worker->had_error;
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}
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int vp9_worker_reset(VP9Worker* const worker) {
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int ok = 1;
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worker->had_error = 0;
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if (worker->status_ < OK) {
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#if CONFIG_MULTITHREAD
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if (pthread_mutex_init(&worker->mutex_, NULL) ||
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pthread_cond_init(&worker->condition_, NULL)) {
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return 0;
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}
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pthread_mutex_lock(&worker->mutex_);
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ok = !pthread_create(&worker->thread_, NULL, thread_loop, worker);
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if (ok) worker->status_ = OK;
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pthread_mutex_unlock(&worker->mutex_);
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#else
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worker->status_ = OK;
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#endif
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} else if (worker->status_ > OK) {
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ok = vp9_worker_sync(worker);
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}
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assert(!ok || (worker->status_ == OK));
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return ok;
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}
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void vp9_worker_execute(VP9Worker* const worker) {
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if (worker->hook != NULL) {
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worker->had_error |= !worker->hook(worker->data1, worker->data2);
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}
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}
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void vp9_worker_launch(VP9Worker* const worker) {
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#if CONFIG_MULTITHREAD
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change_state(worker, WORK);
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#else
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vp9_worker_execute(worker);
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#endif
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}
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void vp9_worker_end(VP9Worker* const worker) {
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if (worker->status_ >= OK) {
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#if CONFIG_MULTITHREAD
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change_state(worker, NOT_OK);
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pthread_join(worker->thread_, NULL);
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pthread_mutex_destroy(&worker->mutex_);
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pthread_cond_destroy(&worker->condition_);
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#else
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worker->status_ = NOT_OK;
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#endif
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}
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assert(worker->status_ == NOT_OK);
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}
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//------------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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