mirror of
https://github.com/classilla/tenfourfox.git
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185 lines
5.4 KiB
C
185 lines
5.4 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 264210ba2807e4da47eb5d18c04cf869d89b9784 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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#include "vpx_mem/vpx_mem.h"
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#if CONFIG_MULTITHREAD
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struct VP9WorkerImpl {
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pthread_mutex_t mutex_;
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pthread_cond_t condition_;
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pthread_t thread_;
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};
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//------------------------------------------------------------------------------
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static void execute(VP9Worker *const worker); // Forward declaration.
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static THREADFN thread_loop(void *ptr) {
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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->impl_->mutex_);
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while (worker->status_ == OK) { // wait in idling mode
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pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
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}
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if (worker->status_ == WORK) {
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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->impl_->condition_);
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pthread_mutex_unlock(&worker->impl_->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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// Checking status_ without acquiring the lock first would result in a data
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// race.
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if (worker->impl_ == NULL) return;
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pthread_mutex_lock(&worker->impl_->mutex_);
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if (worker->status_ >= OK) {
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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->impl_->condition_, &worker->impl_->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->impl_->condition_);
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}
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}
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pthread_mutex_unlock(&worker->impl_->mutex_);
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}
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#endif // CONFIG_MULTITHREAD
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//------------------------------------------------------------------------------
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static void 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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static int 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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static int 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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worker->impl_ = (VP9WorkerImpl*)vpx_calloc(1, sizeof(*worker->impl_));
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if (worker->impl_ == NULL) {
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return 0;
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}
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if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {
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goto Error;
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}
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if (pthread_cond_init(&worker->impl_->condition_, NULL)) {
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pthread_mutex_destroy(&worker->impl_->mutex_);
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goto Error;
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}
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pthread_mutex_lock(&worker->impl_->mutex_);
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ok = !pthread_create(&worker->impl_->thread_, NULL, thread_loop, worker);
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if (ok) worker->status_ = OK;
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pthread_mutex_unlock(&worker->impl_->mutex_);
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if (!ok) {
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pthread_mutex_destroy(&worker->impl_->mutex_);
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pthread_cond_destroy(&worker->impl_->condition_);
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Error:
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vpx_free(worker->impl_);
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worker->impl_ = NULL;
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return 0;
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}
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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 = 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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static void 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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static void 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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execute(worker);
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#endif
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}
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static void end(VP9Worker *const worker) {
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#if CONFIG_MULTITHREAD
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if (worker->impl_ != NULL) {
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change_state(worker, NOT_OK);
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pthread_join(worker->impl_->thread_, NULL);
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pthread_mutex_destroy(&worker->impl_->mutex_);
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pthread_cond_destroy(&worker->impl_->condition_);
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vpx_free(worker->impl_);
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worker->impl_ = NULL;
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}
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#else
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worker->status_ = NOT_OK;
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assert(worker->impl_ == NULL);
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#endif
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assert(worker->status_ == NOT_OK);
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}
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//------------------------------------------------------------------------------
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static VP9WorkerInterface g_worker_interface = {
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init, reset, sync, launch, execute, end
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};
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int vp9_set_worker_interface(const VP9WorkerInterface* const winterface) {
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if (winterface == NULL ||
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winterface->init == NULL || winterface->reset == NULL ||
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winterface->sync == NULL || winterface->launch == NULL ||
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winterface->execute == NULL || winterface->end == NULL) {
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return 0;
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}
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g_worker_interface = *winterface;
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return 1;
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}
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const VP9WorkerInterface *vp9_get_worker_interface(void) {
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return &g_worker_interface;
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}
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//------------------------------------------------------------------------------
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