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-rw-r--r--media/libaom/src/aom_util/aom_thread.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/media/libaom/src/aom_util/aom_thread.c b/media/libaom/src/aom_util/aom_thread.c
new file mode 100644
index 000000000..cae9f5e25
--- /dev/null
+++ b/media/libaom/src/aom_util/aom_thread.c
@@ -0,0 +1,184 @@
+/*
+ * 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;
+}
+
+//------------------------------------------------------------------------------