246 lines
8.3 KiB
C
246 lines
8.3 KiB
C
/*
|
|
* 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
|
|
|
|
// Enable GNU extensions in glibc so that we can call pthread_setname_np().
|
|
// This must be before any #include statements.
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE
|
|
#endif
|
|
|
|
#include <assert.h>
|
|
#include <string.h> // for memset()
|
|
|
|
#include "config/aom_config.h"
|
|
|
|
#include "aom_mem/aom_mem.h"
|
|
#include "aom_ports/sanitizer.h"
|
|
#include "aom_util/aom_pthread.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;
|
|
#ifdef __APPLE__
|
|
if (worker->thread_name != NULL) {
|
|
// Apple's version of pthread_setname_np takes one argument and operates on
|
|
// the current thread only. The maximum size of the thread_name buffer was
|
|
// noted in the Chromium source code and was confirmed by experiments. If
|
|
// thread_name is too long, pthread_setname_np returns -1 with errno
|
|
// ENAMETOOLONG (63).
|
|
char thread_name[64];
|
|
strncpy(thread_name, worker->thread_name, sizeof(thread_name) - 1);
|
|
thread_name[sizeof(thread_name) - 1] = '\0';
|
|
pthread_setname_np(thread_name);
|
|
}
|
|
#elif (defined(__GLIBC__) && !defined(__GNU__)) || defined(__BIONIC__)
|
|
if (worker->thread_name != NULL) {
|
|
// Linux and Android require names (with nul) fit in 16 chars, otherwise
|
|
// pthread_setname_np() returns ERANGE (34).
|
|
char thread_name[16];
|
|
strncpy(thread_name, worker->thread_name, sizeof(thread_name) - 1);
|
|
thread_name[sizeof(thread_name) - 1] = '\0';
|
|
pthread_setname_np(pthread_self(), thread_name);
|
|
}
|
|
#endif
|
|
pthread_mutex_lock(&worker->impl_->mutex_);
|
|
for (;;) {
|
|
while (worker->status_ == AVX_WORKER_STATUS_OK) { // wait in idling mode
|
|
pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
|
|
}
|
|
if (worker->status_ == AVX_WORKER_STATUS_WORKING) {
|
|
// When worker->status_ is AVX_WORKER_STATUS_WORKING, the main thread
|
|
// doesn't change worker->status_ and will wait until the worker changes
|
|
// worker->status_ to AVX_WORKER_STATUS_OK. See change_state(). So the
|
|
// worker can safely call execute() without holding worker->impl_->mutex_.
|
|
// When the worker reacquires worker->impl_->mutex_, worker->status_ must
|
|
// still be AVX_WORKER_STATUS_WORKING.
|
|
pthread_mutex_unlock(&worker->impl_->mutex_);
|
|
execute(worker);
|
|
pthread_mutex_lock(&worker->impl_->mutex_);
|
|
assert(worker->status_ == AVX_WORKER_STATUS_WORKING);
|
|
worker->status_ = AVX_WORKER_STATUS_OK;
|
|
// signal to the main thread that we're done (for sync())
|
|
pthread_cond_signal(&worker->impl_->condition_);
|
|
} else {
|
|
assert(worker->status_ == AVX_WORKER_STATUS_NOT_OK); // finish the worker
|
|
break;
|
|
}
|
|
}
|
|
pthread_mutex_unlock(&worker->impl_->mutex_);
|
|
return THREAD_EXIT_SUCCESS; // 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_ >= AVX_WORKER_STATUS_OK) {
|
|
// wait for the worker to finish
|
|
while (worker->status_ != AVX_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 != AVX_WORKER_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_ = AVX_WORKER_STATUS_NOT_OK;
|
|
}
|
|
|
|
static int sync(AVxWorker *const worker) {
|
|
#if CONFIG_MULTITHREAD
|
|
change_state(worker, AVX_WORKER_STATUS_OK);
|
|
#endif
|
|
assert(worker->status_ <= AVX_WORKER_STATUS_OK);
|
|
return !worker->had_error;
|
|
}
|
|
|
|
static int reset(AVxWorker *const worker) {
|
|
int ok = 1;
|
|
worker->had_error = 0;
|
|
if (worker->status_ < AVX_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_attr_t attr;
|
|
if (pthread_attr_init(&attr)) goto Error2;
|
|
// Debug ASan builds require at least ~1MiB of stack; prevents
|
|
// failures on macOS arm64 where the default is 512KiB.
|
|
// See: https://crbug.com/aomedia/3379
|
|
#if defined(AOM_ADDRESS_SANITIZER) && defined(__APPLE__) && AOM_ARCH_ARM && \
|
|
!defined(NDEBUG)
|
|
const size_t kMinStackSize = 1024 * 1024;
|
|
#else
|
|
const size_t kMinStackSize = 256 * 1024;
|
|
#endif
|
|
size_t stacksize;
|
|
if (!pthread_attr_getstacksize(&attr, &stacksize)) {
|
|
if (stacksize < kMinStackSize &&
|
|
pthread_attr_setstacksize(&attr, kMinStackSize)) {
|
|
pthread_attr_destroy(&attr);
|
|
goto Error2;
|
|
}
|
|
}
|
|
pthread_mutex_lock(&worker->impl_->mutex_);
|
|
ok = !pthread_create(&worker->impl_->thread_, &attr, thread_loop, worker);
|
|
if (ok) worker->status_ = AVX_WORKER_STATUS_OK;
|
|
pthread_mutex_unlock(&worker->impl_->mutex_);
|
|
pthread_attr_destroy(&attr);
|
|
if (!ok) {
|
|
Error2:
|
|
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_ = AVX_WORKER_STATUS_OK;
|
|
#endif
|
|
} else if (worker->status_ > AVX_WORKER_STATUS_OK) {
|
|
ok = sync(worker);
|
|
}
|
|
assert(!ok || (worker->status_ == AVX_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, AVX_WORKER_STATUS_WORKING);
|
|
#else
|
|
execute(worker);
|
|
#endif
|
|
}
|
|
|
|
static void end(AVxWorker *const worker) {
|
|
#if CONFIG_MULTITHREAD
|
|
if (worker->impl_ != NULL) {
|
|
change_state(worker, AVX_WORKER_STATUS_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_ = AVX_WORKER_STATUS_NOT_OK;
|
|
assert(worker->impl_ == NULL);
|
|
#endif
|
|
assert(worker->status_ == AVX_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;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|