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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/task/thread_pool/environment_config.h"
#include "base/base_switches.h"
#include "base/synchronization/lock.h"
#include "base/synchronization/lock_impl.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_ANDROID)
#include "base/android/background_thread_pool_field_trial.h"
#endif // BUILDFLAG(IS_ANDROID)
namespace base::internal {
namespace {
bool CanUseBackgroundThreadTypeForWorkerThreadImpl() {
#if BUILDFLAG(IS_ANDROID)
return base::android::BackgroundThreadPoolFieldTrial::
ShouldUseBackgroundThreadPool();
#else // BUILDFLAG(IS_ANDROID)
// When Lock doesn't handle multiple thread priorities, run all
// WorkerThread with a normal priority to avoid priority inversion when a
// thread running with a normal priority tries to acquire a lock held by a
// thread running with a background priority.
if (!Lock::HandlesMultipleThreadPriorities()) {
return false;
}
// When thread type can't be increased to kNormal, run all threads with a
// kNormal thread type to avoid priority inversions on shutdown
// (ThreadPoolImpl increases kBackground threads type to kNormal on shutdown
// while resolving remaining shutdown blocking tasks).
//
// This is ignored on Android, because it doesn't have a clean shutdown phase.
if (!PlatformThread::CanChangeThreadType(ThreadType::kBackground,
ThreadType::kDefault)) {
return false;
}
return true;
#endif // BUILDFLAG(IS_ANDROID)
}
bool CanUseUtilityThreadTypeForWorkerThreadImpl() {
#if !BUILDFLAG(IS_ANDROID)
// Same as CanUseBackgroundThreadTypeForWorkerThreadImpl()
if (!PlatformThread::CanChangeThreadType(ThreadType::kUtility,
ThreadType::kDefault)) {
return false;
}
#endif // BUILDFLAG(IS_ANDROID)
return true;
}
} // namespace
bool CanUseBackgroundThreadTypeForWorkerThread() {
static const bool can_use_background_thread_type_for_worker_thread =
CanUseBackgroundThreadTypeForWorkerThreadImpl();
return can_use_background_thread_type_for_worker_thread;
}
bool CanUseUtilityThreadTypeForWorkerThread() {
static const bool can_use_utility_thread_type_for_worker_thread =
CanUseUtilityThreadTypeForWorkerThreadImpl();
return can_use_utility_thread_type_for_worker_thread;
}
} // namespace base::internal
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