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// Copyright 2019 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/threading/scoped_thread_priority.h"
#include "base/check_op.h"
#include "base/location.h"
#include "base/threading/platform_thread.h"
#include "base/trace_event/interned_args_helper.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#endif
namespace base {
namespace {
PlatformThreadHandle PortableCurrentThreadHandle() {
PlatformThreadHandle current = PlatformThread::CurrentHandle();
#if BUILDFLAG(IS_WIN)
PlatformThreadHandle::Handle platform_handle;
BOOL did_dup = ::DuplicateHandle(
::GetCurrentProcess(), current.platform_handle(), ::GetCurrentProcess(),
&platform_handle, 0, false, DUPLICATE_SAME_ACCESS);
if (!did_dup) {
return PlatformThreadHandle();
}
return PlatformThreadHandle(platform_handle);
#else
return current;
#endif
}
} // namespace
ScopedBoostPriority::ScopedBoostPriority(ThreadType target_thread_type) {
CHECK_LT(target_thread_type, ThreadType::kRealtimeAudio);
const ThreadType original_thread_type =
PlatformThread::GetCurrentThreadType();
const bool should_boost = original_thread_type < target_thread_type &&
PlatformThread::CanChangeThreadType(
original_thread_type, target_thread_type) &&
PlatformThread::CanChangeThreadType(
target_thread_type, original_thread_type);
if (should_boost) {
original_thread_type_.emplace(original_thread_type);
// Do not change the affinity, this is meant to make sure the thread runs,
// not that it changes which core can it can run on.
PlatformThread::SetCurrentThreadType(target_thread_type,
/* may_change_affinity = */ false);
}
}
ScopedBoostPriority::~ScopedBoostPriority() {
if (original_thread_type_.has_value()) {
// See above, do not change the affinity.
PlatformThread::SetCurrentThreadType(original_thread_type_.value(),
/* may_change_affinity = */ false);
}
}
ScopedBoostablePriority::ScopedBoostablePriority()
: initial_thread_type_(PlatformThread::GetCurrentThreadType()),
thread_handle_(PortableCurrentThreadHandle())
#if BUILDFLAG(IS_WIN)
,
scoped_handle_(thread_handle_.platform_handle())
#endif
{
}
ScopedBoostablePriority::~ScopedBoostablePriority() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
Reset();
}
bool ScopedBoostablePriority::BoostPriority(ThreadType target_thread_type) {
CHECK_LT(target_thread_type, ThreadType::kRealtimeAudio);
if (thread_handle_.is_null()) {
return false;
}
const bool should_boost = target_thread_type > initial_thread_type_ &&
PlatformThread::CanChangeThreadType(
initial_thread_type_, target_thread_type) &&
PlatformThread::CanChangeThreadType(
target_thread_type, initial_thread_type_);
if (!should_boost) {
return false;
}
if (did_override_priority_) {
return false;
}
did_override_priority_ = true;
priority_override_handle_ =
internal::SetThreadTypeOverride(thread_handle_, target_thread_type);
return priority_override_handle_;
}
void ScopedBoostablePriority::Reset() {
if (thread_handle_.is_null()) {
return;
}
if (did_override_priority_) {
internal::RemoveThreadTypeOverride(
thread_handle_, priority_override_handle_, initial_thread_type_);
did_override_priority_ = false;
}
}
TaskMonitoringScopedBoostPriority::TaskMonitoringScopedBoostPriority(
ThreadType target_thread_type,
RepeatingCallback<bool()> should_boost_callback)
: target_thread_type_(target_thread_type),
should_boost_callback_(std::move(should_boost_callback)) {
CHECK(should_boost_callback_);
}
TaskMonitoringScopedBoostPriority::~TaskMonitoringScopedBoostPriority() {
scoped_boost_priority_.reset();
}
void TaskMonitoringScopedBoostPriority::WillProcessTask(
const PendingTask& pending_task,
bool was_blocked_or_low_priority) {
bool should_boost = should_boost_callback_.Run();
if (scoped_boost_priority_.has_value() == should_boost) {
return;
}
if (should_boost) {
scoped_boost_priority_.emplace(target_thread_type_);
} else {
scoped_boost_priority_.reset();
}
}
namespace internal {
ScopedMayLoadLibraryAtBackgroundPriority::
ScopedMayLoadLibraryAtBackgroundPriority(const Location& from_here,
std::atomic_bool* already_loaded)
#if BUILDFLAG(IS_WIN)
: already_loaded_(already_loaded)
#endif // BUILDFLAG(IS_WIN)
{
TRACE_EVENT_BEGIN(
"base", "ScopedMayLoadLibraryAtBackgroundPriority",
[&](perfetto::EventContext ctx) {
ctx.event()->set_source_location_iid(
base::trace_event::InternedSourceLocation::Get(&ctx, from_here));
});
#if BUILDFLAG(IS_WIN)
if (already_loaded_ && already_loaded_->load(std::memory_order_relaxed)) {
return;
}
const base::ThreadType thread_type = PlatformThread::GetCurrentThreadType();
if (thread_type == base::ThreadType::kBackground) {
original_thread_type_ = thread_type;
PlatformThread::SetCurrentThreadType(base::ThreadType::kDefault);
TRACE_EVENT_BEGIN0(
"base",
"ScopedMayLoadLibraryAtBackgroundPriority : Priority Increased");
}
#endif // BUILDFLAG(IS_WIN)
}
ScopedMayLoadLibraryAtBackgroundPriority::
~ScopedMayLoadLibraryAtBackgroundPriority() {
// Trace events must be closed in reverse order of opening so that they nest
// correctly.
#if BUILDFLAG(IS_WIN)
if (original_thread_type_) {
TRACE_EVENT_END0(
"base",
"ScopedMayLoadLibraryAtBackgroundPriority : Priority Increased");
PlatformThread::SetCurrentThreadType(original_thread_type_.value());
}
if (already_loaded_) {
already_loaded_->store(true, std::memory_order_relaxed);
}
#endif // BUILDFLAG(IS_WIN)
TRACE_EVENT_END0("base", "ScopedMayLoadLibraryAtBackgroundPriority");
}
} // namespace internal
} // namespace base
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