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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/base/user_input_monitor.h"
#include <utility>
#include "base/atomicops.h"
#include "base/logging.h"
#include "base/task/single_thread_task_runner.h"
namespace media {
uint32_t ReadKeyPressMonitorCount(
const base::ReadOnlySharedMemoryMapping& readonly_mapping) {
if (!readonly_mapping.IsValid())
return 0;
// No ordering constraints between Load/Store operations, a temporary
// inconsistent value is fine.
return base::subtle::NoBarrier_Load(
reinterpret_cast<const base::subtle::Atomic32*>(
readonly_mapping.memory()));
}
void WriteKeyPressMonitorCount(
const base::WritableSharedMemoryMapping& writable_mapping,
uint32_t count) {
if (!writable_mapping.IsValid())
return;
// No ordering constraints between Load/Store operations, a temporary
// inconsistent value is fine.
base::subtle::NoBarrier_Store(
static_cast<base::subtle::Atomic32*>(writable_mapping.memory()), count);
}
#ifdef DISABLE_USER_INPUT_MONITOR
// static
std::unique_ptr<UserInputMonitor> UserInputMonitor::Create(
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
return nullptr;
}
#endif // DISABLE_USER_INPUT_MONITOR
UserInputMonitor::UserInputMonitor() = default;
UserInputMonitor::~UserInputMonitor() = default;
UserInputMonitorBase::UserInputMonitorBase() {
DETACH_FROM_SEQUENCE(owning_sequence_);
}
UserInputMonitorBase::~UserInputMonitorBase() {
// |references_| may be non-zero as it's decremented due to Mojo messages from
// the renderer, and they may not reach the browser always in tests.
}
void UserInputMonitorBase::EnableKeyPressMonitoring() {
DCHECK_CALLED_ON_VALID_SEQUENCE(owning_sequence_);
if (++references_ == 1) {
StartKeyboardMonitoring();
DVLOG(2) << "Started keyboard monitoring.";
}
}
base::ReadOnlySharedMemoryRegion
UserInputMonitorBase::EnableKeyPressMonitoringWithMapping() {
DCHECK_CALLED_ON_VALID_SEQUENCE(owning_sequence_);
if (++references_ == 1) {
base::MappedReadOnlyRegion shmem =
base::ReadOnlySharedMemoryRegion::Create(sizeof(uint32_t));
if (!shmem.IsValid()) {
DVLOG(2) << "Error mapping key press count shmem.";
return base::ReadOnlySharedMemoryRegion();
}
key_press_count_region_ =
base::ReadOnlySharedMemoryRegion(std::move(shmem.region));
WriteKeyPressMonitorCount(shmem.mapping, 0u);
StartKeyboardMonitoring(std::move(shmem.mapping));
DVLOG(2) << "Started keyboard monitoring.";
}
return key_press_count_region_.Duplicate();
}
void UserInputMonitorBase::DisableKeyPressMonitoring() {
DCHECK_CALLED_ON_VALID_SEQUENCE(owning_sequence_);
DCHECK_NE(references_, 0u);
if (--references_ == 0) {
key_press_count_region_ = base::ReadOnlySharedMemoryRegion();
StopKeyboardMonitoring();
DVLOG(2) << "Stopped keyboard monitoring.";
}
}
} // namespace media
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