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/*
* Copyright 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include <gui/FenceMonitor.h>
#include <gui/TraceUtils.h>
#include <log/log.h>
#include <thread>
namespace android::gui {
FenceMonitor::FenceMonitor(const char* name) : mName(name), mFencesQueued(0), mFencesSignaled(0) {
std::thread thread(&FenceMonitor::loop, this);
pthread_setname_np(thread.native_handle(), mName);
thread.detach();
}
void FenceMonitor::queueFence(const sp<Fence>& fence) {
char message[64];
std::lock_guard<std::mutex> lock(mMutex);
if (fence->getSignalTime() != Fence::SIGNAL_TIME_PENDING) {
snprintf(message, sizeof(message), "%s fence %u has signaled", mName, mFencesQueued);
ATRACE_NAME(message);
// Need an increment on both to make the trace number correct.
mFencesQueued++;
mFencesSignaled++;
return;
}
snprintf(message, sizeof(message), "Trace %s fence %u", mName, mFencesQueued);
ATRACE_NAME(message);
mQueue.push_back(fence);
mCondition.notify_one();
mFencesQueued++;
ATRACE_INT(mName, int32_t(mQueue.size()));
}
void FenceMonitor::loop() {
while (true) {
threadLoop();
}
}
void FenceMonitor::threadLoop() {
sp<Fence> fence;
uint32_t fenceNum;
{
std::unique_lock<std::mutex> lock(mMutex);
while (mQueue.empty()) {
mCondition.wait(lock);
}
fence = mQueue[0];
fenceNum = mFencesSignaled;
}
{
char message[64];
snprintf(message, sizeof(message), "waiting for %s %u", mName, fenceNum);
ATRACE_NAME(message);
status_t result = fence->waitForever(message);
if (result != OK) {
ALOGE("Error waiting for fence: %d", result);
}
}
{
std::lock_guard<std::mutex> lock(mMutex);
mQueue.pop_front();
mFencesSignaled++;
ATRACE_INT(mName, int32_t(mQueue.size()));
}
}
} // namespace android::gui
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