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/*
* Copyright (C) 2021 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.
*/
#include <signal.h>
#include <stdint.h>
#include <atomic>
#include <thread>
#include <android-base/threads.h>
#include <benchmark/benchmark.h>
#include <unwindstack/Memory.h>
#include <unwindstack/Unwinder.h>
constexpr size_t kMaxFrames = 32;
void ThreadCall6(std::atomic_int* tid, std::atomic_bool* done) {
tid->store(android::base::GetThreadId());
while (!done->load()) {
}
}
void ThreadCall5(std::atomic_int* tid, std::atomic_bool* done) {
ThreadCall6(tid, done);
}
void ThreadCall4(std::atomic_int* tid, std::atomic_bool* done) {
ThreadCall5(tid, done);
}
void ThreadCall3(std::atomic_int* tid, std::atomic_bool* done) {
ThreadCall4(tid, done);
}
void ThreadCall2(std::atomic_int* tid, std::atomic_bool* done) {
ThreadCall3(tid, done);
}
void ThreadCall1(std::atomic_int* tid, std::atomic_bool* done) {
ThreadCall2(tid, done);
}
static void BM_thread_unwind(benchmark::State& state) {
std::atomic_int tid(0);
std::atomic_bool done;
// Create the thread before the unwinder object so all maps are no
// longer changing.
std::thread thread([&tid, &done] { ThreadCall1(&tid, &done); });
while (tid.load() == 0) {
}
unwindstack::ThreadUnwinder unwinder(kMaxFrames);
if (!unwinder.Init()) {
state.SkipWithError("Failed to init.");
}
for (const auto& _ : state) {
unwinder.UnwindWithSignal(SIGRTMIN, tid.load());
if (unwinder.NumFrames() < 5) {
state.SkipWithError("Failed to unwind.");
}
}
done.store(true);
thread.join();
}
BENCHMARK(BM_thread_unwind);
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