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// Copyright 2018 The gVisor Authors.
//
// 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.
#ifndef GVISOR_TEST_UTIL_THREAD_UTIL_H_
#define GVISOR_TEST_UTIL_THREAD_UTIL_H_
#include <pthread.h>
#ifdef __linux__
#include <sys/syscall.h>
#endif
#include <unistd.h>
#include <functional>
#include <utility>
#include "test/util/logging.h"
namespace gvisor {
namespace testing {
// ScopedThread is a minimal wrapper around pthreads.
//
// This is used in lieu of more complex mechanisms because it provides very
// predictable behavior (no messing with timers, etc.) The thread will
// automatically joined when it is destructed (goes out of scope), but can be
// joined manually as well.
class ScopedThread {
public:
// Constructs a thread that executes f exactly once.
explicit ScopedThread(std::function<void*()> f) : f_(std::move(f)) {
CreateThread();
}
explicit ScopedThread(const std::function<void()>& f) {
f_ = [=] {
f();
return nullptr;
};
CreateThread();
}
ScopedThread(const ScopedThread& other) = delete;
ScopedThread& operator=(const ScopedThread& other) = delete;
// Joins the thread.
~ScopedThread() { Join(); }
// Waits until this thread has finished executing. Join is idempotent and may
// be called multiple times, however Join itself is not thread-safe.
void* Join() {
if (!joined_) {
TEST_PCHECK(pthread_join(pt_, &retval_) == 0);
joined_ = true;
}
return retval_;
}
private:
void CreateThread() {
TEST_PCHECK_MSG(pthread_create(
&pt_, /* attr = */ nullptr,
+[](void* arg) -> void* {
return static_cast<ScopedThread*>(arg)->f_();
},
this) == 0,
"thread creation failed");
}
std::function<void*()> f_;
pthread_t pt_;
bool joined_ = false;
void* retval_ = nullptr;
};
#ifdef __linux__
inline pid_t gettid() { return syscall(SYS_gettid); }
#endif
} // namespace testing
} // namespace gvisor
#endif // GVISOR_TEST_UTIL_THREAD_UTIL_H_
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