94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef GVISOR_TEST_UTIL_THREAD_UTIL_H_
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#define GVISOR_TEST_UTIL_THREAD_UTIL_H_
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#include <pthread.h>
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#ifdef __linux__
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#include <sys/syscall.h>
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#endif
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#include <unistd.h>
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#include <functional>
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#include <utility>
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#include "test/util/logging.h"
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namespace gvisor {
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namespace testing {
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// ScopedThread is a minimal wrapper around pthreads.
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//
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// This is used in lieu of more complex mechanisms because it provides very
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// predictable behavior (no messing with timers, etc.) The thread will
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// automatically joined when it is destructed (goes out of scope), but can be
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// joined manually as well.
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class ScopedThread {
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public:
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// Constructs a thread that executes f exactly once.
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explicit ScopedThread(std::function<void*()> f) : f_(std::move(f)) {
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CreateThread();
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}
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explicit ScopedThread(const std::function<void()>& f) {
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f_ = [=] {
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f();
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return nullptr;
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};
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CreateThread();
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}
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ScopedThread(const ScopedThread& other) = delete;
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ScopedThread& operator=(const ScopedThread& other) = delete;
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// Joins the thread.
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~ScopedThread() { Join(); }
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// Waits until this thread has finished executing. Join is idempotent and may
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// be called multiple times, however Join itself is not thread-safe.
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void* Join() {
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if (!joined_) {
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TEST_PCHECK(pthread_join(pt_, &retval_) == 0);
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joined_ = true;
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}
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return retval_;
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}
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private:
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void CreateThread() {
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TEST_PCHECK_MSG(pthread_create(
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&pt_, /* attr = */ nullptr,
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+[](void* arg) -> void* {
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return static_cast<ScopedThread*>(arg)->f_();
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},
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this) == 0,
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"thread creation failed");
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}
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std::function<void*()> f_;
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pthread_t pt_;
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bool joined_ = false;
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void* retval_ = nullptr;
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};
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#ifdef __linux__
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inline pid_t gettid() { return syscall(SYS_gettid); }
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#endif
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} // namespace testing
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} // namespace gvisor
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#endif // GVISOR_TEST_UTIL_THREAD_UTIL_H_
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