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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Author: kenton@google.com (Kenton Varda)
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#include <pthread.h>
#endif
#include <google/protobuf/stubs/once.h>
#include <google/protobuf/testing/googletest.h>
#include <gtest/gtest.h>
namespace google {
namespace protobuf {
namespace {
class OnceInitTest : public testing::Test {
protected:
void SetUp() {
state_ = INIT_NOT_STARTED;
current_test_ = this;
}
// Since ProtobufOnceType is only allowed to be allocated in static storage,
// each test must use a different pair of ProtobufOnceType objects which it
// must declare itself.
void SetOnces(ProtobufOnceType* once, ProtobufOnceType* recursive_once) {
once_ = once;
recursive_once_ = recursive_once;
}
void InitOnce() {
GoogleOnceInit(once_, &InitStatic);
}
void InitRecursiveOnce() {
GoogleOnceInit(recursive_once_, &InitRecursiveStatic);
}
void BlockInit() { init_blocker_.Lock(); }
void UnblockInit() { init_blocker_.Unlock(); }
class TestThread {
public:
TestThread(Closure* callback)
: done_(false), joined_(false), callback_(callback) {
#ifdef _WIN32
thread_ = CreateThread(NULL, 0, &Start, this, 0, NULL);
#else
pthread_create(&thread_, NULL, &Start, this);
#endif
}
~TestThread() {
if (!joined_) Join();
}
bool IsDone() {
MutexLock lock(&done_mutex_);
return done_;
}
void Join() {
joined_ = true;
#ifdef _WIN32
WaitForSingleObject(thread_, INFINITE);
CloseHandle(thread_);
#else
pthread_join(thread_, NULL);
#endif
}
private:
#ifdef _WIN32
HANDLE thread_;
#else
pthread_t thread_;
#endif
Mutex done_mutex_;
bool done_;
bool joined_;
Closure* callback_;
#ifdef _WIN32
static DWORD WINAPI Start(LPVOID arg) {
#else
static void* Start(void* arg) {
#endif
reinterpret_cast<TestThread*>(arg)->Run();
return 0;
}
void Run() {
callback_->Run();
MutexLock lock(&done_mutex_);
done_ = true;
}
};
TestThread* RunInitOnceInNewThread() {
return new TestThread(NewCallback(this, &OnceInitTest::InitOnce));
}
TestThread* RunInitRecursiveOnceInNewThread() {
return new TestThread(NewCallback(this, &OnceInitTest::InitRecursiveOnce));
}
enum State {
INIT_NOT_STARTED,
INIT_STARTED,
INIT_DONE
};
State CurrentState() {
MutexLock lock(&mutex_);
return state_;
}
void WaitABit() {
#ifdef _WIN32
Sleep(1000);
#else
sleep(1);
#endif
}
private:
Mutex mutex_;
Mutex init_blocker_;
State state_;
ProtobufOnceType* once_;
ProtobufOnceType* recursive_once_;
void Init() {
MutexLock lock(&mutex_);
EXPECT_EQ(INIT_NOT_STARTED, state_);
state_ = INIT_STARTED;
mutex_.Unlock();
init_blocker_.Lock();
init_blocker_.Unlock();
mutex_.Lock();
state_ = INIT_DONE;
}
static OnceInitTest* current_test_;
static void InitStatic() { current_test_->Init(); }
static void InitRecursiveStatic() { current_test_->InitOnce(); }
};
OnceInitTest* OnceInitTest::current_test_ = NULL;
GOOGLE_PROTOBUF_DECLARE_ONCE(simple_once);
TEST_F(OnceInitTest, Simple) {
SetOnces(&simple_once, NULL);
EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
InitOnce();
EXPECT_EQ(INIT_DONE, CurrentState());
// Calling again has no effect.
InitOnce();
EXPECT_EQ(INIT_DONE, CurrentState());
}
GOOGLE_PROTOBUF_DECLARE_ONCE(recursive_once1);
GOOGLE_PROTOBUF_DECLARE_ONCE(recursive_once2);
TEST_F(OnceInitTest, Recursive) {
SetOnces(&recursive_once1, &recursive_once2);
EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
InitRecursiveOnce();
EXPECT_EQ(INIT_DONE, CurrentState());
}
GOOGLE_PROTOBUF_DECLARE_ONCE(multiple_threads_once);
TEST_F(OnceInitTest, MultipleThreads) {
SetOnces(&multiple_threads_once, NULL);
scoped_ptr<TestThread> threads[4];
EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
for (int i = 0; i < 4; i++) {
threads[i].reset(RunInitOnceInNewThread());
}
for (int i = 0; i < 4; i++) {
threads[i]->Join();
}
EXPECT_EQ(INIT_DONE, CurrentState());
}
GOOGLE_PROTOBUF_DECLARE_ONCE(multiple_threads_blocked_once1);
GOOGLE_PROTOBUF_DECLARE_ONCE(multiple_threads_blocked_once2);
TEST_F(OnceInitTest, MultipleThreadsBlocked) {
SetOnces(&multiple_threads_blocked_once1, &multiple_threads_blocked_once2);
scoped_ptr<TestThread> threads[8];
EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
BlockInit();
for (int i = 0; i < 4; i++) {
threads[i].reset(RunInitOnceInNewThread());
}
for (int i = 4; i < 8; i++) {
threads[i].reset(RunInitRecursiveOnceInNewThread());
}
WaitABit();
// We should now have one thread blocked inside Init(), four blocked waiting
// for Init() to complete, and three blocked waiting for InitRecursive() to
// complete.
EXPECT_EQ(INIT_STARTED, CurrentState());
UnblockInit();
for (int i = 0; i < 8; i++) {
threads[i]->Join();
}
EXPECT_EQ(INIT_DONE, CurrentState());
}
} // anonymous namespace
} // namespace protobuf
} // namespace google
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