v8/test/cctest/test-semaphore.cc

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// Copyright 2013 the V8 project authors. All rights reserved.
// 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.
#include <stdlib.h>
#include "src/v8.h"
#include "src/base/platform/platform.h"
#include "test/cctest/cctest.h"
using namespace ::v8::internal;
class WaitAndSignalThread V8_FINAL : public v8::base::Thread {
public:
explicit WaitAndSignalThread(v8::base::Semaphore* semaphore)
: Thread("WaitAndSignalThread"), semaphore_(semaphore) {}
virtual ~WaitAndSignalThread() {}
virtual void Run() V8_OVERRIDE {
for (int n = 0; n < 1000; ++n) {
semaphore_->Wait();
bool result =
semaphore_->WaitFor(v8::base::TimeDelta::FromMicroseconds(1));
DCHECK(!result);
USE(result);
semaphore_->Signal();
}
}
private:
v8::base::Semaphore* semaphore_;
};
TEST(WaitAndSignal) {
v8::base::Semaphore semaphore(0);
WaitAndSignalThread t1(&semaphore);
WaitAndSignalThread t2(&semaphore);
t1.Start();
t2.Start();
// Make something available.
semaphore.Signal();
t1.Join();
t2.Join();
semaphore.Wait();
bool result = semaphore.WaitFor(v8::base::TimeDelta::FromMicroseconds(1));
DCHECK(!result);
USE(result);
}
TEST(WaitFor) {
bool ok;
v8::base::Semaphore semaphore(0);
// Semaphore not signalled - timeout.
ok = semaphore.WaitFor(v8::base::TimeDelta::FromMicroseconds(0));
CHECK(!ok);
ok = semaphore.WaitFor(v8::base::TimeDelta::FromMicroseconds(100));
CHECK(!ok);
ok = semaphore.WaitFor(v8::base::TimeDelta::FromMicroseconds(1000));
CHECK(!ok);
// Semaphore signalled - no timeout.
semaphore.Signal();
ok = semaphore.WaitFor(v8::base::TimeDelta::FromMicroseconds(0));
CHECK(ok);
semaphore.Signal();
ok = semaphore.WaitFor(v8::base::TimeDelta::FromMicroseconds(100));
CHECK(ok);
semaphore.Signal();
ok = semaphore.WaitFor(v8::base::TimeDelta::FromMicroseconds(1000));
CHECK(ok);
}
static const char alphabet[] = "XKOAD";
static const int kAlphabetSize = sizeof(alphabet) - 1;
static const int kBufferSize = 4096; // GCD(buffer size, alphabet size) = 1
static char buffer[kBufferSize];
static const int kDataSize = kBufferSize * kAlphabetSize * 10;
static v8::base::Semaphore free_space(kBufferSize);
static v8::base::Semaphore used_space(0);
class ProducerThread V8_FINAL : public v8::base::Thread {
public:
ProducerThread() : Thread("ProducerThread") {}
virtual ~ProducerThread() {}
virtual void Run() V8_OVERRIDE {
for (int n = 0; n < kDataSize; ++n) {
free_space.Wait();
buffer[n % kBufferSize] = alphabet[n % kAlphabetSize];
used_space.Signal();
}
}
};
class ConsumerThread V8_FINAL : public v8::base::Thread {
public:
ConsumerThread() : Thread("ConsumerThread") {}
virtual ~ConsumerThread() {}
virtual void Run() V8_OVERRIDE {
for (int n = 0; n < kDataSize; ++n) {
used_space.Wait();
DCHECK_EQ(static_cast<int>(alphabet[n % kAlphabetSize]),
static_cast<int>(buffer[n % kBufferSize]));
free_space.Signal();
}
}
};
TEST(ProducerConsumer) {
ProducerThread producer_thread;
ConsumerThread consumer_thread;
producer_thread.Start();
consumer_thread.Start();
producer_thread.Join();
consumer_thread.Join();
}