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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/system/dispatcher.h"
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/simple_thread.h"
#include "mojo/system/waiter.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace mojo {
namespace system {
namespace {
// Trivial subclass that makes the constructor public.
class TrivialDispatcher : public Dispatcher {
public:
TrivialDispatcher() {}
private:
friend class base::RefCountedThreadSafe<TrivialDispatcher>;
virtual ~TrivialDispatcher() {}
DISALLOW_COPY_AND_ASSIGN(TrivialDispatcher);
};
TEST(DispatcherTest, Basic) {
scoped_refptr<Dispatcher> d(new TrivialDispatcher());
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
d->WriteMessage(NULL, 0, NULL, MOJO_WRITE_MESSAGE_FLAG_NONE));
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
d->ReadMessage(NULL, NULL, 0, NULL,
MOJO_WRITE_MESSAGE_FLAG_NONE));
Waiter w;
w.Init();
EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
d->AddWaiter(&w, MOJO_WAIT_FLAG_EVERYTHING, 0));
// Okay to remove even if it wasn't added (or was already removed).
d->RemoveWaiter(&w);
d->RemoveWaiter(&w);
EXPECT_EQ(MOJO_RESULT_OK, d->Close());
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
d->WriteMessage(NULL, 0, NULL, MOJO_WRITE_MESSAGE_FLAG_NONE));
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
d->ReadMessage(NULL, NULL, 0, NULL,
MOJO_WRITE_MESSAGE_FLAG_NONE));
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
d->AddWaiter(&w, MOJO_WAIT_FLAG_EVERYTHING, 0));
d->RemoveWaiter(&w);
}
class ThreadSafetyStressThread : public base::SimpleThread {
public:
enum DispatcherOp {
CLOSE = 0,
WRITE_MESSAGE,
READ_MESSAGE,
ADD_WAITER,
REMOVE_WAITER,
DISPATCHER_OP_COUNT
};
ThreadSafetyStressThread(base::WaitableEvent* event,
scoped_refptr<Dispatcher> dispatcher,
DispatcherOp op)
: base::SimpleThread("thread_safety_stress_thread"),
event_(event),
dispatcher_(dispatcher),
op_(op) {
CHECK_LE(0, op_);
CHECK_LT(op_, DISPATCHER_OP_COUNT);
}
virtual ~ThreadSafetyStressThread() {
Join();
}
private:
virtual void Run() OVERRIDE {
event_->Wait();
waiter_.Init();
switch(op_) {
case CLOSE: {
MojoResult r = dispatcher_->Close();
EXPECT_TRUE(r == MOJO_RESULT_OK || r == MOJO_RESULT_INVALID_ARGUMENT)
<< "Result: " << r;
break;
}
case WRITE_MESSAGE:
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
dispatcher_->WriteMessage(NULL, 0, NULL,
MOJO_WRITE_MESSAGE_FLAG_NONE));
break;
case READ_MESSAGE:
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
dispatcher_->ReadMessage(NULL, NULL, 0, NULL,
MOJO_WRITE_MESSAGE_FLAG_NONE));
break;
case ADD_WAITER: {
MojoResult r = dispatcher_->AddWaiter(&waiter_,
MOJO_WAIT_FLAG_EVERYTHING, 0);
EXPECT_TRUE(r == MOJO_RESULT_FAILED_PRECONDITION ||
r == MOJO_RESULT_INVALID_ARGUMENT);
break;
}
case REMOVE_WAITER:
dispatcher_->RemoveWaiter(&waiter_);
break;
default:
NOTREACHED();
break;
}
// Always try to remove the waiter, in case we added it.
dispatcher_->RemoveWaiter(&waiter_);
}
base::WaitableEvent* const event_;
const scoped_refptr<Dispatcher> dispatcher_;
const DispatcherOp op_;
Waiter waiter_;
DISALLOW_COPY_AND_ASSIGN(ThreadSafetyStressThread);
};
TEST(DispatcherTest, ThreadSafetyStress) {
static const size_t kRepeatCount = 20;
static const size_t kNumThreads = 100;
for (size_t i = 0; i < kRepeatCount; i++) {
// Manual reset, not initially signalled.
base::WaitableEvent event(true, false);
scoped_refptr<Dispatcher> d(new TrivialDispatcher());
{
ScopedVector<ThreadSafetyStressThread> threads;
for (size_t j = 0; j < kNumThreads; j++) {
ThreadSafetyStressThread::DispatcherOp op =
static_cast<ThreadSafetyStressThread::DispatcherOp>(
(i+j) % ThreadSafetyStressThread::DISPATCHER_OP_COUNT);
threads.push_back(new ThreadSafetyStressThread(&event, d, op));
threads.back()->Start();
}
event.Signal(); // Kicks off real work on the threads.
} // Joins all the threads.
// One of the threads should already have closed the dispatcher.
EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, d->Close());
}
}
TEST(DispatcherTest, ThreadSafetyStressNoClose) {
static const size_t kRepeatCount = 20;
static const size_t kNumThreads = 100;
for (size_t i = 0; i < kRepeatCount; i++) {
// Manual reset, not initially signalled.
base::WaitableEvent event(true, false);
scoped_refptr<Dispatcher> d(new TrivialDispatcher());
{
ScopedVector<ThreadSafetyStressThread> threads;
for (size_t j = 0; j < kNumThreads; j++) {
ThreadSafetyStressThread::DispatcherOp op =
static_cast<ThreadSafetyStressThread::DispatcherOp>(
(i+j) % (ThreadSafetyStressThread::DISPATCHER_OP_COUNT-1) + 1);
threads.push_back(new ThreadSafetyStressThread(&event, d, op));
threads.back()->Start();
}
event.Signal(); // Kicks off real work on the threads.
} // Joins all the threads.
EXPECT_EQ(MOJO_RESULT_OK, d->Close());
}
}
} // namespace
} // namespace system
} // namespace mojo
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