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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.
// NOTE(vtl): Some of these tests are inherently flaky (e.g., if run on a
// heavily-loaded system). Sorry. |test::EpsilonDeadline()| may be increased to
// increase tolerance and reduce observed flakiness (though doing so reduces the
// meaningfulness of the test).
#include "third_party/mojo/src/mojo/edk/system/waiter.h"
#include <stdint.h>
#include "base/threading/simple_thread.h"
#include "mojo/public/cpp/system/macros.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/mojo/src/mojo/edk/system/mutex.h"
#include "third_party/mojo/src/mojo/edk/system/test_utils.h"
namespace mojo {
namespace system {
namespace {
const unsigned kPollTimeMs = 10;
class WaitingThread : public base::SimpleThread {
public:
explicit WaitingThread(MojoDeadline deadline)
: base::SimpleThread("waiting_thread"),
deadline_(deadline),
done_(false),
result_(MOJO_RESULT_UNKNOWN),
context_(static_cast<uintptr_t>(-1)) {
waiter_.Init();
}
~WaitingThread() override { Join(); }
void WaitUntilDone(MojoResult* result,
uintptr_t* context,
MojoDeadline* elapsed) {
for (;;) {
{
MutexLocker locker(&mutex_);
if (done_) {
*result = result_;
*context = context_;
*elapsed = elapsed_;
break;
}
}
test::Sleep(test::DeadlineFromMilliseconds(kPollTimeMs));
}
}
Waiter* waiter() { return &waiter_; }
private:
void Run() override {
test::Stopwatch stopwatch;
MojoResult result;
uintptr_t context = static_cast<uintptr_t>(-1);
MojoDeadline elapsed;
stopwatch.Start();
result = waiter_.Wait(deadline_, &context);
elapsed = stopwatch.Elapsed();
{
MutexLocker locker(&mutex_);
done_ = true;
result_ = result;
context_ = context;
elapsed_ = elapsed;
}
}
const MojoDeadline deadline_;
Waiter waiter_; // Thread-safe.
Mutex mutex_;
bool done_ MOJO_GUARDED_BY(mutex_);
MojoResult result_ MOJO_GUARDED_BY(mutex_);
uintptr_t context_ MOJO_GUARDED_BY(mutex_);
MojoDeadline elapsed_ MOJO_GUARDED_BY(mutex_);
MOJO_DISALLOW_COPY_AND_ASSIGN(WaitingThread);
};
TEST(WaiterTest, Basic) {
MojoResult result;
uintptr_t context;
MojoDeadline elapsed;
// Finite deadline.
// Awake immediately after thread start.
{
WaitingThread thread(10 * test::EpsilonDeadline());
thread.Start();
thread.waiter()->Awake(MOJO_RESULT_OK, 1);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(MOJO_RESULT_OK, result);
EXPECT_EQ(1u, context);
EXPECT_LT(elapsed, test::EpsilonDeadline());
}
// Awake before after thread start.
{
WaitingThread thread(10 * test::EpsilonDeadline());
thread.waiter()->Awake(MOJO_RESULT_CANCELLED, 2);
thread.Start();
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(MOJO_RESULT_CANCELLED, result);
EXPECT_EQ(2u, context);
EXPECT_LT(elapsed, test::EpsilonDeadline());
}
// Awake some time after thread start.
{
WaitingThread thread(10 * test::EpsilonDeadline());
thread.Start();
test::Sleep(2 * test::EpsilonDeadline());
thread.waiter()->Awake(1, 3);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(1u, result);
EXPECT_EQ(3u, context);
EXPECT_GT(elapsed, (2 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (2 + 1) * test::EpsilonDeadline());
}
// Awake some longer time after thread start.
{
WaitingThread thread(10 * test::EpsilonDeadline());
thread.Start();
test::Sleep(5 * test::EpsilonDeadline());
thread.waiter()->Awake(2, 4);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(2u, result);
EXPECT_EQ(4u, context);
EXPECT_GT(elapsed, (5 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (5 + 1) * test::EpsilonDeadline());
}
// Don't awake -- time out (on another thread).
{
WaitingThread thread(2 * test::EpsilonDeadline());
thread.Start();
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, result);
EXPECT_EQ(static_cast<uintptr_t>(-1), context);
EXPECT_GT(elapsed, (2 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (2 + 1) * test::EpsilonDeadline());
}
// No (indefinite) deadline.
// Awake immediately after thread start.
{
WaitingThread thread(MOJO_DEADLINE_INDEFINITE);
thread.Start();
thread.waiter()->Awake(MOJO_RESULT_OK, 5);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(MOJO_RESULT_OK, result);
EXPECT_EQ(5u, context);
EXPECT_LT(elapsed, test::EpsilonDeadline());
}
// Awake before after thread start.
{
WaitingThread thread(MOJO_DEADLINE_INDEFINITE);
thread.waiter()->Awake(MOJO_RESULT_CANCELLED, 6);
thread.Start();
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(MOJO_RESULT_CANCELLED, result);
EXPECT_EQ(6u, context);
EXPECT_LT(elapsed, test::EpsilonDeadline());
}
// Awake some time after thread start.
{
WaitingThread thread(MOJO_DEADLINE_INDEFINITE);
thread.Start();
test::Sleep(2 * test::EpsilonDeadline());
thread.waiter()->Awake(1, 7);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(1u, result);
EXPECT_EQ(7u, context);
EXPECT_GT(elapsed, (2 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (2 + 1) * test::EpsilonDeadline());
}
// Awake some longer time after thread start.
{
WaitingThread thread(MOJO_DEADLINE_INDEFINITE);
thread.Start();
test::Sleep(5 * test::EpsilonDeadline());
thread.waiter()->Awake(2, 8);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(2u, result);
EXPECT_EQ(8u, context);
EXPECT_GT(elapsed, (5 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (5 + 1) * test::EpsilonDeadline());
}
}
TEST(WaiterTest, TimeOut) {
test::Stopwatch stopwatch;
MojoDeadline elapsed;
Waiter waiter;
uintptr_t context = 123;
waiter.Init();
stopwatch.Start();
EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, &context));
elapsed = stopwatch.Elapsed();
EXPECT_LT(elapsed, test::EpsilonDeadline());
EXPECT_EQ(123u, context);
waiter.Init();
stopwatch.Start();
EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED,
waiter.Wait(2 * test::EpsilonDeadline(), &context));
elapsed = stopwatch.Elapsed();
EXPECT_GT(elapsed, (2 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (2 + 1) * test::EpsilonDeadline());
EXPECT_EQ(123u, context);
waiter.Init();
stopwatch.Start();
EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED,
waiter.Wait(5 * test::EpsilonDeadline(), &context));
elapsed = stopwatch.Elapsed();
EXPECT_GT(elapsed, (5 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (5 + 1) * test::EpsilonDeadline());
EXPECT_EQ(123u, context);
}
// The first |Awake()| should always win.
TEST(WaiterTest, MultipleAwakes) {
MojoResult result;
uintptr_t context;
MojoDeadline elapsed;
{
WaitingThread thread(MOJO_DEADLINE_INDEFINITE);
thread.Start();
thread.waiter()->Awake(MOJO_RESULT_OK, 1);
thread.waiter()->Awake(1, 2);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(MOJO_RESULT_OK, result);
EXPECT_EQ(1u, context);
EXPECT_LT(elapsed, test::EpsilonDeadline());
}
{
WaitingThread thread(MOJO_DEADLINE_INDEFINITE);
thread.waiter()->Awake(1, 3);
thread.Start();
thread.waiter()->Awake(MOJO_RESULT_OK, 4);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(1u, result);
EXPECT_EQ(3u, context);
EXPECT_LT(elapsed, test::EpsilonDeadline());
}
{
WaitingThread thread(MOJO_DEADLINE_INDEFINITE);
thread.Start();
thread.waiter()->Awake(10, 5);
test::Sleep(2 * test::EpsilonDeadline());
thread.waiter()->Awake(20, 6);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(10u, result);
EXPECT_EQ(5u, context);
EXPECT_LT(elapsed, test::EpsilonDeadline());
}
{
WaitingThread thread(10 * test::EpsilonDeadline());
thread.Start();
test::Sleep(1 * test::EpsilonDeadline());
thread.waiter()->Awake(MOJO_RESULT_FAILED_PRECONDITION, 7);
test::Sleep(2 * test::EpsilonDeadline());
thread.waiter()->Awake(MOJO_RESULT_OK, 8);
thread.WaitUntilDone(&result, &context, &elapsed);
EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, result);
EXPECT_EQ(7u, context);
EXPECT_GT(elapsed, (1 - 1) * test::EpsilonDeadline());
EXPECT_LT(elapsed, (1 + 1) * test::EpsilonDeadline());
}
}
} // namespace
} // namespace system
} // namespace mojo
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