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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 "base/barrier_closure.h"
#include "base/bind.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
void Increment(int* count) { (*count)++; }
TEST(BarrierClosureTest, RunImmediatelyForZeroClosures) {
int count = 0;
base::Closure done_closure(base::Bind(&Increment, base::Unretained(&count)));
base::Closure barrier_closure = base::BarrierClosure(0, done_closure);
EXPECT_EQ(1, count);
}
TEST(BarrierClosureTest, RunAfterNumClosures) {
int count = 0;
base::Closure done_closure(base::Bind(&Increment, base::Unretained(&count)));
base::Closure barrier_closure = base::BarrierClosure(2, done_closure);
EXPECT_EQ(0, count);
barrier_closure.Run();
EXPECT_EQ(0, count);
barrier_closure.Run();
EXPECT_EQ(1, count);
}
class DestructionIndicator {
public:
// Sets |*destructed| to true in destructor.
DestructionIndicator(bool* destructed) : destructed_(destructed) {
*destructed_ = false;
}
~DestructionIndicator() { *destructed_ = true; }
void DoNothing() {}
private:
bool* destructed_;
};
TEST(BarrierClosureTest, ReleasesDoneClosureWhenDone) {
bool done_destructed = false;
base::Closure barrier_closure = base::BarrierClosure(
1, base::Bind(&DestructionIndicator::DoNothing,
base::Owned(new DestructionIndicator(&done_destructed))));
EXPECT_FALSE(done_destructed);
barrier_closure.Run();
EXPECT_TRUE(done_destructed);
}
void ResetBarrierClosure(base::Closure* closure) {
*closure = base::Closure();
}
// Tests a case when |done_closure| resets a |barrier_closure|.
// |barrier_closure| is a Closure holding the |done_closure|. |done_closure|
// holds a pointer back to the |barrier_closure|. When |barrier_closure| is
// Run() it calls ResetBarrierClosure() which erases the |barrier_closure| while
// still inside of its Run(). The Run() implementation (in base::BarrierClosure)
// must not try use itself after executing ResetBarrierClosure() or this test
// would crash inside Run().
TEST(BarrierClosureTest, KeepingClosureAliveUntilDone) {
base::Closure barrier_closure;
base::Closure done_closure =
base::Bind(ResetBarrierClosure, &barrier_closure);
barrier_closure = base::BarrierClosure(1, done_closure);
barrier_closure.Run();
}
} // namespace
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