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// Copyright 2013 The Chromium Authors
// 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/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/raw_ptr.h"
#include "base/test/bind.h"
#include "base/test/gtest_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
TEST(BarrierClosureTest, RunImmediatelyForZeroClosures) {
int count = 0;
base::RepeatingClosure barrier_closure = base::BarrierClosure(
0, base::BindLambdaForTesting([&count] { ++count; }));
EXPECT_EQ(1, count);
}
TEST(BarrierClosureTest, ChecksIfCalledForZeroClosures) {
base::RepeatingClosure barrier_closure =
base::BarrierClosure(0, base::DoNothing());
EXPECT_FALSE(barrier_closure.is_null());
EXPECT_NOTREACHED_DEATH(barrier_closure.Run());
}
TEST(BarrierClosureTest, RunAfterNumClosures) {
int count = 0;
base::RepeatingClosure barrier_closure = base::BarrierClosure(
2, base::BindLambdaForTesting([&count] { ++count; }));
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.
explicit DestructionIndicator(bool* destructed) : destructed_(destructed) {
*destructed_ = false;
}
~DestructionIndicator() { *destructed_ = true; }
void DoNothing() {}
private:
raw_ptr<bool> destructed_;
};
TEST(BarrierClosureTest, ReleasesDoneClosureWhenDone) {
bool done_destructed = false;
base::RepeatingClosure barrier_closure = base::BarrierClosure(
1,
base::BindOnce(&DestructionIndicator::DoNothing,
base::Owned(new DestructionIndicator(&done_destructed))));
EXPECT_FALSE(done_destructed);
barrier_closure.Run();
EXPECT_TRUE(done_destructed);
}
// Tests a case when |done_closure| resets a |barrier_closure|.
// |barrier_closure| is a RepeatingClosure 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::RepeatingClosure barrier_closure;
barrier_closure =
base::BarrierClosure(1, base::BindLambdaForTesting([&barrier_closure] {
barrier_closure = base::RepeatingClosure();
}));
barrier_closure.Run();
EXPECT_TRUE(barrier_closure.is_null());
}
} // namespace
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