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// Copyright (c) 2012 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/atomic_sequence_num.h"
#include "base/strings/string_number_conversions.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/simple_thread.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
class SetIntRunner : public DelegateSimpleThread::Delegate {
public:
SetIntRunner(int* ptr, int val) : ptr_(ptr), val_(val) { }
~SetIntRunner() override {}
void Run() override { *ptr_ = val_; }
private:
int* ptr_;
int val_;
};
class WaitEventRunner : public DelegateSimpleThread::Delegate {
public:
explicit WaitEventRunner(WaitableEvent* event) : event_(event) { }
~WaitEventRunner() override {}
void Run() override {
EXPECT_FALSE(event_->IsSignaled());
event_->Signal();
EXPECT_TRUE(event_->IsSignaled());
}
private:
WaitableEvent* event_;
};
class SeqRunner : public DelegateSimpleThread::Delegate {
public:
explicit SeqRunner(AtomicSequenceNumber* seq) : seq_(seq) { }
void Run() override { seq_->GetNext(); }
private:
AtomicSequenceNumber* seq_;
};
// We count up on a sequence number, firing on the event when we've hit our
// expected amount, otherwise we wait on the event. This will ensure that we
// have all threads outstanding until we hit our expected thread pool size.
class VerifyPoolRunner : public DelegateSimpleThread::Delegate {
public:
VerifyPoolRunner(AtomicSequenceNumber* seq,
int total, WaitableEvent* event)
: seq_(seq), total_(total), event_(event) { }
void Run() override {
if (seq_->GetNext() == total_) {
event_->Signal();
} else {
event_->Wait();
}
}
private:
AtomicSequenceNumber* seq_;
int total_;
WaitableEvent* event_;
};
} // namespace
TEST(SimpleThreadTest, CreateAndJoin) {
int stack_int = 0;
SetIntRunner runner(&stack_int, 7);
EXPECT_EQ(0, stack_int);
DelegateSimpleThread thread(&runner, "int_setter");
EXPECT_FALSE(thread.HasBeenStarted());
EXPECT_FALSE(thread.HasBeenJoined());
EXPECT_EQ(0, stack_int);
thread.Start();
EXPECT_TRUE(thread.HasBeenStarted());
EXPECT_FALSE(thread.HasBeenJoined());
thread.Join();
EXPECT_TRUE(thread.HasBeenStarted());
EXPECT_TRUE(thread.HasBeenJoined());
EXPECT_EQ(7, stack_int);
}
TEST(SimpleThreadTest, WaitForEvent) {
// Create a thread, and wait for it to signal us.
WaitableEvent event(true, false);
WaitEventRunner runner(&event);
DelegateSimpleThread thread(&runner, "event_waiter");
EXPECT_FALSE(event.IsSignaled());
thread.Start();
event.Wait();
EXPECT_TRUE(event.IsSignaled());
thread.Join();
}
TEST(SimpleThreadTest, NamedWithOptions) {
WaitableEvent event(true, false);
WaitEventRunner runner(&event);
SimpleThread::Options options;
DelegateSimpleThread thread(&runner, "event_waiter", options);
EXPECT_EQ(thread.name_prefix(), "event_waiter");
EXPECT_FALSE(event.IsSignaled());
thread.Start();
EXPECT_EQ(thread.name_prefix(), "event_waiter");
EXPECT_EQ(thread.name(),
std::string("event_waiter/") + IntToString(thread.tid()));
event.Wait();
EXPECT_TRUE(event.IsSignaled());
thread.Join();
// We keep the name and tid, even after the thread is gone.
EXPECT_EQ(thread.name_prefix(), "event_waiter");
EXPECT_EQ(thread.name(),
std::string("event_waiter/") + IntToString(thread.tid()));
}
TEST(SimpleThreadTest, ThreadPool) {
AtomicSequenceNumber seq;
SeqRunner runner(&seq);
DelegateSimpleThreadPool pool("seq_runner", 10);
// Add work before we're running.
pool.AddWork(&runner, 300);
EXPECT_EQ(seq.GetNext(), 0);
pool.Start();
// Add work while we're running.
pool.AddWork(&runner, 300);
pool.JoinAll();
EXPECT_EQ(seq.GetNext(), 601);
// We can reuse our pool. Verify that all 10 threads can actually run in
// parallel, so this test will only pass if there are actually 10 threads.
AtomicSequenceNumber seq2;
WaitableEvent event(true, false);
// Changing 9 to 10, for example, would cause us JoinAll() to never return.
VerifyPoolRunner verifier(&seq2, 9, &event);
pool.Start();
pool.AddWork(&verifier, 10);
pool.JoinAll();
EXPECT_EQ(seq2.GetNext(), 10);
}
} // namespace base
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