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// Copyright 2019 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/task/post_job.h"
#include <atomic>
#include <iterator>
#include <numeric>
#include "base/barrier_closure.h"
#include "base/test/bind.h"
#include "base/test/gtest_util.h"
#include "base/test/task_environment.h"
#include "base/test/test_timeouts.h"
#include "base/test/test_waitable_event.h"
#include "base/threading/platform_thread.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
TEST(PostJobTest, PostJobSimple) {
test::TaskEnvironment task_environment;
std::atomic_size_t num_tasks_to_run(4);
auto handle = PostJob(
FROM_HERE, {},
BindLambdaForTesting([&](JobDelegate* delegate) { --num_tasks_to_run; }),
BindLambdaForTesting(
[&](size_t /*worker_count*/) -> size_t { return num_tasks_to_run; }));
handle.Join();
EXPECT_EQ(num_tasks_to_run, 0U);
}
TEST(PostJobTest, CreateJobSimple) {
test::TaskEnvironment task_environment;
std::atomic_size_t num_tasks_to_run(4);
TestWaitableEvent threads_continue;
RepeatingClosure barrier = BarrierClosure(
num_tasks_to_run, BindLambdaForTesting([&threads_continue]() {
threads_continue.Signal();
}));
bool job_started = false;
auto handle =
CreateJob(FROM_HERE, {}, BindLambdaForTesting([&](JobDelegate* delegate) {
EXPECT_TRUE(job_started);
barrier.Run();
threads_continue.Wait();
--num_tasks_to_run;
}),
BindLambdaForTesting([&](size_t /*worker_count*/) -> size_t {
EXPECT_TRUE(job_started);
return num_tasks_to_run;
}));
PlatformThread::Sleep(TestTimeouts::tiny_timeout());
EXPECT_EQ(num_tasks_to_run, 4U);
job_started = true;
handle.Join();
EXPECT_EQ(num_tasks_to_run, 0U);
}
// Verify that concurrent accesses with task_id as the only form of
// synchronisation doesn't trigger a race.
TEST(PostJobTest, TaskIds) {
static constexpr size_t kNumConcurrentThreads = 2;
static constexpr size_t kNumTasksToRun = 1000;
base::test::TaskEnvironment task_environment;
size_t concurrent_array[kNumConcurrentThreads] = {0};
std::atomic_size_t remaining_tasks{kNumTasksToRun};
base::JobHandle handle = base::PostJob(
FROM_HERE, {}, BindLambdaForTesting([&](base::JobDelegate* job) {
uint8_t id = job->GetTaskId();
size_t& slot = concurrent_array[id];
slot++;
--remaining_tasks;
}),
BindLambdaForTesting([&remaining_tasks](size_t) {
return std::min(remaining_tasks.load(), kNumConcurrentThreads);
}));
handle.Join();
EXPECT_EQ(kNumTasksToRun, std::accumulate(std::begin(concurrent_array),
std::end(concurrent_array), 0U));
}
} // namespace base
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