Tools/TestWebKitAPI/Tests/WTF/SuspendableWorkQueue.cpp

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#include "config.h"
#include <wtf/SuspendableWorkQueue.h>

#include "Test.h"
#include "Utilities.h"
#include <wtf/Lock.h>

namespace TestWebKitAPI {

TEST(WTF_SuspendableWorkQueue, Suspend)
{
    Lock lock;
    int taskCount = 100;
    int completedTaskCount = 0;
    bool allTasksCompleted = false;
    bool suspended = false;
    bool suspendCompletionHandlerCalled = false;
    auto queue = SuspendableWorkQueue::create("com.apple.WebKit.Test.simple");
    for (int i = 0; i < taskCount; i ++) {
        queue->dispatch([&]() mutable {
            Locker locker { lock };
            suspended = false;
            ++completedTaskCount;
            if (completedTaskCount == taskCount)
                allTasksCompleted = true;
        });
    }
    queue->suspend([&] {
        Locker locker { lock };
        suspended = true;
    }, [&] {
        suspendCompletionHandlerCalled = true;
    });
    Util::run(&suspendCompletionHandlerCalled);
    {
        Locker locker { lock };
        EXPECT_LE(completedTaskCount, taskCount);
        EXPECT_TRUE(suspended);
    }

    queue->resume();
    Util::run(&allTasksCompleted);
    Locker locker { lock };
    EXPECT_EQ(completedTaskCount, taskCount);
    EXPECT_FALSE(suspended);
}

TEST(WTF_SuspendableWorkQueue, SuspendTwice)
{
    Lock lock;
    bool suspendCompletionHandlerCalled = false;
    int suspendCount = 0;
    auto queue = SuspendableWorkQueue::create("com.apple.WebKit.Test.simple");
    queue->suspend([&]() {
        Locker locker { lock };
        ++suspendCount;
    }, [&] {
        suspendCompletionHandlerCalled = true;
    });
    Util::run(&suspendCompletionHandlerCalled);
    {
        Locker locker { lock };
        EXPECT_EQ(1, suspendCount);
    }
    
    suspendCompletionHandlerCalled = false;
    queue->suspend([&]() {
        Locker locker { lock };
        ++suspendCount;
    }, [&] {
        suspendCompletionHandlerCalled = true;
    });
    Util::run(&suspendCompletionHandlerCalled);
    Locker locker { lock };
    EXPECT_EQ(1, suspendCount);
}

} // namesapce TestWebKitAPI