/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsThreadUtils.h"
#include <stdio.h>
#include <stdlib.h>
#include "nspr.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsXPCOM.h"
#include "mozilla/Monitor.h"
#include "gtest/gtest.h"

class nsRunner final : public nsIRunnable {
  ~nsRunner() {}
public:
    NS_DECL_THREADSAFE_ISUPPORTS

    NS_IMETHOD Run() override {
        nsCOMPtr<nsIThread> thread;
        nsresult rv = NS_GetCurrentThread(getter_AddRefs(thread));
        EXPECT_TRUE(NS_SUCCEEDED(rv));
        printf("running %d on thread %p\n", mNum, (void *)thread.get());

        // if we don't do something slow, we'll never see the other
        // worker threads run
        PR_Sleep(PR_MillisecondsToInterval(100));

        return rv;
    }

    explicit nsRunner(int num) : mNum(num) {
    }

protected:
    int mNum;
};

NS_IMPL_ISUPPORTS(nsRunner, nsIRunnable)

TEST(Threads, Main)
{
    nsresult rv;

    nsCOMPtr<nsIRunnable> event = new nsRunner(0);
    EXPECT_TRUE(event);

    nsCOMPtr<nsIThread> runner;
    rv = NS_NewThread(getter_AddRefs(runner), event);
    EXPECT_TRUE(NS_SUCCEEDED(rv));

    nsCOMPtr<nsIThread> thread;
    rv = NS_GetCurrentThread(getter_AddRefs(thread));
    EXPECT_TRUE(NS_SUCCEEDED(rv));

    rv = runner->Shutdown();     // wait for the runner to die before quitting
    EXPECT_TRUE(NS_SUCCEEDED(rv));

    PR_Sleep(PR_MillisecondsToInterval(100));       // hopefully the runner will quit here
}

class nsStressRunner final : public nsIRunnable {
public:
    NS_DECL_THREADSAFE_ISUPPORTS

    NS_IMETHOD Run() override {
        EXPECT_FALSE(mWasRun);
        mWasRun = true;
        PR_Sleep(1);
        if (!PR_AtomicDecrement(&gNum)) {
            printf("   last thread was %d\n", mNum);
        }
        return NS_OK;
    }

    explicit nsStressRunner(int num) : mNum(num), mWasRun(false) {
        PR_AtomicIncrement(&gNum);
    }

    static int32_t GetGlobalCount() {return gNum;}

private:
    ~nsStressRunner() {
        EXPECT_TRUE(mWasRun);
    }

protected:
    static int32_t gNum;
    int32_t mNum;
    bool mWasRun;
};

int32_t nsStressRunner::gNum = 0;

NS_IMPL_ISUPPORTS(nsStressRunner, nsIRunnable)

TEST(Threads, Stress)
{
    const int loops = 1000;
    const int threads = 50;

    for (int i = 0; i < loops; i++) {
        printf("Loop %d of %d\n", i+1, loops);

        int k;
        nsIThread** array = new nsIThread*[threads];

        EXPECT_EQ(nsStressRunner::GetGlobalCount(), 0);

        for (k = 0; k < threads; k++) {
            nsCOMPtr<nsIThread> t;
            nsresult rv = NS_NewThread(getter_AddRefs(t), new nsStressRunner(k));
            EXPECT_TRUE(NS_SUCCEEDED(rv));
            NS_ADDREF(array[k] = t);
        }

        for (k = threads-1; k >= 0; k--) {
            array[k]->Shutdown();
            NS_RELEASE(array[k]);    
        }
        delete [] array;
    }
}

mozilla::Monitor* gAsyncShutdownReadyMonitor;
mozilla::Monitor* gBeginAsyncShutdownMonitor;

class AsyncShutdownPreparer : public nsIRunnable {
public:
    NS_DECL_THREADSAFE_ISUPPORTS

    NS_IMETHOD Run() override {
        EXPECT_FALSE(mWasRun);
        mWasRun = true;

        mozilla::MonitorAutoLock lock(*gAsyncShutdownReadyMonitor);
        lock.Notify();

        return NS_OK;
    }

    explicit AsyncShutdownPreparer() : mWasRun(false) {}

private:
    virtual ~AsyncShutdownPreparer() {
        EXPECT_TRUE(mWasRun);
    }

protected:
    bool mWasRun;
};

NS_IMPL_ISUPPORTS(AsyncShutdownPreparer, nsIRunnable)

class AsyncShutdownWaiter : public nsIRunnable {
public:
    NS_DECL_THREADSAFE_ISUPPORTS

    NS_IMETHOD Run() override {
        EXPECT_FALSE(mWasRun);
        mWasRun = true;

        nsCOMPtr<nsIThread> t;
        nsresult rv;

        {
          mozilla::MonitorAutoLock lock(*gBeginAsyncShutdownMonitor);

          rv = NS_NewThread(getter_AddRefs(t), new AsyncShutdownPreparer());
          EXPECT_TRUE(NS_SUCCEEDED(rv));

          lock.Wait();
        }

        rv = t->AsyncShutdown();
        EXPECT_TRUE(NS_SUCCEEDED(rv));

        return NS_OK;
    }

    explicit AsyncShutdownWaiter() : mWasRun(false) {}

private:
    virtual ~AsyncShutdownWaiter() {
        EXPECT_TRUE(mWasRun);
    }

protected:
    bool mWasRun;
};

NS_IMPL_ISUPPORTS(AsyncShutdownWaiter, nsIRunnable)

class SameThreadSentinel : public nsIRunnable {
public:
    NS_DECL_ISUPPORTS

    NS_IMETHOD Run() override {
        mozilla::MonitorAutoLock lock(*gBeginAsyncShutdownMonitor);
        lock.Notify();
        return NS_OK;
    }

private:
    virtual ~SameThreadSentinel() {}
};

NS_IMPL_ISUPPORTS(SameThreadSentinel, nsIRunnable)

TEST(Threads, AsyncShutdown)
{
  gAsyncShutdownReadyMonitor = new mozilla::Monitor("gAsyncShutdownReady");
  gBeginAsyncShutdownMonitor = new mozilla::Monitor("gBeginAsyncShutdown");

  nsCOMPtr<nsIThread> t;
  nsresult rv;

  {
    mozilla::MonitorAutoLock lock(*gAsyncShutdownReadyMonitor);

    rv = NS_NewThread(getter_AddRefs(t), new AsyncShutdownWaiter());
    EXPECT_TRUE(NS_SUCCEEDED(rv));

    lock.Wait();
  }

  NS_DispatchToCurrentThread(new SameThreadSentinel());
  rv = t->Shutdown();
  EXPECT_TRUE(NS_SUCCEEDED(rv));

  delete gAsyncShutdownReadyMonitor;
  delete gBeginAsyncShutdownMonitor;
}

static void threadProc(void *arg)
{
    // printf("   running thread %d\n", (int) arg);
    PR_Sleep(1);
    EXPECT_EQ(PR_JOINABLE_THREAD, PR_GetThreadState(PR_GetCurrentThread()));
}

TEST(Threads, StressNSPR)
{
    const int loops = 1000;
    const int threads = 50;

    for (int i = 0; i < loops; i++) {
        printf("Loop %d of %d\n", i+1, loops);

        intptr_t k;
        PRThread** array = new PRThread*[threads];

        for (k = 0; k < threads; k++) {
            array[k] = PR_CreateThread(PR_USER_THREAD,
                                       threadProc, (void*) k,
                                       PR_PRIORITY_NORMAL,
                                       PR_GLOBAL_THREAD,
                                       PR_JOINABLE_THREAD,
                                       0);
            EXPECT_TRUE(array[k]);
        }

        for (k = 0; k < threads; k++) {
            EXPECT_EQ(PR_JOINABLE_THREAD, PR_GetThreadState(array[k]));
        }

        for (k = threads-1; k >= 0; k--) {
            PR_JoinThread(array[k]);
        }
        delete [] array;
    }
}
