1 files changed, 210 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestThreadPool.cpp b/xpcom/tests/gtest/TestThreadPool.cpp
new file mode 100644
index 0000000000..eefcfaca64
--- /dev/null
+++ b/xpcom/tests/gtest/TestThreadPool.cpp
@@ -0,0 +1,210 @@
+/* -*- 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 <stdio.h>
+#include <stdlib.h>
+#include "nsXPCOM.h"
+#include "nsXPCOMCIDInternal.h"
+#include "nsThreadPool.h"
+#include "nsComponentManagerUtils.h"
+#include "nsCOMPtr.h"
+#include "nsIRunnable.h"
+#include "nsThreadUtils.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Monitor.h"
+#include "gtest/gtest.h"
+
+using namespace mozilla;
+
+class TestTask final : public Runnable {
+ public:
+  TestTask(int i, Atomic<int>& aCounter)
+      : Runnable("TestThreadPool::Task"), mIndex(i), mCounter(aCounter) {}
+
+  NS_IMETHOD Run() override {
+    printf("###(%d) running from thread: %p\n", mIndex,
+           (void*)PR_GetCurrentThread());
+    int r = (int)((float)rand() * 200 / float(RAND_MAX));
+    PR_Sleep(PR_MillisecondsToInterval(r));
+    printf("###(%d) exiting from thread: %p\n", mIndex,
+           (void*)PR_GetCurrentThread());
+    ++mCounter;
+    return NS_OK;
+  }
+
+ private:
+  ~TestTask() = default;
+
+  int mIndex;
+  Atomic<int>& mCounter;
+};
+
+TEST(ThreadPool, Main)
+{
+  nsCOMPtr<nsIThreadPool> pool = new nsThreadPool();
+
+  Atomic<int> count(0);
+
+  for (int i = 0; i < 100; ++i) {
+    nsCOMPtr<nsIRunnable> task = new TestTask(i, count);
+    EXPECT_TRUE(task);
+
+    pool->Dispatch(task, NS_DISPATCH_NORMAL);
+  }
+
+  pool->Shutdown();
+  EXPECT_EQ(count, 100);
+}
+
+TEST(ThreadPool, Parallelism)
+{
+  nsCOMPtr<nsIThreadPool> pool = new nsThreadPool();
+
+  // Dispatch and sleep to ensure we have an idle thread
+  nsCOMPtr<nsIRunnable> r0 = new Runnable("TestRunnable");
+  pool->Dispatch(r0, NS_DISPATCH_SYNC);
+  PR_Sleep(PR_SecondsToInterval(2));
+
+  class Runnable1 : public Runnable {
+   public:
+    Runnable1(Monitor& aMonitor, bool& aDone)
+        : mozilla::Runnable("Runnable1"), mMonitor(aMonitor), mDone(aDone) {}
+
+    NS_IMETHOD Run() override {
+      MonitorAutoLock mon(mMonitor);
+      if (!mDone) {
+        // Wait for a reasonable timeout since we don't want to block gtests
+        // forever should any regression happen.
+        mon.Wait(TimeDuration::FromSeconds(300));
+      }
+      EXPECT_TRUE(mDone);
+      return NS_OK;
+    }
+
+   private:
+    Monitor& mMonitor;
+    bool& mDone;
+  };
+
+  class Runnable2 : public Runnable {
+   public:
+    Runnable2(Monitor& aMonitor, bool& aDone)
+        : mozilla::Runnable("Runnable2"), mMonitor(aMonitor), mDone(aDone) {}
+
+    NS_IMETHOD Run() override {
+      MonitorAutoLock mon(mMonitor);
+      mDone = true;
+      mon.NotifyAll();
+      return NS_OK;
+    }
+
+   private:
+    Monitor& mMonitor;
+    bool& mDone;
+  };
+
+  // Dispatch 2 events in a row. Since we are still within the thread limit,
+  // We should wake up the idle thread and spawn a new thread so these 2 events
+  // can run in parallel. We will time out if r1 and r2 run in sequence for r1
+  // won't finish until r2 finishes.
+  Monitor mon MOZ_UNANNOTATED("ThreadPool::Parallelism");
+  bool done = false;
+  nsCOMPtr<nsIRunnable> r1 = new Runnable1(mon, done);
+  nsCOMPtr<nsIRunnable> r2 = new Runnable2(mon, done);
+  pool->Dispatch(r1, NS_DISPATCH_NORMAL);
+  pool->Dispatch(r2, NS_DISPATCH_NORMAL);
+
+  pool->Shutdown();
+}
+
+TEST(ThreadPool, ShutdownWithTimeout)
+{
+  nsCOMPtr<nsIThreadPool> pool = new nsThreadPool();
+
+  Atomic<int> allThreadsCount(0);
+  for (int i = 0; i < 4; ++i) {
+    nsCOMPtr<nsIRunnable> task = new TestTask(i, allThreadsCount);
+    EXPECT_TRUE(task);
+
+    pool->Dispatch(task, NS_DISPATCH_NORMAL);
+  }
+
+  // Wait for a max of 350 ms. All threads should be done by then.
+  pool->ShutdownWithTimeout(350);
+  EXPECT_EQ(allThreadsCount, 4);
+
+  Atomic<int> infiniteLoopCount(0);
+  Atomic<bool> shutdownInfiniteLoop(false);
+  Atomic<bool> shutdownAck(false);
+  pool = new nsThreadPool();
+  for (int i = 0; i < 3; ++i) {
+    nsCOMPtr<nsIRunnable> task = new TestTask(i, infiniteLoopCount);
+    EXPECT_TRUE(task);
+
+    pool->Dispatch(task, NS_DISPATCH_NORMAL);
+  }
+
+  pool->Dispatch(NS_NewRunnableFunction(
+                     "infinite-loop",
+                     [&shutdownInfiniteLoop, &shutdownAck]() {
+                       printf("### running from thread that never ends: %p\n",
+                              (void*)PR_GetCurrentThread());
+                       while (!shutdownInfiniteLoop) {
+                         PR_Sleep(PR_MillisecondsToInterval(100));
+                       }
+                       shutdownAck = true;
+                     }),
+                 NS_DISPATCH_NORMAL);
+
+  pool->ShutdownWithTimeout(1000);
+  EXPECT_EQ(infiniteLoopCount, 3);
+
+  shutdownInfiniteLoop = true;
+  while (!shutdownAck) {
+    /* nothing */
+  }
+}
+
+TEST(ThreadPool, ShutdownWithTimeoutThenSleep)
+{
+  Atomic<int> count(0);
+  nsCOMPtr<nsIThreadPool> pool = new nsThreadPool();
+
+  for (int i = 0; i < 3; ++i) {
+    nsCOMPtr<nsIRunnable> task = new TestTask(i, count);
+    EXPECT_TRUE(task);
+
+    pool->Dispatch(task, NS_DISPATCH_NORMAL);
+  }
+
+  pool->Dispatch(
+      NS_NewRunnableFunction(
+          "sleep-for-400-ms",
+          [&count]() {
+            printf("### running from thread that sleeps for 400ms: %p\n",
+                   (void*)PR_GetCurrentThread());
+            PR_Sleep(PR_MillisecondsToInterval(400));
+            ++count;
+            printf("### thread awoke from long sleep: %p\n",
+                   (void*)PR_GetCurrentThread());
+          }),
+      NS_DISPATCH_NORMAL);
+
+  // Wait for a max of 350 ms. The thread should still be sleeping, and will
+  // be leaked.
+  pool->ShutdownWithTimeout(350);
+  // We can't be exact here; the thread we're running on might have gotten
+  // suspended and the sleeping thread, above, might have finished.
+  EXPECT_GE(count, 3);
+
+  // Sleep for a bit, and wait for the last thread to finish up.
+  PR_Sleep(PR_MillisecondsToInterval(200));
+
+  // Process events so the shutdown ack is received
+  NS_ProcessPendingEvents(NS_GetCurrentThread());
+
+  EXPECT_EQ(count, 4);
+}