1 files changed, 124 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestThreadPool.cpp b/xpcom/tests/gtest/TestThreadPool.cpp
new file mode 100644
index 000000000..56abf7608
--- /dev/null
+++ b/xpcom/tests/gtest/TestThreadPool.cpp
@@ -0,0 +1,124 @@
+/* -*- 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 "nsIThreadPool.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 Task final : public nsIRunnable
+{
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  explicit Task(int i) : mIndex(i) {}
+
+  NS_IMETHOD Run() override
+  {
+    printf("###(%d) running from thread: %p\n", mIndex, (void *) PR_GetCurrentThread());
+    int r = (int) ((float) rand() * 200 / RAND_MAX);
+    PR_Sleep(PR_MillisecondsToInterval(r));
+    printf("###(%d) exiting from thread: %p\n", mIndex, (void *) PR_GetCurrentThread());
+    ++sCount;
+    return NS_OK;
+  }
+
+  static mozilla::Atomic<int> sCount;
+
+private:
+  ~Task() {}
+
+  int mIndex;
+};
+NS_IMPL_ISUPPORTS(Task, nsIRunnable)
+
+mozilla::Atomic<int> Task::sCount;
+
+TEST(ThreadPool, Main)
+{
+  nsCOMPtr<nsIThreadPool> pool = do_CreateInstance(NS_THREADPOOL_CONTRACTID);
+  EXPECT_TRUE(pool);
+
+  for (int i = 0; i < 100; ++i) {
+    nsCOMPtr<nsIRunnable> task = new Task(i);
+    EXPECT_TRUE(task);
+
+    pool->Dispatch(task, NS_DISPATCH_NORMAL);
+  }
+
+  pool->Shutdown();
+  EXPECT_EQ(Task::sCount, 100);
+}
+
+TEST(ThreadPool, Parallelism)
+{
+  nsCOMPtr<nsIThreadPool> pool = do_CreateInstance(NS_THREADPOOL_CONTRACTID);
+  EXPECT_TRUE(pool);
+
+  // Dispatch and sleep to ensure we have an idle thread
+  nsCOMPtr<nsIRunnable> r0 = new Runnable();
+  pool->Dispatch(r0, NS_DISPATCH_SYNC);
+  PR_Sleep(PR_SecondsToInterval(2));
+
+  class Runnable1 : public Runnable {
+  public:
+    Runnable1(Monitor& aMonitor, bool& aDone)
+      : 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(PR_SecondsToInterval(300));
+      }
+      EXPECT_TRUE(mDone);
+      return NS_OK;
+    }
+  private:
+    Monitor& mMonitor;
+    bool& mDone;
+  };
+
+  class Runnable2 : public Runnable {
+  public:
+    Runnable2(Monitor& aMonitor, bool& aDone)
+      : 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("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();
+}