xpcom/threads/ThreadDelay.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "ThreadDelay.h"
   8 #include "mozilla/Assertions.h"
   9 #include "mozilla/ChaosMode.h"
  10
  11 #if defined(XP_WIN)
  12 #  include <windows.h>
  13 #else
  14 #  include <unistd.h>
  15 #endif
  16
  17 namespace mozilla {
  18
  19 void DelayForChaosMode(ChaosFeature aFeature,
  20                        const uint32_t aMicrosecondLimit) {
  21   if (!ChaosMode::isActive(aFeature)) {
  22     return;
  23   }
  24
  25   MOZ_ASSERT(aMicrosecondLimit <= 1000);
  26 #if defined(XP_WIN)
  27   // Windows doesn't support sleeping at less than millisecond resolution.
  28   // We could spin here, or we could just sleep for one millisecond.
  29   // Sleeping for a full millisecond causes heavy delays, so we don't do
  30   // anything here for now until we have found a good way to sleep more
  31   // precisely here.
  32 #else
  33   const uint32_t duration = ChaosMode::randomUint32LessThan(aMicrosecondLimit);
  34   ::usleep(duration);
  35 #endif
  36 }
  37
  38 }  // namespace mozilla