content/common/gpu/sync_point_manager.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/common/gpu/sync_point_manager.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace content {
  10
  11 SyncPointManager::SyncPointManager()
  12     : next_sync_point_(1) {
  13 }
  14
  15 SyncPointManager::~SyncPointManager() {
  16 }
  17
  18 uint32 SyncPointManager::GenerateSyncPoint() {
  19   base::AutoLock lock(lock_);
  20   uint32 sync_point = next_sync_point_++;
  21
  22   // Note: wrapping would take days for a buggy/compromized renderer that would
  23   // insert sync points in a loop, but if that were to happen, better explicitly
  24   // crash the GPU process than risk worse.
  25   // For normal operation (at most a few per frame), it would take ~a year to
  26   // wrap.
  27   CHECK(sync_point_map_.find(sync_point) == sync_point_map_.end());
  28   sync_point_map_.insert(std::make_pair(sync_point, ClosureList()));
  29   return sync_point;
  30 }
  31
  32 void SyncPointManager::RetireSyncPoint(uint32 sync_point) {
  33   DCHECK(thread_checker_.CalledOnValidThread());
  34   ClosureList list;
  35   {
  36     base::AutoLock lock(lock_);
  37     SyncPointMap::iterator it = sync_point_map_.find(sync_point);
  38     DCHECK(it != sync_point_map_.end());
  39     list.swap(it->second);
  40     sync_point_map_.erase(it);
  41   }
  42   for (ClosureList::iterator i = list.begin(); i != list.end(); ++i)
  43     i->Run();
  44 }
  45
  46 void SyncPointManager::AddSyncPointCallback(uint32 sync_point,
  47                                             const base::Closure& callback) {
  48   DCHECK(thread_checker_.CalledOnValidThread());
  49   {
  50     base::AutoLock lock(lock_);
  51     SyncPointMap::iterator it = sync_point_map_.find(sync_point);
  52     if (it != sync_point_map_.end()) {
  53       it->second.push_back(callback);
  54       return;
  55     }
  56   }
  57   callback.Run();
  58 }
  59
  60 }  // namespace content