Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/scheduler_based_abstract_lock.h
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00001 /*
00002  * Copyright 2011 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_SCHEDULER_BASED_ABSTRACT_LOCK_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_SCHEDULER_BASED_ABSTRACT_LOCK_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/named_lock_manager.h"
00024 
00025 namespace net_instaweb {
00026 
00027 class Function;
00028 class Scheduler;
00029 
00036 class SchedulerBasedAbstractLock : public NamedLock {
00037  public:
00038   virtual ~SchedulerBasedAbstractLock();
00039   virtual bool LockTimedWait(int64 wait_ms);
00040   virtual void LockTimedWait(int64 wait_ms, Function* callback);
00041 
00042   virtual bool LockTimedWaitStealOld(int64 wait_ms, int64 steal_ms);
00043   virtual void LockTimedWaitStealOld(
00044       int64 wait_ms, int64 steal_ms, Function* callback);
00045 
00046  protected:
00047   virtual Scheduler* scheduler() const = 0;
00048 
00049  private:
00050   typedef bool (SchedulerBasedAbstractLock::*TryLockMethod)(int64 steal_ms);
00051   bool TryLockIgnoreSteal(int64 steal_ignored);
00052   bool BusySpin(TryLockMethod try_lock, int64 steal_ms);
00053   void PollAndCallback(TryLockMethod try_lock, int64 steal_ms,
00054                        int64 wait_ms, Function* callback);
00055 };
00056 
00057 }  
00058 
00059 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_SCHEDULER_BASED_ABSTRACT_LOCK_H_
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