/usr/share/cruisecontrol-bin-2.6.1/projects/qpid-trunk/cpp/src/qpid/sys/Waitable.h

00001 #ifndef QPID_SYS_WAITABLE_H
00002 #define QPID_SYS_WAITABLE_H
00003 
00004 /*
00005  * Licensed to the Apache Software Foundation (ASF) under one
00006  * or more contributor license agreements.  See the NOTICE file
00007  * distributed with this work for additional information
00008  * regarding copyright ownership.  The ASF licenses this file
00009  * to you under the Apache License, Version 2.0 (the
00010  * "License"); you may not use this file except in compliance
00011  * with the License.  You may obtain a copy of the License at
00012  *
00013  *   http://www.apache.org/licenses/LICENSE-2.0
00014  *
00015  * Unless required by applicable law or agreed to in writing,
00016  * software distributed under the License is distributed on an
00017  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
00018  * KIND, either express or implied.  See the License for the
00019  * specific language governing permissions and limitations
00020  * under the License.
00021  *
00022  */
00023 
00024 #include "Monitor.h"
00025 
00026 #include <assert.h>
00027 
00028 namespace qpid {
00029 namespace sys {
00030 
00036 class Waitable : public Monitor {
00037   public:
00038     Waitable() : waiters(0) {}
00039 
00043     struct ScopedWait {
00044         Waitable& w;
00045         ScopedWait(Waitable& w_) : w(w_) { ++w.waiters; }
00046         ~ScopedWait() { if (--w.waiters==0) w.notifyAll(); }
00047     };
00048 
00052     void waitWaiters() {
00053         while (waiters != 0) 
00054             wait();
00055     }
00056 
00060     size_t hasWaiters() { return waiters; }
00061     
00062   private:
00063   friend struct ScopedWait;
00064     size_t waiters;
00065 };
00066 
00067 }} // namespace qpid::sys
00068 
00069 
00070 
00071 #endif  

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