/opt/workspace/qpid/tags/M2/Final/cpp/lib/common/sys/Monitor.h

00001 #ifndef _sys_Monitor_h
00002 #define _sys_Monitor_h
00003 
00004 /*
00005  *
00006  * Licensed to the Apache Software Foundation (ASF) under one
00007  * or more contributor license agreements.  See the NOTICE file
00008  * distributed with this work for additional information
00009  * regarding copyright ownership.  The ASF licenses this file
00010  * to you under the Apache License, Version 2.0 (the
00011  * "License"); you may not use this file except in compliance
00012  * with the License.  You may obtain a copy of the License at
00013  * 
00014  *   http://www.apache.org/licenses/LICENSE-2.0
00015  * 
00016  * Unless required by applicable law or agreed to in writing,
00017  * software distributed under the License is distributed on an
00018  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
00019  * KIND, either express or implied.  See the License for the
00020  * specific language governing permissions and limitations
00021  * under the License.
00022  *
00023  */
00024 
00025 #include <sys/errno.h>
00026 #include <boost/noncopyable.hpp>
00027 #include <sys/Mutex.h>
00028 #include <sys/Time.h>
00029 
00030 #ifdef USE_APR
00031 #  include <apr_thread_cond.h>
00032 #endif
00033 
00034 namespace qpid {
00035 namespace sys {
00036 
00040 class Monitor : public Mutex
00041 {
00042   public:
00043     inline Monitor();
00044     inline ~Monitor();
00045     inline void wait();
00046     inline bool wait(const Time& absoluteTime);
00047     inline void notify();
00048     inline void notifyAll();
00049 
00050   private:
00051 #ifdef USE_APR
00052     apr_thread_cond_t* condition;
00053 #else
00054     pthread_cond_t condition;
00055 #endif
00056 };
00057 
00058 
00059 // APR ================================================================
00060 #ifdef USE_APR
00061 
00062 Monitor::Monitor() {
00063     apr_pool_t* pool = APRPool::get();
00064     CHECK_APR_SUCCESS(apr_thread_cond_create(&condition, pool));
00065     APRPool::free(pool);
00066 }
00067 
00068 Monitor::~Monitor() {
00069     CHECK_APR_SUCCESS(apr_thread_cond_destroy(condition));
00070 }
00071 
00072 void Monitor::wait() {
00073     CHECK_APR_SUCCESS(apr_thread_cond_wait(condition, mutex));
00074 }
00075 
00076 bool Monitor::wait(const Time& absoluteTime){
00077     // APR uses microseconds.
00078     apr_status_t status =
00079         apr_thread_cond_timedwait(condition, mutex, absoluteTime/TIME_USEC);
00080     if(status != APR_TIMEUP) CHECK_APR_SUCCESS(status);
00081     return status == 0;
00082 }
00083 
00084 void Monitor::notify(){
00085     CHECK_APR_SUCCESS(apr_thread_cond_signal(condition));
00086 }
00087 
00088 void Monitor::notifyAll(){
00089     CHECK_APR_SUCCESS(apr_thread_cond_broadcast(condition));
00090 }
00091 
00092 #else
00093 // POSIX ================================================================
00094 
00095 Monitor::Monitor() {
00096     QPID_POSIX_THROW_IF(pthread_cond_init(&condition, 0));
00097 }
00098 
00099 Monitor::~Monitor() {
00100     QPID_POSIX_THROW_IF(pthread_cond_destroy(&condition));
00101 }
00102 
00103 void Monitor::wait() {
00104     QPID_POSIX_THROW_IF(pthread_cond_wait(&condition, &mutex));
00105 }
00106 
00107 bool Monitor::wait(const Time& absoluteTime){
00108     struct timespec ts;
00109     toTimespec(ts, absoluteTime);
00110     int status = pthread_cond_timedwait(&condition, &mutex, &ts);
00111     if (status != 0) {
00112         if (status == ETIMEDOUT) return false;
00113         throw QPID_POSIX_ERROR(status);
00114     }
00115     return true;
00116 }
00117 
00118 void Monitor::notify(){
00119     QPID_POSIX_THROW_IF(pthread_cond_signal(&condition));
00120 }
00121 
00122 void Monitor::notifyAll(){
00123     QPID_POSIX_THROW_IF(pthread_cond_broadcast(&condition));
00124 }
00125 #endif  /*USE_APR*/
00126 
00127 
00128 }}
00129 #endif  

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