/home/aconway/svn/qpid/cpp/src/qpid/sys/Condition.h

00001 #ifndef _sys_Condition_h
00002 #define _sys_Condition_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 "Mutex.h"
00028 #include "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 Condition
00041 {
00042   public:
00043     inline Condition();
00044     inline ~Condition();
00045     inline void wait(Mutex&);
00046     inline bool wait(Mutex&, 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 Condition::Condition() {
00063     CHECK_APR_SUCCESS(apr_thread_cond_create(&condition, APRPool::get()));
00064 }
00065 
00066 Condition::~Condition() {
00067     CHECK_APR_SUCCESS(apr_thread_cond_destroy(condition));
00068 }
00069 
00070 void Condition::wait(Mutex& mutex) {
00071     CHECK_APR_SUCCESS(apr_thread_cond_wait(condition, mutex.mutex));
00072 }
00073 
00074 bool Condition::wait(Mutex& mutex, const Time& absoluteTime){
00075     // APR uses microseconds.
00076     apr_status_t status =
00077         apr_thread_cond_timedwait(
00078             condition, mutex.mutex, absoluteTime/TIME_USEC);
00079     if(status != APR_TIMEUP) CHECK_APR_SUCCESS(status);
00080     return status == 0;
00081 }
00082 
00083 void Condition::notify(){
00084     CHECK_APR_SUCCESS(apr_thread_cond_signal(condition));
00085 }
00086 
00087 void Condition::notifyAll(){
00088     CHECK_APR_SUCCESS(apr_thread_cond_broadcast(condition));
00089 }
00090 
00091 #else
00092 // POSIX ================================================================
00093 
00094 Condition::Condition() {
00095     QPID_POSIX_THROW_IF(pthread_cond_init(&condition, 0));
00096 }
00097 
00098 Condition::~Condition() {
00099     QPID_POSIX_THROW_IF(pthread_cond_destroy(&condition));
00100 }
00101 
00102 void Condition::wait(Mutex& mutex) {
00103     QPID_POSIX_THROW_IF(pthread_cond_wait(&condition, &mutex.mutex));
00104 }
00105 
00106 bool Condition::wait(Mutex& mutex, const Time& absoluteTime){
00107     struct timespec ts;
00108     toTimespec(ts, absoluteTime);
00109     int status = pthread_cond_timedwait(&condition, &mutex.mutex, &ts);
00110     if (status != 0) {
00111         if (status == ETIMEDOUT) return false;
00112         throw QPID_POSIX_ERROR(status);
00113     }
00114     return true;
00115 }
00116 
00117 void Condition::notify(){
00118     QPID_POSIX_THROW_IF(pthread_cond_signal(&condition));
00119 }
00120 
00121 void Condition::notifyAll(){
00122     QPID_POSIX_THROW_IF(pthread_cond_broadcast(&condition));
00123 }
00124 #endif  /*USE_APR*/
00125 
00126 
00127 }}
00128 #endif  

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