Semaphore.hpp
Go to the documentation of this file.00001 /*************************************************************************** 00002 tag: Peter Soetens Tue Apr 5 16:53:24 CEST 2005 Semaphore.hpp 00003 00004 Semaphore.hpp - description 00005 ------------------- 00006 begin : Tue April 05 2005 00007 copyright : (C) 2005 Peter Soetens 00008 email : peter.soetens@mech.kuleuven.ac.be 00009 00010 *************************************************************************** 00011 * This library is free software; you can redistribute it and/or * 00012 * modify it under the terms of the GNU General Public * 00013 * License as published by the Free Software Foundation; * 00014 * version 2 of the License. * 00015 * * 00016 * As a special exception, you may use this file as part of a free * 00017 * software library without restriction. Specifically, if other files * 00018 * instantiate templates or use macros or inline functions from this * 00019 * file, or you compile this file and link it with other files to * 00020 * produce an executable, this file does not by itself cause the * 00021 * resulting executable to be covered by the GNU General Public * 00022 * License. This exception does not however invalidate any other * 00023 * reasons why the executable file might be covered by the GNU General * 00024 * Public License. * 00025 * * 00026 * This library is distributed in the hope that it will be useful, * 00027 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00028 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * 00029 * Lesser General Public License for more details. * 00030 * * 00031 * You should have received a copy of the GNU General Public * 00032 * License along with this library; if not, write to the Free Software * 00033 * Foundation, Inc., 59 Temple Place, * 00034 * Suite 330, Boston, MA 02111-1307 USA * 00035 * * 00036 ***************************************************************************/ 00037 00038 00039 00040 00041 #ifndef RTT_OS_SEMAPHORE_HPP 00042 #define RTT_OS_SEMAPHORE_HPP 00043 00044 #include "fosi.h" 00045 #include "../rtt-config.h" 00046 #include "../Time.hpp" 00047 00048 namespace RTT 00049 { namespace os { 00061 class RTT_API Semaphore 00062 { 00063 private: 00064 rt_sem_t sem; 00065 public: 00070 Semaphore(int count) 00071 { 00072 rtos_sem_init( &sem, count ); 00073 } 00074 00078 ~Semaphore() 00079 { 00080 rtos_sem_destroy( &sem ); 00081 } 00082 00087 void wait() 00088 { 00089 rtos_sem_wait( &sem ); 00090 } 00091 00096 void signal() 00097 { 00098 rtos_sem_signal( &sem ); 00099 } 00100 00106 bool trywait() 00107 { 00108 if ( rtos_sem_trywait( &sem ) == 0 ) 00109 return true; 00110 return false; 00111 } 00112 00120 bool waitUntil( Seconds abs_time ) 00121 { 00122 if (rtos_sem_wait_until( &sem, Seconds_to_nsecs(abs_time) ) == 0 ) 00123 return true; 00124 return false; 00125 } 00126 00134 bool waitUntil( nsecs abs_time ) 00135 { 00136 if (rtos_sem_wait_until( &sem, abs_time ) == 0 ) 00137 return true; 00138 return false; 00139 } 00140 00144 #ifndef OROPKG_OS_MACOSX 00145 int value() 00146 { 00147 return rtos_sem_value( &sem ); 00148 } 00149 #endif 00150 }; 00151 }} 00152 00153 #endif