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C_Semaphore.hpp

00001 /*
00002  *  This program is free software; you can redistribute it and/or modify
00003  *  it under the terms of the GNU General Public License as published by
00004  *  the Free Software Foundation; either version 2 of the License, or
00005  *  (at your option) any later version.
00006  *
00007  *  This program is distributed in the hope that it will be useful,
00008  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00009  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00010  *  GNU General Public License for more details.
00011  *
00012  *  You should have received a copy of the GNU General Public License
00013  *  along with this program; if not, write to the Free Software
00014  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00015  *
00016  * (c)Copyright 2006 Hewlett-Packard Development Company, LP.
00017  *
00018  */
00019 
00020 // C_Semaphore class definition
00021 
00022 #ifndef _C_SEMAPHORE
00023 #define _C_SEMAPHORE
00024 
00025 #define T_CounterValue     int
00026 #define COUNTER_INIT_VALUE 1
00027 #define COUNTER_COMP_VALUE 0
00028 
00029 class C_Semaphore {
00030 
00031  public:
00032   T_CounterValue P(); // P: blocks while <=0 (signaled) and then -- 
00033   T_CounterValue V(); // V: ++ and signal the change
00034   C_Semaphore() ;
00035   ~C_Semaphore() ;
00036 
00037  protected:
00038   void init();        // internal init of the semaphore => system calls
00039   void destroy();     // internal destroy of the semaphore => system calls
00040   void *m_impl;       // semaphore data structure
00041 
00042 } ;
00043 
00044 #endif // _C_SEMAPHORE

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