posix/JackPosixSemaphore.h

   1 /*
   2 Copyright (C) 2004-2008 Grame
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU Lesser General Public License as published by
   6 the Free Software Foundation; either version 2.1 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU Lesser General Public License for more details.
  13
  14 You should have received a copy of the GNU Lesser General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 */
  19
  20 #ifndef __JackPosixSemaphore__
  21 #define __JackPosixSemaphore__
  22
  23 #include "JackSynchro.h"
  24 #include "JackCompilerDeps.h"
  25 #include <semaphore.h>
  26 #include <time.h>
  27 #include <assert.h>
  28
  29 namespace Jack
  30 {
  31
  32 /*!
  33 \brief Inter process synchronization using POSIX semaphore.
  34 */
  35
  36 class SERVER_EXPORT JackPosixSemaphore : public detail::JackSynchro
  37 {
  38
  39     private:
  40
  41         sem_t* fSemaphore;
  42         bool fPromiscuous;
  43 #ifdef __linux__
  44         int fPromiscuousGid;
  45 #endif
  46
  47     protected:
  48
  49         void BuildName(const char* name, const char* server_name, char* res, int size);
  50
  51     public:
  52
  53         JackPosixSemaphore();
  54
  55         bool Signal();
  56         bool SignalAll();
  57         bool Wait();
  58         bool TimedWait(long usec);
  59
  60         bool Allocate(const char* name, const char* server_name, int value);
  61         bool Connect(const char* name, const char* server_name);
  62         bool ConnectInput(const char* name, const char* server_name);
  63         bool ConnectOutput(const char* name, const char* server_name);
  64         bool Disconnect();
  65         void Destroy();
  66 };
  67
  68 } // end of namespace
  69
  70
  71 #endif
  72