libs/pbd/semutils.cc

   1 /*
   2     Copyright (C) 2010 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 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 General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #include "pbd/semutils.h"
  20 #include "pbd/failed_constructor.h"
  21
  22 using namespace PBD;
  23
  24 ProcessSemaphore::ProcessSemaphore (const char* name, int val)
  25 {
  26 #ifdef __APPLE__
  27         if ((_sem = sem_open (name, O_CREAT, 0600, val)) == (sem_t*) SEM_FAILED) {
  28                 throw failed_constructor ();
  29         }
  30
  31         /* this semaphore does not exist for IPC */
  32
  33         if (sem_unlink (name)) {
  34                 throw failed_constructor ();
  35         }
  36
  37 #else
  38         if (sem_init (&_sem, 0, val)) {
  39                 throw failed_constructor ();
  40         }
  41 #endif
  42 }
  43
  44 ProcessSemaphore::~ProcessSemaphore ()
  45 {
  46 #ifdef __APPLE__
  47         sem_close (ptr_to_sem());
  48 #endif
  49 }