windows/JackWinSemaphore.cpp

   1 /*
   2 Copyright (C) 2004-2005 Grame
   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
  20 #include "JackWinSemaphore.h"
  21 #include "JackConstants.h"
  22 #include "JackTools.h"
  23 #include "JackError.h"
  24 #include <stdio.h>
  25
  26 namespace Jack
  27 {
  28
  29 void JackWinSemaphore::BuildName(const char* client_name, const char* server_name, char* res)
  30 {
  31     char ext_client_name[JACK_CLIENT_NAME_SIZE + 1];
  32     JackTools::RewriteName(client_name, ext_client_name);
  33     sprintf(res, "jack_pipe.%s_%s", server_name, ext_client_name);
  34 }
  35
  36 bool JackWinSemaphore::Signal()
  37 {
  38     BOOL res;
  39     assert(fSemaphore);
  40
  41     if (fFlush)
  42         return true;
  43
  44     if (!(res = ReleaseSemaphore(fSemaphore, 1, NULL))) {
  45         jack_error("JackWinSemaphore::Signal name = %s err = %ld", fName, GetLastError());
  46     }
  47
  48     return res;
  49 }
  50
  51 bool JackWinSemaphore::SignalAll()
  52 {
  53     BOOL res;
  54     assert(fSemaphore);
  55
  56     if (fFlush)
  57         return true;
  58
  59     if (!(res = ReleaseSemaphore(fSemaphore, 1, NULL))) {
  60         jack_error("JackWinSemaphore::SignalAll name = %s err = %ld", fName, GetLastError());
  61     }
  62
  63     return res;
  64 }
  65
  66 bool JackWinSemaphore::Wait()
  67 {
  68     DWORD res;
  69
  70     if ((res = WaitForSingleObject(fSemaphore, INFINITE)) == WAIT_TIMEOUT) {
  71         jack_error("JackWinSemaphore::TimedWait name = %s time_out", fName);
  72     }
  73
  74     return (res == WAIT_OBJECT_0);
  75 }
  76
  77 bool JackWinSemaphore::TimedWait(long usec)
  78 {
  79     DWORD res;
  80
  81     if ((res = WaitForSingleObject(fSemaphore, usec / 1000)) == WAIT_TIMEOUT) {
  82         jack_error("JackWinSemaphore::TimedWait name = %s time_out", fName);
  83     }
  84
  85     return (res == WAIT_OBJECT_0);
  86 }
  87
  88 // Client side : get the published semaphore from server
  89 bool JackWinSemaphore::ConnectInput(const char* name, const char* server_name)
  90 {
  91     BuildName(name, server_name, fName);
  92     jack_log("JackWinSemaphore::Connect %s", fName);
  93
  94     // Temporary...
  95     if (fSemaphore) {
  96         jack_log("Already connected name = %s", name);
  97         return true;
  98     }
  99
 100     if ((fSemaphore = OpenSemaphore(SEMAPHORE_ALL_ACCESS , FALSE, fName)) == NULL) {
 101         jack_error("Connect: can't check in named event name = %s err = %ld", fName, GetLastError());
 102         return false;
 103     } else {
 104         return true;
 105     }
 106 }
 107
 108 bool JackWinSemaphore::Connect(const char* name, const char* server_name)
 109 {
 110     return ConnectInput(name, server_name);
 111 }
 112
 113 bool JackWinSemaphore::ConnectOutput(const char* name, const char* server_name)
 114 {
 115     return ConnectInput(name, server_name);
 116 }
 117
 118 bool JackWinSemaphore::Disconnect()
 119 {
 120     if (fSemaphore) {
 121         jack_log("JackWinSemaphore::Disconnect %s", fName);
 122         CloseHandle(fSemaphore);
 123         fSemaphore = NULL;
 124         return true;
 125     } else {
 126         return false;
 127     }
 128 }
 129
 130 bool JackWinSemaphore::Allocate(const char* name, const char* server_name, int value)
 131 {
 132     BuildName(name, server_name, fName);
 133     jack_log("JackWinSemaphore::Allocate name = %s val = %ld", fName, value);
 134
 135     if ((fSemaphore = CreateSemaphore(NULL, value, 32767, fName)) == NULL) {
 136         jack_error("Allocate: can't check in named semaphore name = %s err = %ld", fName, GetLastError());
 137         return false;
 138     } else if (GetLastError() == ERROR_ALREADY_EXISTS) {
 139         jack_error("Allocate: named semaphore already exist name = %s", fName);
 140         // Try to open it
 141         fSemaphore = OpenSemaphore(SEMAPHORE_ALL_ACCESS, FALSE, fName);
 142         return (fSemaphore != NULL);
 143     } else {
 144         return true;
 145     }
 146 }
 147
 148 void JackWinSemaphore::Destroy()
 149 {
 150     if (fSemaphore != NULL) {
 151         jack_log("JackWinSemaphore::Destroy %s", fName);
 152         CloseHandle(fSemaphore);
 153         fSemaphore = NULL;
 154     } else {
 155         jack_error("JackWinSemaphore::Destroy synchro == NULL");
 156     }
 157 }
 158
 159
 160 } // end of namespace
 161