windows/JackMMCSS.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
  21
  22 #ifndef __JackMMCSS__
  23 #define __JackMMCSS__
  24
  25 #include "JackSystemDeps.h"
  26 #include "JackCompilerDeps.h"
  27 #include <windows.h>
  28 #include <map>
  29
  30 namespace Jack
  31 {
  32
  33 typedef enum _AVRT_PRIORITY {
  34   AVRT_PRIORITY_LOW = -1,
  35   AVRT_PRIORITY_NORMAL,         /* 0 */
  36   AVRT_PRIORITY_HIGH,           /* 1 */
  37   AVRT_PRIORITY_CRITICAL        /* 2 */
  38 } AVRT_PRIORITY, *PAVRT_PRIORITY;
  39
  40 #define BASE_REALTIME_PRIORITY 90
  41
  42 typedef HANDLE (WINAPI *avSetMmThreadCharacteristics)(LPCTSTR, LPDWORD);
  43 typedef BOOL (WINAPI *avRevertMmThreadCharacteristics)(HANDLE);
  44 typedef BOOL (WINAPI *avSetMmThreadPriority)(HANDLE, AVRT_PRIORITY);
  45
  46 /*!
  47 \brief MMCSS services.
  48 */
  49
  50 class SERVER_EXPORT JackMMCSS
  51 {
  52
  53     private:
  54
  55         static JACK_HANDLE fAvrtDll;
  56         static avSetMmThreadCharacteristics ffMMCSSFun1;
  57         static avSetMmThreadPriority ffMMCSSFun2;
  58         static avRevertMmThreadCharacteristics ffMMCSSFun3;
  59         static std::map<jack_native_thread_t, HANDLE> fHandleTable;
  60
  61     public:
  62
  63         JackMMCSS();
  64         ~JackMMCSS();
  65
  66         static int MMCSSAcquireRealTime(jack_native_thread_t thread, int priority);
  67         static int MMCSSDropRealTime(jack_native_thread_t thread);
  68
  69 };
  70
  71 } // end of namespace
  72
  73 #endif
  74