src/i_main.c

   1 // Emacs style mode select   -*- C++ -*-
   2 //-----------------------------------------------------------------------------
   3 //
   4 // Copyright(C) 1993-1996 Id Software, Inc.
   5 // Copyright(C) 2005 Simon Howard
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License
   9 // as published by the Free Software Foundation; either version 2
  10 // of the License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20 // 02111-1307, USA.
  21 //
  22 // DESCRIPTION:
  23 //      Main program, simply calls D_DoomMain high level loop.
  24 //
  25 //-----------------------------------------------------------------------------
  26
  27
  28 #include "config.h"
  29
  30 #include "SDL.h"
  31
  32 #include "doomdef.h"
  33 #include "i_system.h"
  34 #include "m_argv.h"
  35 #include "d_main.h"
  36
  37 #if defined(_WIN32_WCE)
  38
  39 // Windows CE?  I doubt it even supports SMP..
  40
  41 static void LockCPUAffinity(void)
  42 {
  43 }
  44
  45 #elif defined(_WIN32)
  46
  47 #define WIN32_LEAN_AND_MEAN
  48 #include <windows.h>
  49
  50 typedef BOOL WINAPI (*SetAffinityFunc)(HANDLE hProcess, DWORD_PTR mask);
  51
  52 // This is a bit more complicated than it really needs to be.  We really
  53 // just need to call the SetProcessAffinityMask function, but that
  54 // function doesn't exist on systems before Windows 2000.  Instead,
  55 // dynamically look up the function and call the pointer to it.  This
  56 // way, the program will run on older versions of Windows (Win9x, etc.)
  57
  58 static void LockCPUAffinity(void)
  59 {
  60     HMODULE kernel32_dll;
  61     SetAffinityFunc SetAffinity;
  62
  63     // Find the kernel interface DLL.
  64
  65     kernel32_dll = LoadLibrary("kernel32.dll");
  66
  67     if (kernel32_dll == NULL)
  68     {
  69         // This should never happen...
  70
  71         fprintf(stderr, "Failed to load kernel32.dll\n");
  72         return;
  73     }
  74
  75     // Find the SetProcessAffinityMask function.
  76
  77     SetAffinity = GetProcAddress(kernel32_dll, "SetProcessAffinityMask");
  78
  79     // If the function was not found, we are on an old (Win9x) system
  80     // that doesn't have this function.  That's no problem, because
  81     // those systems don't support SMP anyway.
  82
  83     if (SetAffinity != NULL)
  84     {
  85         if (!SetAffinity(GetCurrentProcess(), 1))
  86         {
  87             fprintf(stderr, "Failed to set process affinity (%d)\n",
  88                             (int) GetLastError());
  89         }
  90     }
  91 }
  92
  93 #elif defined(HAVE_SCHED_SETAFFINITY)
  94
  95 #include <unistd.h>
  96 #include <sched.h>
  97
  98 // Unix (Linux) version:
  99
 100 static void LockCPUAffinity(void)
 101 {
 102 #ifdef CPU_SET
 103     cpu_set_t set;
 104
 105     CPU_ZERO(&set);
 106     CPU_SET(0, &set);
 107
 108     sched_setaffinity(getpid(), sizeof(set), &set);
 109 #else
 110     unsigned long mask = 1;
 111     sched_setaffinity(getpid(), sizeof(mask), &mask);
 112 #endif
 113 }
 114
 115 #else
 116
 117 #warning No known way to set processor affinity on this platform.
 118 #warning You may experience crashes due to SDL_mixer.
 119
 120 static void LockCPUAffinity(void)
 121 {
 122     fprintf(stderr,
 123     "WARNING: No known way to set processor affinity on this platform.\n"
 124     "         You may experience crashes due to SDL_mixer.\n");
 125 }
 126
 127 #endif
 128
 129 int main(int argc, char **argv)
 130 {
 131     // save arguments
 132
 133     myargc = argc;
 134     myargv = argv;
 135
 136     // Only schedule on a single core, if we have multiple
 137     // cores.  This is to work around a bug in SDL_mixer.
 138
 139     LockCPUAffinity();
 140
 141     // start doom
 142
 143     D_DoomMain ();
 144
 145     return 0;
 146 }
 147