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 <signal.h>
  33
  34 #ifdef _WIN32
  35 #define WIN32_LEAN_AND_MEAN
  36 #include <windows.h>
  37 #endif
  38
  39 #ifdef HAVE_SCHED_SETAFFINITY
  40 #include <unistd.h>
  41 #include <sched.h>
  42 #endif
  43
  44 #include "doomdef.h"
  45 #include "i_system.h"
  46 #include "m_argv.h"
  47 #include "d_main.h"
  48
  49 #if defined(_WIN32)
  50
  51 typedef BOOL WINAPI (*SetAffinityFunc)(HANDLE hProcess, DWORD_PTR mask);
  52
  53 // This is a bit more complicated than it really needs to be.  We really
  54 // just need to call the SetProcessAffinityMask function, but that
  55 // function doesn't exist on systems before Windows 2000.  Instead,
  56 // dynamically look up the function and call the pointer to it.  This
  57 // way, the program will run on older versions of Windows (Win9x, etc.)
  58
  59 static void LockCPUAffinity(void)
  60 {
  61     HMODULE kernel32_dll;
  62     SetAffinityFunc SetAffinity;
  63
  64     // Find the kernel interface DLL.
  65
  66     kernel32_dll = LoadLibrary("kernel32.dll");
  67
  68     if (kernel32_dll == NULL)
  69     {
  70         // This should never happen...
  71
  72         fprintf(stderr, "Failed to load kernel32.dll\n");
  73         return;
  74     }
  75
  76     // Find the SetProcessAffinityMask function.
  77
  78     SetAffinity = GetProcAddress(kernel32_dll, "SetProcessAffinityMask");
  79
  80     // If the function was not found, we are on an old (Win9x) system
  81     // that doesn't have this function.  That's no problem, because
  82     // those systems don't support SMP anyway.
  83
  84     if (SetAffinity != NULL)
  85     {
  86         if (!SetAffinity(GetCurrentProcess(), 1))
  87         {
  88             fprintf(stderr, "Failed to set process affinity (%d)\n",
  89                             (int) GetLastError());
  90         }
  91     }
  92 }
  93
  94 #elif defined(HAVE_SCHED_SETAFFINITY)
  95
  96 // Unix (Linux) version:
  97
  98 static void LockCPUAffinity(void)
  99 {
 100     cpu_set_t set;
 101
 102     CPU_ZERO(&set);
 103     CPU_SET(0, &set);
 104
 105     sched_setaffinity(getpid(), sizeof(set), &set);
 106 }
 107
 108 #else
 109
 110 #warning No known way to set processor affinity on this platform.
 111 #warning You may experience crashes due to SDL_mixer.
 112
 113 static void LockCPUAffinity(void)
 114 {
 115     fprintf(stderr,
 116     "WARNING: No known way to set processor affinity on this platform.\n"
 117     "         You may experience crashes due to SDL_mixer.\n");
 118 }
 119
 120 #endif
 121
 122 int main(int argc, char **argv)
 123 {
 124     // save arguments
 125
 126     myargc = argc;
 127     myargv = argv;
 128
 129     // Only schedule on a single core, if we have multiple
 130     // cores.  This is to work around a bug in SDL_mixer.
 131
 132     LockCPUAffinity();
 133
 134     // start doom
 135
 136     D_DoomMain ();
 137
 138     return 0;
 139 }
 140