summaryrefslogtreecommitdiff
path: root/src/i_main.c
blob: a0b0bfd586652d5c1dcbcaefa0d30cae825ea27b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
//	Main program, simply calls D_DoomMain high level loop.
//
//-----------------------------------------------------------------------------

#include "config.h"

#include "SDL.h"

#include <signal.h>

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

#ifdef HAVE_SCHED_SETAFFINITY
#include <unistd.h>
#include <sched.h>
#endif

#include "doomtype.h"
#include "i_system.h"
#include "m_argv.h"

//
// D_DoomMain()
// Not a globally visible function, just included for source reference,
// calls all startup code, parses command line options.
//

void D_DoomMain (void);

#if defined(_WIN32)

typedef BOOL WINAPI (*SetAffinityFunc)(HANDLE hProcess, DWORD_PTR mask);

// This is a bit more complicated than it really needs to be.  We really
// just need to call the SetProcessAffinityMask function, but that
// function doesn't exist on systems before Windows 2000.  Instead,
// dynamically look up the function and call the pointer to it.  This
// way, the program will run on older versions of Windows (Win9x, etc.)

static void LockCPUAffinity(void)
{
    HMODULE kernel32_dll;
    SetAffinityFunc SetAffinity;

    // Find the kernel interface DLL.

    kernel32_dll = LoadLibrary("kernel32.dll");

    if (kernel32_dll == NULL)
    {
        // This should never happen...

        fprintf(stderr, "Failed to load kernel32.dll\n");
        return;
    }
    // Find the SetProcessAffinityMask function.

    SetAffinity = GetProcAddress(kernel32_dll, "SetProcessAffinityMask");

    // If the function was not found, we are on an old (Win9x) system
    // that doesn't have this function.  That's no problem, because
    // those systems don't support SMP anyway.

    if (SetAffinity != NULL)
    {
        if (!SetAffinity(GetCurrentProcess(), 1))
        {
            fprintf(stderr, "Failed to set process affinity (%d)\n",
                            (int) GetLastError());
        }
    }
}

#elif defined(HAVE_SCHED_SETAFFINITY)

// Unix (Linux) version:

static void LockCPUAffinity(void)
{
    cpu_set_t set;

    CPU_ZERO(&set);
    CPU_SET(0, &set);

    sched_setaffinity(getpid(), sizeof(set), &set);
}

#else

#warning No known way to set processor affinity on this platform.
#warning You may experience crashes due to SDL_mixer.

static void LockCPUAffinity(void)
{
    fprintf(stderr, 
    "WARNING: No known way to set processor affinity on this platform.\n"
    "         You may experience crashes due to SDL_mixer.\n");
}

#endif

int main(int argc, char **argv)
{
    // save arguments

    myargc = argc;
    myargv = argv;

    // Only schedule on a single core, if we have multiple
    // cores.  This is to work around a bug in SDL_mixer.

    LockCPUAffinity();

    // start doom

    D_DoomMain ();

    return 0;
}