sys_shared.c

   1 #ifdef WIN32
   2 # ifndef DONT_USE_SETDLLDIRECTORY
   3 #  define _WIN32_WINNT 0x0502
   4 # endif
   5 #endif
   6
   7 #include "quakedef.h"
   8 #include "taskqueue.h"
   9 #include "thread.h"
  10
  11 #define SUPPORTDLL
  12
  13 #ifdef WIN32
  14 # include <windows.h>
  15 # include <mmsystem.h> // timeGetTime
  16 # include <time.h> // localtime
  17 #ifdef _MSC_VER
  18 #pragma comment(lib, "winmm.lib")
  19 #endif
  20 #else
  21 # ifdef __FreeBSD__
  22 #  include <sys/sysctl.h>
  23 # endif
  24 # include <unistd.h>
  25 # include <fcntl.h>
  26 # include <sys/time.h>
  27 # include <time.h>
  28 # ifdef SUPPORTDLL
  29 #  include <dlfcn.h>
  30 # endif
  31 #endif
  32
  33 static char sys_timestring[128];
  34 char *Sys_TimeString(const char *timeformat)
  35 {
  36         time_t mytime = time(NULL);
  37 #if _MSC_VER >= 1400
  38         struct tm mytm;
  39         localtime_s(&mytm, &mytime);
  40         strftime(sys_timestring, sizeof(sys_timestring), timeformat, &mytm);
  41 #else
  42         strftime(sys_timestring, sizeof(sys_timestring), timeformat, localtime(&mytime));
  43 #endif
  44         return sys_timestring;
  45 }
  46
  47
  48 void Sys_Quit (int returnvalue)
  49 {
  50         // Unlock mutexes because the quit command may jump directly here, causing a deadlock
  51         if (cmd_client.text_mutex)
  52                 Cbuf_Unlock(&cmd_client);
  53         if (cmd_server.text_mutex)
  54                 Cbuf_Unlock(&cmd_server);
  55         SV_UnlockThreadMutex();
  56         TaskQueue_Frame(true);
  57
  58         if (COM_CheckParm("-profilegameonly"))
  59                 Sys_AllowProfiling(false);
  60         host.state = host_shutdown;
  61         Host_Shutdown();
  62         exit(returnvalue);
  63 }
  64
  65 #ifdef __cplusplus
  66 extern "C"
  67 #endif
  68 void Sys_AllowProfiling(qboolean enable)
  69 {
  70 #ifdef __ANDROID__
  71 #ifdef USE_PROFILER
  72         extern void monstartup(const char *libname);
  73         extern void moncleanup(void);
  74         if (enable)
  75                 monstartup("libmain.so");
  76         else
  77                 moncleanup();
  78 #endif
  79 #elif (defined(__linux__) && (defined(__GLIBC__) || defined(__GNU_LIBRARY__))) || defined(__FreeBSD__)
  80         extern int moncontrol(int);
  81         moncontrol(enable);
  82 #endif
  83 }
  84
  85
  86 /*
  87 ===============================================================================
  88
  89 DLL MANAGEMENT
  90
  91 ===============================================================================
  92 */
  93
  94 static qboolean Sys_LoadLibraryFunctions(dllhandle_t dllhandle, const dllfunction_t *fcts, qboolean complain, qboolean has_next)
  95 {
  96         const dllfunction_t *func;
  97         if(dllhandle)
  98         {
  99                 for (func = fcts; func && func->name != NULL; func++)
 100                         if (!(*func->funcvariable = (void *) Sys_GetProcAddress (dllhandle, func->name)))
 101                         {
 102                                 if(complain)
 103                                 {
 104                                         Con_DPrintf (" - missing function \"%s\" - broken library!", func->name);
 105                                         if(has_next)
 106                                                 Con_DPrintf("\nContinuing with");
 107                                 }
 108                                 goto notfound;
 109                         }
 110                 return true;
 111
 112         notfound:
 113                 for (func = fcts; func && func->name != NULL; func++)
 114                         *func->funcvariable = NULL;
 115         }
 116         return false;
 117 }
 118
 119 qboolean Sys_LoadLibrary (const char** dllnames, dllhandle_t* handle, const dllfunction_t *fcts)
 120 {
 121 #ifdef SUPPORTDLL
 122         const dllfunction_t *func;
 123         dllhandle_t dllhandle = 0;
 124         unsigned int i;
 125
 126         if (handle == NULL)
 127                 return false;
 128
 129 #ifndef WIN32
 130 #ifdef PREFER_PRELOAD
 131         dllhandle = dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL);
 132         if(Sys_LoadLibraryFunctions(dllhandle, fcts, false, false))
 133         {
 134                 Con_DPrintf ("All of %s's functions were already linked in! Not loading dynamically...\n", dllnames[0]);
 135                 *handle = dllhandle;
 136                 return true;
 137         }
 138         else
 139                 Sys_UnloadLibrary(&dllhandle);
 140 notfound:
 141 #endif
 142 #endif
 143
 144         // Initializations
 145         for (func = fcts; func && func->name != NULL; func++)
 146                 *func->funcvariable = NULL;
 147
 148         // Try every possible name
 149         Con_DPrintf ("Trying to load library...");
 150         for (i = 0; dllnames[i] != NULL; i++)
 151         {
 152                 Con_DPrintf (" \"%s\"", dllnames[i]);
 153 #ifdef WIN32
 154 # ifndef DONT_USE_SETDLLDIRECTORY
 155 #  ifdef _WIN64
 156                 SetDllDirectory("bin64");
 157 #  else
 158                 SetDllDirectory("bin32");
 159 #  endif
 160 # endif
 161                 dllhandle = LoadLibrary (dllnames[i]);
 162                 // no need to unset this - we want ALL dlls to be loaded from there, anyway
 163 #else
 164                 dllhandle = dlopen (dllnames[i], RTLD_LAZY | RTLD_GLOBAL);
 165 #endif
 166                 if (Sys_LoadLibraryFunctions(dllhandle, fcts, true, (dllnames[i+1] != NULL) || (strrchr(sys.argv[0], '/'))))
 167                         break;
 168                 else
 169                         Sys_UnloadLibrary (&dllhandle);
 170         }
 171
 172         // see if the names can be loaded relative to the executable path
 173         // (this is for Mac OSX which does not check next to the executable)
 174         if (!dllhandle && strrchr(sys.argv[0], '/'))
 175         {
 176                 char path[MAX_OSPATH];
 177                 strlcpy(path, sys.argv[0], sizeof(path));
 178                 strrchr(path, '/')[1] = 0;
 179                 for (i = 0; dllnames[i] != NULL; i++)
 180                 {
 181                         char temp[MAX_OSPATH];
 182                         strlcpy(temp, path, sizeof(temp));
 183                         strlcat(temp, dllnames[i], sizeof(temp));
 184                         Con_DPrintf (" \"%s\"", temp);
 185 #ifdef WIN32
 186                         dllhandle = LoadLibrary (temp);
 187 #else
 188                         dllhandle = dlopen (temp, RTLD_LAZY | RTLD_GLOBAL);
 189 #endif
 190                         if (Sys_LoadLibraryFunctions(dllhandle, fcts, true, dllnames[i+1] != NULL))
 191                                 break;
 192                         else
 193                                 Sys_UnloadLibrary (&dllhandle);
 194                 }
 195         }
 196
 197         // No DLL found
 198         if (! dllhandle)
 199         {
 200                 Con_DPrintf(" - failed.\n");
 201                 return false;
 202         }
 203
 204         Con_DPrintf(" - loaded.\n");
 205
 206         *handle = dllhandle;
 207         return true;
 208 #else
 209         return false;
 210 #endif
 211 }
 212
 213 void Sys_UnloadLibrary (dllhandle_t* handle)
 214 {
 215 #ifdef SUPPORTDLL
 216         if (handle == NULL || *handle == NULL)
 217                 return;
 218
 219 #ifdef WIN32
 220         FreeLibrary (*handle);
 221 #else
 222         dlclose (*handle);
 223 #endif
 224
 225         *handle = NULL;
 226 #endif
 227 }
 228
 229 void* Sys_GetProcAddress (dllhandle_t handle, const char* name)
 230 {
 231 #ifdef SUPPORTDLL
 232 #ifdef WIN32
 233         return (void *)GetProcAddress (handle, name);
 234 #else
 235         return (void *)dlsym (handle, name);
 236 #endif
 237 #else
 238         return NULL;
 239 #endif
 240 }
 241
 242 #ifdef WIN32
 243 # define HAVE_TIMEGETTIME 1
 244 # define HAVE_QUERYPERFORMANCECOUNTER 1
 245 # define HAVE_Sleep 1
 246 #endif
 247
 248 #ifndef WIN32
 249 #if defined(CLOCK_MONOTONIC) || defined(CLOCK_HIRES)
 250 # define HAVE_CLOCKGETTIME 1
 251 #endif
 252 // FIXME improve this check, manpage hints to DST_NONE
 253 # define HAVE_GETTIMEOFDAY 1
 254 #endif
 255
 256 #ifndef WIN32
 257 // on Win32, select() cannot be used with all three FD list args being NULL according to MSDN
 258 // (so much for POSIX...)
 259 # ifdef FD_SET
 260 #  define HAVE_SELECT 1
 261 # endif
 262 #endif
 263
 264 #ifndef WIN32
 265 // FIXME improve this check
 266 # define HAVE_USLEEP 1
 267 #endif
 268
 269 // this one is referenced elsewhere
 270 cvar_t sys_usenoclockbutbenchmark = {CVAR_CLIENT | CVAR_SERVER | CVAR_SAVE, "sys_usenoclockbutbenchmark", "0", "don't use ANY real timing, and simulate a clock (for benchmarking); the game then runs as fast as possible. Run a QC mod with bots that does some stuff, then does a quit at the end, to benchmark a server. NEVER do this on a public server."};
 271
 272 // these are not
 273 static cvar_t sys_debugsleep = {CVAR_CLIENT | CVAR_SERVER, "sys_debugsleep", "0", "write requested and attained sleep times to standard output, to be used with gnuplot"};
 274 static cvar_t sys_usesdlgetticks = {CVAR_CLIENT | CVAR_SERVER | CVAR_SAVE, "sys_usesdlgetticks", "0", "use SDL_GetTicks() timer (less accurate, for debugging)"};
 275 static cvar_t sys_usesdldelay = {CVAR_CLIENT | CVAR_SERVER | CVAR_SAVE, "sys_usesdldelay", "0", "use SDL_Delay() (less accurate, for debugging)"};
 276 #if HAVE_QUERYPERFORMANCECOUNTER
 277 static cvar_t sys_usequeryperformancecounter = {CVAR_CLIENT | CVAR_SERVER | CVAR_SAVE, "sys_usequeryperformancecounter", "0", "use windows QueryPerformanceCounter timer (which has issues on multicore/multiprocessor machines and processors which are designed to conserve power) for timing rather than timeGetTime function (which has issues on some motherboards)"};
 278 #endif
 279 #if HAVE_CLOCKGETTIME
 280 static cvar_t sys_useclockgettime = {CVAR_CLIENT | CVAR_SERVER | CVAR_SAVE, "sys_useclockgettime", "1", "use POSIX clock_gettime function (not adjusted by NTP on some older Linux kernels) for timing rather than gettimeofday (which has issues if the system time is stepped by ntpdate, or apparently on some Xen installations)"};
 281 #endif
 282
 283 static double benchmark_time; // actually always contains an integer amount of milliseconds, will eventually "overflow"
 284
 285 void Sys_Init_Commands (void)
 286 {
 287         Cvar_RegisterVariable(&sys_debugsleep);
 288         Cvar_RegisterVariable(&sys_usenoclockbutbenchmark);
 289 #if HAVE_TIMEGETTIME || HAVE_QUERYPERFORMANCECOUNTER || HAVE_CLOCKGETTIME || HAVE_GETTIMEOFDAY
 290         if(sys_supportsdlgetticks)
 291         {
 292                 Cvar_RegisterVariable(&sys_usesdlgetticks);
 293                 Cvar_RegisterVariable(&sys_usesdldelay);
 294         }
 295 #endif
 296 #if HAVE_QUERYPERFORMANCECOUNTER
 297         Cvar_RegisterVariable(&sys_usequeryperformancecounter);
 298 #endif
 299 #if HAVE_CLOCKGETTIME
 300         Cvar_RegisterVariable(&sys_useclockgettime);
 301 #endif
 302 }
 303
 304 double Sys_DirtyTime(void)
 305 {
 306         // first all the OPTIONAL timers
 307
 308         // benchmark timer (fake clock)
 309         if(sys_usenoclockbutbenchmark.integer)
 310         {
 311                 double old_benchmark_time = benchmark_time;
 312                 benchmark_time += 1;
 313                 if(benchmark_time == old_benchmark_time)
 314                         Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
 315                 return benchmark_time * 0.000001;
 316         }
 317 #if HAVE_QUERYPERFORMANCECOUNTER
 318         if (sys_usequeryperformancecounter.integer)
 319         {
 320                 // LadyHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
 321                 // QueryPerformanceCounter
 322                 // platform:
 323                 // Windows 95/98/ME/NT/2000/XP
 324                 // features:
 325                 // very accurate (CPU cycles)
 326                 // known issues:
 327                 // does not necessarily match realtime too well (tends to get faster and faster in win98)
 328                 // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
 329                 double timescale;
 330                 LARGE_INTEGER PerformanceFreq;
 331                 LARGE_INTEGER PerformanceCount;
 332
 333                 if (QueryPerformanceFrequency (&PerformanceFreq))
 334                 {
 335                         QueryPerformanceCounter (&PerformanceCount);
 336
 337                         timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
 338                         return ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
 339                 }
 340                 else
 341                 {
 342                         Con_Printf("No hardware timer available\n");
 343                         // fall back to other clock sources
 344                         Cvar_SetValueQuick(&sys_usequeryperformancecounter, false);
 345                 }
 346         }
 347 #endif
 348
 349 #if HAVE_CLOCKGETTIME
 350         if (sys_useclockgettime.integer)
 351         {
 352                 struct timespec ts;
 353 #  ifdef CLOCK_MONOTONIC
 354                 // linux
 355                 clock_gettime(CLOCK_MONOTONIC, &ts);
 356 #  else
 357                 // sunos
 358                 clock_gettime(CLOCK_HIGHRES, &ts);
 359 #  endif
 360                 return (double) ts.tv_sec + ts.tv_nsec / 1000000000.0;
 361         }
 362 #endif
 363
 364         // now all the FALLBACK timers
 365         if(sys_supportsdlgetticks && sys_usesdlgetticks.integer)
 366                 return (double) Sys_SDL_GetTicks() / 1000.0;
 367 #if HAVE_GETTIMEOFDAY
 368         {
 369                 struct timeval tp;
 370                 gettimeofday(&tp, NULL);
 371                 return (double) tp.tv_sec + tp.tv_usec / 1000000.0;
 372         }
 373 #elif HAVE_TIMEGETTIME
 374         {
 375                 static int firsttimegettime = true;
 376                 // timeGetTime
 377                 // platform:
 378                 // Windows 95/98/ME/NT/2000/XP
 379                 // features:
 380                 // reasonable accuracy (millisecond)
 381                 // issues:
 382                 // wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
 383
 384                 // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
 385                 if (firsttimegettime)
 386                 {
 387                         timeBeginPeriod(1);
 388                         firsttimegettime = false;
 389                 }
 390
 391                 return (double) timeGetTime() / 1000.0;
 392         }
 393 #else
 394         // fallback for using the SDL timer if no other timer is available
 395         // this calls Sys_Error() if not linking against SDL
 396         return (double) Sys_SDL_GetTicks() / 1000.0;
 397 #endif
 398 }
 399
 400 void Sys_Sleep(int microseconds)
 401 {
 402         double t = 0;
 403         if(sys_usenoclockbutbenchmark.integer)
 404         {
 405                 if(microseconds)
 406                 {
 407                         double old_benchmark_time = benchmark_time;
 408                         benchmark_time += microseconds;
 409                         if(benchmark_time == old_benchmark_time)
 410                                 Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
 411                 }
 412                 return;
 413         }
 414         if(sys_debugsleep.integer)
 415         {
 416                 t = Sys_DirtyTime();
 417         }
 418         if(sys_supportsdlgetticks && sys_usesdldelay.integer)
 419         {
 420                 Sys_SDL_Delay(microseconds / 1000);
 421         }
 422 #if HAVE_SELECT
 423         else
 424         {
 425                 struct timeval tv;
 426                 tv.tv_sec = microseconds / 1000000;
 427                 tv.tv_usec = microseconds % 1000000;
 428                 select(0, NULL, NULL, NULL, &tv);
 429         }
 430 #elif HAVE_USLEEP
 431         else
 432         {
 433                 usleep(microseconds);
 434         }
 435 #elif HAVE_Sleep
 436         else
 437         {
 438                 Sleep(microseconds / 1000);
 439         }
 440 #else
 441         else
 442         {
 443                 Sys_SDL_Delay(microseconds / 1000);
 444         }
 445 #endif
 446         if(sys_debugsleep.integer)
 447         {
 448                 t = Sys_DirtyTime() - t;
 449                 Sys_PrintfToTerminal("%d %d # debugsleep\n", microseconds, (unsigned int)(t * 1000000));
 450         }
 451 }
 452
 453 void Sys_PrintfToTerminal(const char *fmt, ...)
 454 {
 455         va_list argptr;
 456         char msg[MAX_INPUTLINE];
 457
 458         va_start(argptr,fmt);
 459         dpvsnprintf(msg,sizeof(msg),fmt,argptr);
 460         va_end(argptr);
 461
 462         Sys_PrintToTerminal(msg);
 463 }
 464
 465 #ifndef WIN32
 466 static const char *Sys_FindInPATH(const char *name, char namesep, const char *PATH, char pathsep, char *buf, size_t bufsize)
 467 {
 468         const char *p = PATH;
 469         const char *q;
 470         if(p && name)
 471         {
 472                 while((q = strchr(p, ':')))
 473                 {
 474                         dpsnprintf(buf, bufsize, "%.*s%c%s", (int)(q-p), p, namesep, name);
 475                         if(FS_SysFileExists(buf))
 476                                 return buf;
 477                         p = q + 1;
 478                 }
 479                 if(!q) // none found - try the last item
 480                 {
 481                         dpsnprintf(buf, bufsize, "%s%c%s", p, namesep, name);
 482                         if(FS_SysFileExists(buf))
 483                                 return buf;
 484                 }
 485         }
 486         return name;
 487 }
 488 #endif
 489
 490 static const char *Sys_FindExecutableName(void)
 491 {
 492 #if defined(WIN32)
 493         return sys.argv[0];
 494 #else
 495         static char exenamebuf[MAX_OSPATH+1];
 496         ssize_t n = -1;
 497 #if defined(__FreeBSD__)
 498         int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
 499         size_t exenamebuflen = sizeof(exenamebuf)-1;
 500         if (sysctl(mib, 4, exenamebuf, &exenamebuflen, NULL, 0) == 0)
 501         {
 502                 n = exenamebuflen;
 503         }
 504 #elif defined(__linux__)
 505         n = readlink("/proc/self/exe", exenamebuf, sizeof(exenamebuf)-1);
 506 #endif
 507         if(n > 0 && (size_t)(n) < sizeof(exenamebuf))
 508         {
 509                 exenamebuf[n] = 0;
 510                 return exenamebuf;
 511         }
 512         if(strchr(sys.argv[0], '/'))
 513                 return sys.argv[0]; // possibly a relative path
 514         else
 515                 return Sys_FindInPATH(sys.argv[0], '/', getenv("PATH"), ':', exenamebuf, sizeof(exenamebuf));
 516 #endif
 517 }
 518
 519 void Sys_ProvideSelfFD(void)
 520 {
 521         if(sys.selffd != -1)
 522                 return;
 523         sys.selffd = FS_SysOpenFD(Sys_FindExecutableName(), "rb", false);
 524 }
 525
 526 // for x86 cpus only...  (x64 has SSE2_PRESENT)
 527 #if defined(SSE_POSSIBLE) && !defined(SSE2_PRESENT)
 528 // code from SDL, shortened as we can expect CPUID to work
 529 static int CPUID_Features(void)
 530 {
 531         int features = 0;
 532 # if defined((__GNUC__) || (__clang__) || (__TINYC__)) && defined(__i386__)
 533         __asm__ (
 534 "        movl    %%ebx,%%edi\n"
 535 "        xorl    %%eax,%%eax                                           \n"
 536 "        incl    %%eax                                                 \n"
 537 "        cpuid                       # Get family/model/stepping/features\n"
 538 "        movl    %%edx,%0                                              \n"
 539 "        movl    %%edi,%%ebx\n"
 540         : "=m" (features)
 541         :
 542         : "%eax", "%ecx", "%edx", "%edi"
 543         );
 544 # elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
 545         __asm {
 546         xor     eax, eax
 547         inc     eax
 548         cpuid                       ; Get family/model/stepping/features
 549         mov     features, edx
 550         }
 551 # else
 552 #  error SSE_POSSIBLE set but no CPUID implementation
 553 # endif
 554         return features;
 555 }
 556 #endif
 557
 558 #ifdef SSE_POSSIBLE
 559 qboolean Sys_HaveSSE(void)
 560 {
 561         // COMMANDLINEOPTION: SSE: -nosse disables SSE support and detection
 562         if(COM_CheckParm("-nosse"))
 563                 return false;
 564 #ifdef SSE_PRESENT
 565         return true;
 566 #else
 567         // COMMANDLINEOPTION: SSE: -forcesse enables SSE support and disables detection
 568         if(COM_CheckParm("-forcesse") || COM_CheckParm("-forcesse2"))
 569                 return true;
 570         if(CPUID_Features() & (1 << 25))
 571                 return true;
 572         return false;
 573 #endif
 574 }
 575
 576 qboolean Sys_HaveSSE2(void)
 577 {
 578         // COMMANDLINEOPTION: SSE2: -nosse2 disables SSE2 support and detection
 579         if(COM_CheckParm("-nosse") || COM_CheckParm("-nosse2"))
 580                 return false;
 581 #ifdef SSE2_PRESENT
 582         return true;
 583 #else
 584         // COMMANDLINEOPTION: SSE2: -forcesse2 enables SSE2 support and disables detection
 585         if(COM_CheckParm("-forcesse2"))
 586                 return true;
 587         if((CPUID_Features() & (3 << 25)) == (3 << 25)) // SSE is 1<<25, SSE2 is 1<<26
 588                 return true;
 589         return false;
 590 #endif
 591 }
 592 #endif
 593
 594 /// called to set process priority for dedicated servers
 595 #if defined(__linux__)
 596 #include <sys/resource.h>
 597 #include <errno.h>
 598
 599 void Sys_InitProcessNice (void)
 600 {
 601         struct rlimit lim;
 602         sys.nicepossible = false;
 603         if(COM_CheckParm("-nonice"))
 604                 return;
 605         errno = 0;
 606         sys.nicelevel = getpriority(PRIO_PROCESS, 0);
 607         if(errno)
 608         {
 609                 Con_Printf("Kernel does not support reading process priority - cannot use niceness\n");
 610                 return;
 611         }
 612         if(getrlimit(RLIMIT_NICE, &lim))
 613         {
 614                 Con_Printf("Kernel does not support lowering nice level again - cannot use niceness\n");
 615                 return;
 616         }
 617         if(lim.rlim_cur != RLIM_INFINITY && sys.nicelevel < (int) (20 - lim.rlim_cur))
 618         {
 619                 Con_Printf("Current nice level is below the soft limit - cannot use niceness\n");
 620                 return;
 621         }
 622         sys.nicepossible = true;
 623         sys.isnice = false;
 624 }
 625 void Sys_MakeProcessNice (void)
 626 {
 627         if(!sys.nicepossible)
 628                 return;
 629         if(sys.isnice)
 630                 return;
 631         Con_DPrintf("Process is becoming 'nice'...\n");
 632         if(setpriority(PRIO_PROCESS, 0, 19))
 633                 Con_Printf(CON_ERROR "Failed to raise nice level to %d\n", 19);
 634         sys.isnice = true;
 635 }
 636 void Sys_MakeProcessMean (void)
 637 {
 638         if(!sys.nicepossible)
 639                 return;
 640         if(!sys.isnice)
 641                 return;
 642         Con_DPrintf("Process is becoming 'mean'...\n");
 643         if(setpriority(PRIO_PROCESS, 0, sys.nicelevel))
 644                 Con_Printf(CON_ERROR "Failed to lower nice level to %d\n", sys.nicelevel);
 645         sys.isnice = false;
 646 }
 647 #else
 648 void Sys_InitProcessNice (void)
 649 {
 650 }
 651 void Sys_MakeProcessNice (void)
 652 {
 653 }
 654 void Sys_MakeProcessMean (void)
 655 {
 656 }
 657 #endif