Linux dedicated server: set nice -19 while spawning server (can be turned off by...

[xonotic/darkplaces.git] / sys_shared.c

diff --git a/sys_shared.c b/sys_shared.c
index cb826f17b6a53dd0e04af91249459479ece8b450..bcbc727d902e04074befee164b481592563ea36d 100644 (file)
--- a/sys_shared.c
+++ b/sys_shared.c
@@ -561,3 +561,70 @@ qboolean Sys_HaveSSE2(void)
        return false;
 }
 #endif
+
+/// called to set process priority for dedicated servers
+#if defined(__linux__)
+#include <sys/resource.h>
+#include <errno.h>
+static int nicelevel;
+static qboolean nicepossible;
+static qboolean isnice;
+void Sys_InitProcessNice (void)
+{
+       struct rlimit lim;
+       nicepossible = false;
+       if(COM_CheckParm("-nonice"))
+               return;
+       errno = 0;
+       nicelevel = getpriority(PRIO_PROCESS, 0);
+       if(errno)
+       {
+               Con_Printf("Kernel does not support reading process priority - cannot use niceness\n");
+               return;
+       }
+       if(getrlimit(RLIMIT_NICE, &lim))
+       {
+               Con_Printf("Kernel does not support lowering nice level again - cannot use niceness\n");
+               return;
+       }
+       if(lim.rlim_cur != RLIM_INFINITY && nicelevel < (int) (20 - lim.rlim_cur))
+       {
+               Con_Printf("Current nice level is below the soft limit - cannot use niceness\n");
+               return;
+       }
+       nicepossible = true;
+       isnice = false;
+}
+void Sys_MakeProcessNice (void)
+{
+       if(!nicepossible)
+               return;
+       if(isnice)
+               return;
+       Con_DPrintf("Process is becoming 'nice'...\n");
+       if(setpriority(PRIO_PROCESS, 0, 19))
+               Con_Printf("Failed to raise nice level to %d\n", 19);
+       isnice = true;
+}
+void Sys_MakeProcessMean (void)
+{
+       if(!nicepossible)
+               return;
+       if(!isnice)
+               return;
+       Con_DPrintf("Process is becoming 'mean'...\n");
+       if(setpriority(PRIO_PROCESS, 0, nicelevel))
+               Con_Printf("Failed to lower nice level to %d\n", nicelevel);
+       isnice = false;
+}
+#else
+void Sys_InitProcessNice (void)
+{
+}
+void Sys_MakeProcessNice (void)
+{
+}
+void Sys_MakeProcessMean (void)
+{
+}
+#endif