+ if (sv.active && sv_timer > 0)
+ {
+ // execute one or more server frames, with an upper limit on how much
+ // execution time to spend on server frames to avoid freezing the game if
+ // the server is overloaded, this execution time limit means the game will
+ // slow down if the server is taking too long.
+ int framecount, framelimit = 1;
+ double advancetime, aborttime = 0;
+ float offset;
+
+ // run the world state
+ // don't allow simulation to run too fast or too slow or logic glitches can occur
+
+ // stop running server frames if the wall time reaches this value
+ if (sys_ticrate.value <= 0)
+ advancetime = sv_timer;
+ else if (cl.islocalgame && !sv_fixedframeratesingleplayer.integer)
+ {
+ // synchronize to the client frametime, but no less than 10ms and no more than sys_ticrate
+ advancetime = bound(0.01, cl_timer, sys_ticrate.value);
+ framelimit = 10;
+ aborttime = realtime + 0.1;
+ }
+ else
+ {
+ advancetime = sys_ticrate.value;
+ // listen servers can run multiple server frames per client frame
+ if (cls.state == ca_connected)
+ {
+ framelimit = 10;
+ aborttime = realtime + 0.1;
+ }
+ }
+ advancetime = min(advancetime, 0.1);
+
+ if(advancetime > 0)
+ {
+ offset = sv_timer + (Sys_DoubleTime() - realtime);
+ ++svs.perf_acc_offset_samples;
+ svs.perf_acc_offset += offset;
+ svs.perf_acc_offset_squared += offset * offset;
+ if(svs.perf_acc_offset_max < offset)
+ svs.perf_acc_offset_max = offset;
+ }
+
+ // only advance time if not paused
+ // the game also pauses in singleplayer when menu or console is used
+ sv.frametime = advancetime * slowmo.value;
+ if (host_framerate.value)
+ sv.frametime = host_framerate.value;
+ if (sv.paused || (cl.islocalgame && (key_dest != key_game || key_consoleactive)))
+ sv.frametime = 0;
+
+ // setup the VM frame
+ SV_VM_Begin();
+
+ for (framecount = 0;framecount < framelimit && sv_timer > 0;framecount++)
+ {
+ sv_timer -= advancetime;
+
+ // move things around and think unless paused
+ if (sv.frametime)
+ SV_Physics();
+
+ // if this server frame took too long, break out of the loop
+ if (framelimit > 1 && Sys_DoubleTime() >= aborttime)
+ break;
+ }
+
+ // send all messages to the clients
+ SV_SendClientMessages();
+
+ if (sv.paused == 1 && realtime > sv.pausedstart && sv.pausedstart > 0) {
+ prog->globals.generic[OFS_PARM0] = realtime - sv.pausedstart;
+ PRVM_ExecuteProgram(prog->funcoffsets.SV_PausedTic, "QC function SV_PausedTic is missing");
+ }
+
+ // end the server VM frame
+ SV_VM_End();
+
+ // send an heartbeat if enough time has passed since the last one
+ NetConn_Heartbeat(0);
+ }