Difference between revisions of "Watchdog"
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These are some simple scripts that watch other scripts in the same prim and restarts them if they crash. | These are some simple scripts that watch other scripts in the same prim and restarts them if they crash. | ||
'''Design Principle''' | |||
First and foremost, a watchdog needs to be very robust. Small and simple is better. Performance is not a high priority and a watchdog does not need to run at a high rate of speed. For these reasons, these code examples have been written with timed self-resets, to keep the heap space clean. No fancy tricks that could lead to potential problems (more parts to break) have been left out. | |||
'''BASIC LSL WATCHDOG FOR A SINGLE PRIMARY SCRIPT''' | '''BASIC LSL WATCHDOG FOR A SINGLE PRIMARY SCRIPT''' |
Revision as of 03:53, 17 January 2012
LSL WATCHDOG
These are some simple scripts that watch other scripts in the same prim and restarts them if they crash.
Design Principle
First and foremost, a watchdog needs to be very robust. Small and simple is better. Performance is not a high priority and a watchdog does not need to run at a high rate of speed. For these reasons, these code examples have been written with timed self-resets, to keep the heap space clean. No fancy tricks that could lead to potential problems (more parts to break) have been left out.
BASIC LSL WATCHDOG FOR A SINGLE PRIMARY SCRIPT <lsl> // Basic LSL Watchdog Script to watch a single script // 2012-01-17 By Tika Oberueng // Released to the public domain. // You break it, you get to keep both pieces. // string watchee = "Test"; // Set this to the name of a script in prim inventory to watch float interval = 60.0; // Number of seconds between watchdog checks. Probably best to keep this above >= 10
default {
state_entry() { llSetTimerEvent(interval); } on_rez(integer param) { llResetScript(); } timer() { llSetTimerEvent(0); if (!llGetScriptState(watchee)) { llResetOtherScript(watchee); llSetScriptState(watchee, TRUE); llRegionSay(DEBUG_CHANNEL, "Watchdog Trip: The script ["+watchee+"] has crashed and has been restarted."); } llSleep(1); llResetScript(); // Reset this script to keep it clean }
} </lsl>
BASIC LSL WATCHDOG FOR MULTIPLE SCRIPTS <lsl> // Basic LSL Watchdog Script to watch multiple scripts // 2012-01-17 By Tika Oberueng // Released to the public domain. // You break it, you get to keep both pieces. // float interval = 60.0; // Number of seconds between watchdog checks. Probably best to keep this above >= 10
default {
state_entry() { llSetTimerEvent(interval); } on_rez(integer param) { llResetScript(); } timer() { integer loop; string watchee; llSetTimerEvent(0); for (loop = llGetInventoryNumber(INVENTORY_SCRIPT) -1; loop > -1; --loop) { watchee = llGetInventoryName(INVENTORY_SCRIPT,loop); if (!llGetScriptState(watchee)) { if (watchee != llGetScriptName()) { llResetOtherScript(watchee); llSetScriptState(watchee, TRUE); llRegionSay(DEBUG_CHANNEL, "Multiple Watchdog Trip: The script ["+watchee+"] has crashed and has been restarted."); } } } llSleep(1); llResetScript(); // Reset this script to keep it clean }
} </lsl>