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authorworktycho <work.tycho@gmail.com>2013-12-09 18:51:12 +0100
committerworktycho <work.tycho@gmail.com>2013-12-09 18:51:12 +0100
commit843605d59ebc128be0a578dc6f45ef8c05da6e79 (patch)
tree3ffebc6ba27baf7a9e1d4bc51501ffeea9b14226 /src/DeadlockDetect.h
parentmerged makefile changes (diff)
parentFix Undefined behavior at Bindings/LuaWindow line 32 (diff)
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diff --git a/src/DeadlockDetect.h b/src/DeadlockDetect.h
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+
+// DeadlockDetect.h
+
+// Declares the cDeadlockDetect class that tries to detect deadlocks and aborts the server when it detects one
+
+/*
+This class simply monitors each world's m_WorldAge, which is expected to grow on each tick.
+If the world age doesn't grow for several seconds, it's either because the server is super-overloaded,
+or because the world tick thread hangs in a deadlock. We presume the latter and therefore kill the server.
+Once we learn to write crashdumps programmatically, we should do so just before killing, to enable debugging.
+*/
+
+
+
+#pragma once
+
+#include "OSSupport/IsThread.h"
+
+
+
+
+
+class cDeadlockDetect :
+ public cIsThread
+{
+ typedef cIsThread super;
+
+public:
+ cDeadlockDetect(void);
+
+ /// Starts the detection. Hides cIsThread's Start, because we need some initialization
+ bool Start(int a_IntervalSec);
+
+protected:
+ struct sWorldAge
+ {
+ /// Last m_WorldAge that has been detected in this world
+ Int64 m_Age;
+
+ /// Number of cycles for which the age has been the same
+ int m_NumCyclesSame;
+ } ;
+
+ /// Maps world name -> sWorldAge
+ typedef std::map<AString, sWorldAge> WorldAges;
+
+ WorldAges m_WorldAges;
+
+ /// Number of secods for which the ages must be the same for the detection to trigger
+ int m_IntervalSec;
+
+
+ // cIsThread overrides:
+ virtual void Execute(void) override;
+
+ /// Sets the initial world age
+ void SetWorldAge(const AString & a_WorldName, Int64 a_Age);
+
+ /// Checks if the world's age has changed, updates the world's stats; calls DeadlockDetected() if deadlock detected
+ void CheckWorldAge(const AString & a_WorldName, Int64 a_Age);
+
+ /// Called when a deadlock is detected. Aborts the server.
+ void DeadlockDetected(void);
+} ;
+
+
+
+