summaryrefslogtreecommitdiffstats
path: root/src/DeadlockDetect.h
diff options
context:
space:
mode:
authorAlexander Harkness <bearbin@gmail.com>2013-11-24 15:19:41 +0100
committerAlexander Harkness <bearbin@gmail.com>2013-11-24 15:19:41 +0100
commit675b4aa878f16291ce33fced48a2bc7425f635ae (patch)
tree409914df27a98f65adf866da669429c4de141b6f /src/DeadlockDetect.h
parentLineBlockTracer: Using the coord-based block faces. (diff)
downloadcuberite-675b4aa878f16291ce33fced48a2bc7425f635ae.tar
cuberite-675b4aa878f16291ce33fced48a2bc7425f635ae.tar.gz
cuberite-675b4aa878f16291ce33fced48a2bc7425f635ae.tar.bz2
cuberite-675b4aa878f16291ce33fced48a2bc7425f635ae.tar.lz
cuberite-675b4aa878f16291ce33fced48a2bc7425f635ae.tar.xz
cuberite-675b4aa878f16291ce33fced48a2bc7425f635ae.tar.zst
cuberite-675b4aa878f16291ce33fced48a2bc7425f635ae.zip
Diffstat (limited to 'src/DeadlockDetect.h')
-rw-r--r--src/DeadlockDetect.h65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/DeadlockDetect.h b/src/DeadlockDetect.h
new file mode 100644
index 000000000..2559c3fff
--- /dev/null
+++ b/src/DeadlockDetect.h
@@ -0,0 +1,65 @@
+
+// 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(void);
+
+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;
+
+
+ // 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);
+} ;
+
+
+
+