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// DeadlockDetect.cpp
// Declares the cDeadlockDetect class that tries to detect deadlocks and aborts the server when it detects one
#include "Globals.h"
#include "DeadlockDetect.h"
#include "Root.h"
#include "World.h"
/// Number of milliseconds per cycle
const int CYCLE_MILLISECONDS = 100;
/// When the number of cycles for the same world age hits this value, it is considered a deadlock
const int NUM_CYCLES_LIMIT = 200; // 200 = twenty seconds
cDeadlockDetect::cDeadlockDetect(void) :
super("DeadlockDetect")
{
}
bool cDeadlockDetect::Start(void)
{
// Read the initial world data:
class cFillIn :
public cWorldListCallback
{
public:
cFillIn(cDeadlockDetect * a_Detect) :
m_Detect(a_Detect)
{
}
virtual bool Item(cWorld * a_World) override
{
m_Detect->SetWorldAge(a_World->GetName(), a_World->GetWorldAge());
return false;
}
protected:
cDeadlockDetect * m_Detect;
} FillIn(this);
cRoot::Get()->ForEachWorld(FillIn);
return super::Start();
}
void cDeadlockDetect::Execute(void)
{
// Loop until the event is signalled
while (!m_ShouldTerminate)
{
// Check the world ages:
class cChecker :
public cWorldListCallback
{
public:
cChecker(cDeadlockDetect * a_Detect) :
m_Detect(a_Detect)
{
}
protected:
cDeadlockDetect * m_Detect;
virtual bool Item(cWorld * a_World) override
{
m_Detect->CheckWorldAge(a_World->GetName(), a_World->GetWorldAge());
return false;
}
} Checker(this);
cRoot::Get()->ForEachWorld(Checker);
cSleep::MilliSleep(CYCLE_MILLISECONDS);
} // while (should run)
}
void cDeadlockDetect::SetWorldAge(const AString & a_WorldName, Int64 a_Age)
{
m_WorldAges[a_WorldName].m_Age = a_Age;
m_WorldAges[a_WorldName].m_NumCyclesSame = 0;
}
void cDeadlockDetect::CheckWorldAge(const AString & a_WorldName, Int64 a_Age)
{
WorldAges::iterator itr = m_WorldAges.find(a_WorldName);
if (itr == m_WorldAges.end())
{
ASSERT(!"Unknown world in cDeadlockDetect");
return;
}
if (itr->second.m_Age == a_Age)
{
itr->second.m_NumCyclesSame += 1;
if (itr->second.m_NumCyclesSame > NUM_CYCLES_LIMIT)
{
DeadlockDetected();
return;
}
}
else
{
itr->second.m_Age = a_Age;
itr->second.m_NumCyclesSame = 0;
}
}
void cDeadlockDetect::DeadlockDetected(void)
{
ASSERT(!"Deadlock detected");
// TODO: Make a crashdump / coredump
// Crash the server intentionally:
*((int *)0) = 0;
}
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