Detecting Deadlocks in C++ Using a Locks Monitor
By Tomer Abramson, April 01, 2003
In multithreaded programming, locking mechanisms are a must in order to keep data consistent. This article will discuss a technique for detecting and breaking deadlocks in multithreaded environment. It will also present a simple and powerful way to analyze why the deadlock occurred.
Detecting Deadlocks in C++ Using a Locks Monitor
Listing 2 MyWaitForSingleObject && MyReleaseMutex
#include "locksWrapper.h"
void MyWaitForSingleObject(HANDLE hResource, DWORD dwMilliseconds)
{
PostThreadMessage(CLocksMonitorMgr::GetLMThreadId(), WM_LM_TRY_LOCK, (WPARAM)GetCurrentThreadId(), (LPARAM)hResource);
WaitForSingleObject(hResource, dwMilliseconds);
PostThreadMessage(CLocksMonitorMgr::GetLMThreadId(), WM_LM_OWN_LOCK, (WPARAM)GetCurrentThreadId(), (LPARAM)hResource);
}
void MyReleaseMutex(HANDLE hMutex)
{
ReleaseMutex(hMutex);
PostThreadMessage(CLocksMonitorMgr::GetLMThreadId(), WM_LM_RELEASE_LOCK, (WPARAM)GetCurrentThreadId(), (LPARAM)hMutex);
}
