C application hangs intermittently on invoking Closehandle() function in Win 7 64bit OS

Question

Hi,
I have a application which basically deals with network operations like begin session, send/receive etc. The application also has mutex create, request and close. Before terminating the transaction between the client and server, there is a call to Closehandle()
while clears that mutex that was created during initialization. (Mutex is released prior to close). During closing the mutex, in Windows 7 64 bit OS, the application goes to hung state intermittently. The same application used work without any issues in Win
XP. 
PS: The C application is written in Visual Studio 6.0
Hence requesting for any thoughts to resolve this problem!!
Thanks in Advance!

Answer 1

Hi,
When application hangs, it needs to be restarted. Yes, this problems happens sometimes.
With respect to the anti-virus and firewalls, I had tried turned off firewalls and anti-virus but did not help!
This application basically acts as a network layer which is the bridge between client and server.
Below is the code snippet from the app which shows about mutex creation, request and close. I had configured ADPlus to the application to check on which line of the code the hang occurs and from that dump file could notice that the cause for the hang is
Closehandle() function.
Code snippet -
typedef unsigned long OSLMUTEXSEM;
extern OSLMUTEXSEM gsemCrypt; 
void PASInitialize() {
char *            pMutexSemName;
DWORD     NTRC;
pMutexSemName = gsemCrypt;
oslRc = MutexSemCreate((char*)NULL,&gsemCrypt));   //Mutex creation by calling CreateMutex() function
oslRc = MutexSemRequest( gsemCrypt, SEM_WAIT_FOREEVER); //Request the semaphore by calling WaitForSingleObject() function -infinite //timeout
// some operation
oslRC = MutexSemRelease( gsemCrypt ));  // release the mutex by calling ReleaseMutex function
void PASTerminate(){
oslRC = MutexSemClose(gsemCrypt); //calling Closehandle()function to close the mutex
WSACleanup();
From the dump files, it was noticed that the hang happens at the call MutexSemClose(..) function which in turn calls windows function Closehandle().