🚀 go-pugleaf

"static array?" <nospam@nospam.com> wrote in message 
news:469cdda8@newsgroups.borland.com...
>I was having issues with my mutex handler - and have boiled it down 
>to this.
>
> What the heck is wrong with this. I expect to create a deadlock 
> here - but it doesnt happen!
>
> char * c = "ksfgkjsfdgkj\0";
>
> HANDLE MutexHandle1 = CreateMutex(NULL, FALSE, c);
> WaitForSingleObject(MutexHandle1, INFINITE);
>
> // ok so I have the mutex lock now
>
> // lets try to create (open) the same mutex.  (I note that the 
> handle
> // address returned is different for each call).
>
> HANDLE MutexHandle2 = CreateMutex(NULL, FALSE, c); // note exact 
> same name
> WaitForSingleObject(MutexHandle2, INFINITE);
>
> // I expect that last call to never return - but it does 
> immediately.
> // I also note that a call to GetLastError does indeed return 
> ALREADY_EXISTS.... so I am confused...
>
> What am I doing wrong here?

From the Windows SDK:
"The thread that owns a mutex can specify the same mutex in repeated 
wait function calls without blocking its execution. Typically, you 
would not wait repeatedly for the same mutex, but this mechanism 
prevents a thread from deadlocking itself while waiting for a mutex 
that it already owns. However, to release its ownership, the thread 
must call ReleaseMutex once for each time that the mutex satisfied a 
wait."



-- 

Bruce