转储关键节队列（线程正在等待）

Question

I have an issue (crash dump) where my Critical Section is being destroyed but after inspecting the LockCount I note that there is 1 thread waiting on it (it seems that the thread has been woken, but not yet entered, since lock status is Not Locked).

I want to see what thread has been woken. I know the Critical Section has a queue of waiting threads, if I could dump this queue/list structure I should be able to answer my question, any idea's on what I could do?

Answer 1

the CriticalSection Object is defined as

typedef RTL_CRITICAL_SECTION CRITICAL_SECTION;

with RTL_CRITICAL_SECTION defined as

typedef struct _RTL_CRITICAL_SECTION {
    PRTL_CRITICAL_SECTION_DEBUG DebugInfo;
    LONG LockCount;
    LONG RecursionCount;
    HANDLE OwningThread;        // from the thread's ClientId->UniqueThread
    HANDLE LockSemaphore;
    ULONG_PTR SpinCount;        // force size on 64-bit systems when packed
} RTL_CRITICAL_SECTION, *PRTL_CRITICAL_SECTION;

OwningThread will contain a handle to the owning thread. So you may just read the CriticalSection data structure to obtain the handle to the owning thread.

DWORD WINAPI GetThreadId(_In_ HANDLE OwningThread);

will return the ID of the owning thread.

However, there is a small mishap with the definition of OwningThread. MSDN reports that field actually contains the thread ID itself.

You may use

GetThreadInformation(OwningThread,....);

to obtain more thread details.

Break Free of Code Deadlocks in Critical Sections Under Windows on MSDN is a must read in this context. Particulary the EntryCount/ContentionCount field in the RTL_CRITICAL_SECTION_DEBUG structure may give an answer to the question here.

Answer 2

Have you tried !locks? There's info about viewing critical sections in a process in the WinDBG docs here:

http://msdn.microsoft.com/en-us/library/windows/hardware/ff541979(v=vs.85).aspx