KeReadStateMutex function (wdm.h)
The KeReadStateMutex routine returns the current state, signaled or not-signaled, of the specified mutex object.
C++
LONG KeReadStateMutex(
[in] PRKMUTEX Mutex
);
[in] Mutex
Pointer to an initialized mutex object for which the caller provides the storage.
If the return value is 1, the state of the mutex object is signaled.
This routine provides an efficient way to poll the signal state of a mutex. KeReadStateMutex reads the state of the mutex without synchronizing its access to the mutex. Do not assume that accesses of a mutex state by KeReadStateMutex are mutually exclusive of accesses by routines, such as KeReleaseMutex and KeWaitForSingleObject, that do synchronize their access to the mutex state.
For more information about mutex objects, see Mutex Objects.
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| Target Platform | Universal |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= DISPATCH_LEVEL |
| DDI compliance rules | HwStorPortProhibitedDDIs(storport) |