KeAcquireGuardedMutexUnsafe - NtDoc
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// wdm.h
VOID KeAcquireGuardedMutexUnsafe(
PKGUARDED_MUTEX FastMutex
);
View the official Windows Driver Kit DDI referenceNo description available.
The KeAcquireGuardedMutexUnsafe acquires a guarded mutex while inside a guarded region.
FastMutex[in, out] Pointer to the KGUARDED_MUTEX structure for the guarded mutex.
Use KeReleaseGuardedMutexUnsafe to release a guarded mutex acquired with KeAcquireMutexUnsafe.
KeAcquireGuardedMutexUnsafe does not implicitly place the calling thread within a guarded region. Code enclosed within a KeAcquireGuardedMutexUnsafe/KeReleaseGuardedMutexUnsafe pair must execute either at IRQL = APC_LEVEL, or within a guarded region. For code that is not guaranteed to execute within a guarded region, use KeAcquireGuardedMutex and KeReleaseGuardedMutexUnsafe.
A guarded mutex cannot be acquired recursively: if a thread is already holding the mutex when it calls KeAcquireGuardedMutexUnsafe, the thread will deadlock.
For more information about guarded mutexes, see Fast Mutexes and Guarded Mutexes.