ExInitializeFastMutex - NtDoc
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headers
// wdm.h
VOID ExInitializeFastMutex(
[out] PFAST_MUTEX FastMutex
);
View the official Windows Driver Kit DDI referenceNo description available.
The ExInitializeFastMutex routine initializes a fast mutex variable, used to synchronize mutually exclusive access by a set of threads to a shared resource.
FastMutex [out]A pointer to a caller-allocated FAST_MUTEX structure, which represents the fast mutex, in the nonpaged memory pool. The allocation must be 4-byte aligned on 32-bit platforms, and 8-byte aligned on 64-bit platforms.
ExInitializeFastMutex must be called before any calls to other ExXxxFastMutex routines occur.
Although the caller supplies the storage for the given fast mutex, the FAST_MUTEX structure is opaque: that is, its members are reserved for system use.
For better performance, use the ExXxxFastMutex routines instead of the KeXxxMutex routines. However, a fast mutex cannot be acquired recursively, as a kernel mutex can.
For more information about fast mutexes, see Fast Mutexes and Guarded Mutexes.