IMallocSpy::PreAlloc
Called just prior to invoking
IMalloc::Alloc.
ULONG PreAlloc(
ULONG cbRequest
| //The byte count passed to IMalloc::Alloc
|
);
|
|
Parameter
cbRequest
The number of bytes in the allocation request the caller is passing to
IMalloc::Alloc.
Return Value
The byte count actually passed to
IMalloc::Alloc, which should be greater than or equal to the value of
cbRequest.
Comments
The
IMallocSpy::PreAlloc implementation may extend and/or modify the allocation to store
debug-specific information with the allocation.
PreAlloc can force memory allocation failure by returning 0, allowing testing to
ensure that the application handles allocation failure gracefully in all cases. In
this case
PostAlloc is not called and
Alloc returns NULL. Forcing allocation failure is effective only if
cbRequest is not equal to 0. If
PreAlloc is forcing failure by returning NULL,
PostAlloc is not called. However, if
IMalloc::Alloc encounters a real memory failure and returns NULL,
PostAlloc is called.
The call to
PreAlloc through the return from
PostAlloc is guaranteed to be thread safe.
See Also
IMalloc::Alloc,
IMallocSpy::PostAlloc,
CoRegisterMallocSpy,
CoRevokeMallocSpy
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