function attempts to compact a specified heap. It compacts the heap by
coalescing adjacent free blocks of memory and decommitting large free blocks of
| HANDLE hHeap,
||// handle to the heap to compact
| DWORD dwFlags
||// bit-flags that control heap access during function operation
Handle to the heap that the function will attempt to compact.
A set of bit flags that control heap access during function operation. The
following bit flag has meaning:
||If this flag is set, heap access is not serialized while the HeapCompact function accesses the heap; heap access is not mutually exclusive. It is safe
to set this flag only in a limited set of specific situations. For a discussion
of those situations and heap serialization in general, see the Remarks section
If this flag is clear, heap access is serialized while HeapCompact accesses the heap; heap access is mutually exclusive. This is the safe and
simple default condition.
If the function succeeds, the return value is the size, in bytes, of the
largest committed free block in the heap. This is an unsigned integer value.
If the function fails, the return value is zero. To get extended error
information, call GetLastError
In the unlikely case that there is absolutely no space available in the heap,
the function return value is zero, and GetLastError
returns the value NO_ERROR.
There is no guarantee that an application can successfully allocate a memory
block of the size returned by HeapCompact
. Other threads or the commit threshold might prevent such an allocation.
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