ID Number: Q72584
3.00
WINDOWS
buglist3.00 fixlist3.10
SYMPTOMS
When an application running under Microsoft Windows version 3.0
allocates a block of memory with the GMEM_FIXED attribute
specified, Windows returns the handle to a block of page-locked
memory. Depending on the amount of available memory, the system may
hang or slow down because of disk thrashing.
CAUSE
The Windows kernel page locks all fixed memory allocated in Windows
version 3.0. When a memory block is page locked, Windows cannot
page to disk the physical memory associated with the segment.
This behavior is incorrect for applications; however, it is correct
for dynamic-link libraries (DLLs). If a DLL allocates GMEM_FIXED
memory, Windows provides page-locked memory because Windows assumes
that the DLL might access the memory at interrupt time.
STATUS
Microsoft has confirmed this to be a problem in Windows version
3.0. This problem was corrected in Windows version 3.1.
Additional reference words: 3.00