Summary: When you run an application using a debugger under Windows NT 3.51, some heap-checking flags used by the operating system are changed. One of them prevents the heap from coalescing free blocks. This results in your application committing more memory than it is actually using, which causes a low memory condition to occur.
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Manual SolutionsThese flags only exist in Windows NT 3.51; this is not an issue in earlier versions of Windows NT or in Windows 95. It also is not an issue if you have Service Pack 2 or Service Pack 3 installed for Windows NT 3.51.
To avoid the heap behavior, change the heap flags for your application. To do this open the registry editor (Regedt32.exe) and create the following key: HKEY_LOCAL_MACHINE Software Microsoft Windows NT Current Version Image File Execution Options myapp.exe
Where 'myapp.exe' is the name of your application's .exe file.
For a retail system, create the value: GlobalFlag = REG_SZ 0x70
For a checked system, create the value: GlobalFlag = REG_SZ 0x4f4470
GlobalFlag is a bitmask; here are the heap-related bits: FLG_HEAP_ENABLE_TAIL_CHECK 0x00000010 FLG_HEAP_ENABLE_FREE_CHECK 0x00000020 FLG_HEAP_VALIDATE_PARAMETERS 0x00000040 FLG_HEAP_VALIDATE_ALL 0x00000080
VALIDATE_ALL is the flag that disables coalescing blocks.
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