System Memory Allocation Functions

The following functions are available to access RTX system memory allocation services:

RtAllocateLockedMemory allocates memory that is backed by physical memory and locked, then maps the memory into the virtual address space of the process.
RtFreeLockedMemory frees a previously allocated locked memory region.

RTSS and Win32 Programming Considerations

Locked memory is always allocated from a non-paged pool of memory that is maintained by Windows. This pool of memory is relatively small and is rapidly fragmented by the allocations of other drivers and subsystems in Windows shortly after system boot. To avoid failure of large allocations, you should minimize their use and/or ensure that they are accomplished shortly after system boot.

Programming Example (RTX Locked Memory Allocation Calls)

See the RTX Locked Memory Allocation Calls Programming Example in the RTX Example Reference. It demonstrates the use of RTX locked memory allocation calls.