How to allocate memory from a specific region

Question

Usually, the functions mallocand freecan be used to allocate memory in accordance with the implementation. However, it is often necessary to manage the allocation of memory from a particular region. Examples include:

• Shared memory between processes
• Memory mapped files
• Non-volatile memory

Instead of writing a one-time implementation of the heap every time this requirement arises, is there a way to reuse it mallocto manage these regions (Linux)? Otherwise, can any of the “known” memory allocators (for example, dmalloc, ptmalloc, etc.) support allocation from a specific area?

Example:

void *pool = mmap(/* my file */);
void *pool_manager = mallloc_init(pool, /* size */);
void *p = malloc_ex(pool, 1024);
free_ex(pool, p);

Answer 1

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