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cpython/Objects/mimalloc/prim/readme.md
Dino Viehland 05f2f0ac92
gh-90815: Add mimalloc memory allocator (#109914) 
* Add mimalloc v2.12

Modified src/alloc.c to remove include of alloc-override.c and not
compile new handler.

Did not include the following files:

 - include/mimalloc-new-delete.h
 - include/mimalloc-override.h
 - src/alloc-override-osx.c
 - src/alloc-override.c
 - src/static.c
 - src/region.c

mimalloc is thread safe and shares a single heap across all runtimes,
therefore finalization and getting global allocated blocks across all
runtimes is different.

* mimalloc: minimal changes for use in Python:

 - remove debug spam for freeing large allocations
 - use same bytes (0xDD) for freed allocations in CPython and mimalloc
   This is important for the test_capi debug memory tests

* Don't export mimalloc symbol in libpython.
* Enable mimalloc as Python allocator option.
* Add mimalloc MIT license.
* Log mimalloc in Lib/test/pythoninfo.py.
* Document new mimalloc support.
* Use macro defs for exports as done in:
  https://github.com/python/cpython/pull/31164/

Co-authored-by: Sam Gross <colesbury@gmail.com>
Co-authored-by: Christian Heimes <christian@python.org>
Co-authored-by: Victor Stinner <vstinner@python.org>
2023-10-30 15:43:11 +00:00

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Portability Primitives

This is the portability layer where all primitives needed from the OS are defined.

  • include/mimalloc/prim.h: primitive portability API definition.
  • prim.c: Selects one of unix/prim.c, wasi/prim.c, or windows/prim.c depending on the host platform (and on macOS, osx/prim.c defers to unix/prim.c).

Note: still work in progress, there may still be places in the sources that still depend on OS ifdef's.