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added nimAllocPagesViaMalloc switch (#18490)

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* added  switch

* alloc.nim needs page aligned memory blocks
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Andreas Rumpf 2021-07-15 17:58:47 +02:00 • committed by GitHub
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5 changed files with 46 additions and 7 deletions
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14
doc/nimc.rst
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@ -176,7 +176,7 @@ directories (in this order; later files overwrite previous settings):
``%APPDATA%/nim/nim.cfg`` (Windows).
This file can be skipped with the `--skipUserCfg`:option: command line
option.
3) ``$parentDir/nim.cfg`` where ``$parentDir`` stands for any parent
3) ``$parentDir/nim.cfg`` where ``$parentDir`` stands for any parent
directory of the project file's path.
These files can be skipped with the `--skipParentCfg`:option:
command-line option.
@ -634,6 +634,18 @@ optimization in the compiler and linker.
Check the `Cross-compilation`_ section for instructions on how to compile the
program for your target.
nimAllocPagesViaMalloc
----------------------
Nim's default allocator is based on TLSF, this algorithm was designed for embedded
devices. This allocator gets blocks/pages of memory via a currently undocumented
`osalloc` API which usually uses POSIX's `mmap` call. On many environments `mmap`
is not available but C's `malloc` is. You can use the `nimAllocPagesViaMalloc`
define to use `malloc` instead of `mmap`. `nimAllocPagesViaMalloc` is currently
only supported with `--gc:arc` or `--gc:orc`. (Since version 1.6)
Nim for realtime systems
========================