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musl - an implementation of the standard library for Linux-based systems
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f08ab9e61a
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Rich Felker f08ab9e61a redesign and simplify vmlock system 
this global lock allows certain unlock-type primitives to exclude
mmap/munmap operations which could change the identity of virtual
addresses while references to them still exist.

the original design mistakenly assumed mmap/munmap would conversely
need to exclude the same operations which exclude mmap/munmap, so the
vmlock was implemented as a sort of 'symmetric recursive rwlock'. this
turned out to be unnecessary.

commit 25d12fc0fc already shortened the
interval during which mmap/munmap held their side of the lock, but
left the inappropriate lock design and some inefficiency.

the new design uses a separate function, __vm_wait, which does not
hold any lock itself and only waits for lock users which were already
present when it was called to release the lock. this is sufficient
because of the way operations that need to be excluded are sequenced:
the "unlock-type" operations using the vmlock need only block
mmap/munmap operations that are precipitated by (and thus sequenced
after) the atomic-unlock they perform while holding the vmlock.

this allows for a spectacular lack of synchronization in the __vm_wait
function itself.
2015-04-10 02:27:52 -04:00
arch fix possible clobbering of syscall return values on mips 2015-04-07 12:47:19 -04:00
crt add aarch64 port 2015-03-11 20:12:35 -04:00
dist add another example option to dist/config.mak 2012-04-24 16:49:11 -04:00
include remove macro definition of longjmp from setjmp.h 2015-04-01 20:35:03 -04:00
lib new solution for empty lib dir (old one had some problems) 2011-02-17 17:12:52 -05:00
src redesign and simplify vmlock system 2015-04-10 02:27:52 -04:00
tools fix system breakage window during make install due to permissions 2014-01-15 22:29:13 -05:00
.gitignore add version.h to .gitignore; it is a generated file 2014-01-21 01:06:42 -05:00
configure add aarch64 port 2015-03-11 20:12:35 -04:00
COPYRIGHT update authors/contributors list 2015-03-16 18:43:54 -04:00
INSTALL update notice on broken gcc versions in INSTALL file 2014-07-31 19:02:54 -04:00
Makefile add tarball-producing targets to Makefile for ease of release 2014-06-25 16:14:37 -04:00
README update version reference in the README file 2014-06-25 14:16:53 -04:00
VERSION release 1.1.8 2015-03-29 23:48:12 -04:00
WHATSNEW release 1.1.8 2015-03-29 23:48:12 -04:00

README 

    musl libc

musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.

The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.

For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:

    http://www.musl-libc.org/