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Rich Felker fffc5cda10 fix false ownership of mutexes due to tid reuse, using robust list 
per the resolution of Austin Group issue 755, the POSIX requirement
that ownership be enforced for recursive and error-checking mutexes
does not allow a random new thread to acquire ownership of an orphaned
mutex just because it happened to be assigned the same tid as the
original owner that exited with the mutex locked.

one possible fix for this issue would be to disallow the kernel thread
to terminate when it exited with mutexes held, permanently reserving
the tid against reuse. however, this does not solve the problem for
process-shared mutexes where lifetime cannot be controlled, so it was
not used.

the alternate approach I've taken is to reuse the robust mutex system
for non-robust recursive and error-checking mutexes. when a thread
exits, the kernel (or the new userspace robust-list code added in
commit b092f1c5fa) will set the
owner-died bit for these orphaned mutexes, but since the mutex-type is
not robust, pthread_mutex_trylock will not allow a new owner to
acquire them. instead, they remain in a state of being permanently
locked, as desired.
2014-08-16 19:15:19 -04:00
arch fix broken offset argument to the mmap2 syscall on or1k 2014-07-30 23:25:37 -04:00
crt add or1k (OpenRISC 1000) architecture port 2014-07-18 14:10:23 -04:00
dist add another example option to dist/config.mak 2012-04-24 16:49:11 -04:00
include fix CPU_EQUAL macro in sched.h 2014-08-13 16:55:56 +02:00
lib new solution for empty lib dir (old one had some problems) 2011-02-17 17:12:52 -05:00
src fix false ownership of mutexes due to tid reuse, using robust list 2014-08-16 19:15:19 -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 or1k (OpenRISC 1000) architecture port 2014-07-18 14:10:23 -04:00
COPYRIGHT update COPYRIGHT file to reflect new contributors 2014-07-31 16:06:11 -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 1.1.4 2014-07-31 19:10:31 -04:00
WHATSNEW release 1.1.4 2014-07-31 19:10:31 -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/