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musl - an implementation of the standard library for Linux-based systems
b17fbd3520
aarch64 provides ll/sc variants with acquire/release memory order, freeing us from the need to have full barriers both before and after the ll/sc operation. previously they were not used because the a_cas can fail without performing a_sc, in which case half of the barrier would be omitted. instead, define a custom version of a_cas for aarch64 which uses a_barrier explicitly when aborting the cas operation. aside from cas, other operations built on top of ll/sc are not affected since they never abort but rather loop until they succeed. a split ll/sc version of the pointer-sized a_cas_p is also introduced using the same technique. patch by Szabolcs Nagy. |
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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/