Rich Felker b17fbd3520 improve aarch64 atomics ... 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.		2016-01-23 14:03:40 -05:00
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aarch64	improve aarch64 atomics	2016-01-23 14:03:40 -05:00
arm	move arm-specific translation units out of arch/arm/src, to src/*/arm	2016-01-22 00:02:21 +00:00
i386	clean up i386 atomics for new atomics framework	2016-01-22 00:16:53 +00:00
microblaze	refactor internal atomic.h	2016-01-21 19:08:54 +00:00
mips	overhaul mips atomics for new atomics framework	2016-01-22 00:10:40 +00:00
or1k	refactor internal atomic.h	2016-01-21 19:08:54 +00:00
powerpc	overhaul powerpc atomics for new atomics framework	2016-01-22 02:58:32 +00:00
sh	remove sh port's __fpscr_values source file	2016-01-22 03:50:58 +00:00
x32	move x32 sysinfo impl and syscall fixup code out of arch/x32/src	2016-01-22 03:39:07 +00:00
x86_64	clean up x86_64 (and x32) atomics for new atomics framework	2016-01-22 00:53:09 +00:00