John Baldwin 4e7f640dfb Optimize sx locks to use simple atomic operations for the common cases of ... obtaining and releasing shared and exclusive locks. The algorithms for manipulating the lock cookie are very similar to that rwlocks. This patch also adds support for exclusive locks using the same algorithm as mutexes. A new sx_init_flags() function has been added so that optional flags can be specified to alter a given locks behavior. The flags include SX_DUPOK, SX_NOWITNESS, SX_NOPROFILE, and SX_QUITE which are all identical in nature to the similar flags for mutexes. Adaptive spinning on select locks may be enabled by enabling the ADAPTIVE_SX kernel option. Only locks initialized with the SX_ADAPTIVESPIN flag via sx_init_flags() will adaptively spin. The common cases for sx_slock(), sx_sunlock(), sx_xlock(), and sx_xunlock() are now performed inline in non-debug kernels. As a result, <sys/sx.h> now requires <sys/lock.h> to be included prior to <sys/sx.h>. The new kernel option SX_NOINLINE can be used to disable the aforementioned inlining in non-debug kernels. The size of struct sx has changed, so the kernel ABI is probably greatly disturbed. MFC after: 1 month Submitted by: attilio Tested by: kris, pjd		2007-03-31 23:23:42 +00:00
..
acpi_machdep.c	Optimize sx locks to use simple atomic operations for the common cases of	2007-03-31 23:23:42 +00:00
acpi_wakecode.S
acpi_wakeup.c	Create an identity mapping (V=P) super page for the low memory region on	2007-03-14 22:30:02 +00:00
genwakecode.sh
madt.c	Catch up with ACPI-CA 20070320 import.	2007-03-22 18:16:43 +00:00
Makefile
OsdEnvironment.c	Catch up with ACPI-CA 20070320 import.	2007-03-22 18:16:43 +00:00