Richard Cochran 1791f88143 posix clocks: Replace mutex with reader/writer semaphore ... A dynamic posix clock is protected from asynchronous removal by a mutex. However, using a mutex has the unwanted effect that a long running clock operation in one process will unnecessarily block other processes. For example, one process might call read() to get an external time stamp coming in at one pulse per second. A second process calling clock_gettime would have to wait for almost a whole second. This patch fixes the issue by using a reader/writer semaphore instead of a mutex. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Cc: John Stultz <john.stultz@linaro.org> Link: http://lkml.kernel.org/r/%3C20110330132421.GA31771%40riccoc20.at.omicron.at%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2011-04-18 10:39:38 +02:00
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clockevents.c
clocksource.c
jiffies.c
Kconfig
Makefile
ntp.c	ntp: fix non privileged system time shifting	2011-04-04 08:31:23 -07:00
posix-clock.c	posix clocks: Replace mutex with reader/writer semaphore	2011-04-18 10:39:38 +02:00
tick-broadcast.c
tick-common.c
tick-internal.h
tick-oneshot.c
tick-sched.c
timecompare.c
timeconv.c
timekeeping.c
timer_list.c
timer_stats.c