cvs commit: src/share/man/man9 Makefile timeout.9 src/sys/sys
callout.h src/sys/kern kern_timeout.c
iedowse at FreeBSD.org
Sun Feb 6 18:47:34 PST 2005
iedowse 2005-02-07 02:47:33 UTC
FreeBSD src repository
share/man/man9 Makefile timeout.9
Add a mechanism for associating a mutex with a callout when the
callout is first initialised, using a new function callout_init_mtx().
The callout system will acquire this mutex before calling the callout
function and release it on return.
In addition, the callout system uses the mutex to avoid most of the
complications and race conditions inherent in asynchronous timer
facilities, so mutex-protected callouts have much simpler semantics.
As long as the mutex is held when invoking callout_stop() or
callout_reset(), then these functions will guarantee that the callout
will be stopped, even if softclock() had already begun to process
Existing Giant-locked callouts will automatically pick up the new
race-free semantics. This should close a number of race conditions
in the USB code and probably other areas of the kernel too.
There should be no change in behaviour for "MP-safe" callouts; these
still need to use the techniques mentioned in timeout(9) to avoid
Revision Changes Path
1.253 +6 -1 src/share/man/man9/Makefile
1.27 +50 -1 src/share/man/man9/timeout.9
1.96 +106 -15 src/sys/kern/kern_timeout.c
1.28 +5 -0 src/sys/sys/callout.h
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