Artis Caune wrote:
Hello FreeBSD-hackers!
what is the right way to stop callout which is initialized with mutex:
callout_init_mtx(&callout_function, &my_mtx, 0);
should I lock mutex before calling callout_drain() or not?
man page says: callout_drain() is identical to callout_stop() and
if the callout has an associated mutex, then that mutex must be held
when callout_stop() is called.
/* MOD_UNLOAD */
MTX_LOCK;
callout_drain()
MTX_UNLOCK;
If you use callout_init_mtx then use callout_stop while holding my_mtx;
if the callout is blocked waiting for my_mtx the request will be discarded.
callout_drain should not be called while holding my_mtx because it can
sleep.
Sam
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