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Add warning about deadlocks created by use of wakeup_one.

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Greg Lehey 2007-02-27 02:51:41 +00:00
parent 6a5964d385
commit 5af924bf6c
1 changed files with 6 additions and 0 deletions
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6
share/man/man9/sleep.9
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@ -97,6 +97,12 @@ when a large number of threads are sleeping on the same address,
but only one of them can actually do any useful work when made
runnable.
.Pp
.Fn wakeup_one
does not work reliably if more than one process is sleeping on the same address;
in this case it is possible for an unrelated process to be woken.
This process will ignore the wakeup, and the correct process will never be
woken.
.Pp
The
.Fn msleep
function is the general sleep call.