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Add descriptions about signal queue.

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This commit is contained in:
David Xu 2005-11-11 05:40:39 +00:00
parent c05e95d4ff
commit a0e82eba5d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=152295
1 changed files with 24 additions and 0 deletions
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24
lib/libc/sys/sigwait.2
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@ -58,6 +58,24 @@ The signals specified by
.Fa set .Fa set
should be blocked at the time of the call to should be blocked at the time of the call to
.Fn sigwait . .Fn sigwait .
.Pp
If more than one thread is using
.Fn sigwait
to wait for the same signal, no more than one of these threads will return from
.Fn sigwait
with the signal number. If more than a single thread is blocked in
.Fn sigwait
for a signal when that signal is generated for the process, it is unspecified
which of the waiting threads returns from
.Fn sigwait .
If the signal is generated for a specific thread, as by
.Fn pthread_kill ,
only that thread will return.
.Pp
Should any of the multiple pending signals in the range SIGRTMIN to SIGRTMAX be
selected, it will be the lowest numbered one. The selection order between realtime
and non-realtime signals, or between multiple pending non-realtime signals,
is unspecified.
.Sh RETURN VALUES .Sh RETURN VALUES
If successful, If successful,
.Fn sigwait .Fn sigwait
@ -75,8 +93,14 @@ The
.Fa set .Fa set
argument argument
specifies one or more invalid signal numbers. specifies one or more invalid signal numbers.
.It Bq Er EFAULT
Any arguments point outside the allocated address space or there is a
memory protection fault.
.El .El
.Sh SEE ALSO .Sh SEE ALSO
.Xr sigtimedwait 2 ,
.Xr sigwaitinfo 2 ,
.Xr sigqueue 2 ,
.Xr sigaction 2 , .Xr sigaction 2 ,
.Xr sigpending 2 , .Xr sigpending 2 ,
.Xr sigsuspend 2 , .Xr sigsuspend 2 ,