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Annotation of src/lib/librt/sem_post.3, Revision 1.3

1.3     ! wiz         1: .\" $NetBSD: sem_post.3,v 1.2 2012/03/08 21:59:29 joerg Exp $
1.1       thorpej     2: .\"
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1.2       joerg      30: .Dd February 29, 2012
1.1       thorpej    31: .Dt SEM_POST 3
                     32: .Os
                     33: .Sh NAME
                     34: .Nm sem_post
                     35: .Nd increment (unlock) a semaphore
                     36: .Sh LIBRARY
                     37: .Lb librt
                     38: .Sh SYNOPSIS
                     39: .In semaphore.h
                     40: .Ft int
                     41: .Fn sem_post "sem_t *sem"
                     42: .Sh DESCRIPTION
                     43: The
                     44: .Fn sem_post
                     45: function increments (unlocks) the semaphore pointed to by
                     46: .Fa sem .
                     47: If there are threads blocked on the semaphore when
                     48: .Fn sem_post
                     49: is called, then the highest priority thread that has been blocked the longest on
                     50: the semaphore will be allowed to return from
1.3     ! wiz        51: .Fn sem_wait
1.2       joerg      52: or
1.3     ! wiz        53: .Fn sem_timedwait .
1.1       thorpej    54: .Pp
                     55: .Fn sem_post
                     56: is signal-reentrant and may be called within signal handlers.
                     57: .Sh RETURN VALUES
                     58: .Rv -std sem_post
                     59: .Sh ERRORS
                     60: .Fn sem_post
                     61: will fail if:
                     62: .Bl -tag -width Er
                     63: .It Bq Er EINVAL
                     64: .Fa sem
                     65: points to an invalid semaphore.
                     66: .El
                     67: .Sh SEE ALSO
1.2       joerg      68: .Xr sem_timedwait 3 ,
1.1       thorpej    69: .Xr sem_trywait 3 ,
                     70: .Xr sem_wait 3
                     71: .Sh STANDARDS
                     72: .Fn sem_post
                     73: conforms to
                     74: .St -p1003.1-96 .