| | 1 | .\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>. |
| | 2 | .\" All rights reserved. |
| | 3 | .\" |
| | 4 | .\" Redistribution and use in source and binary forms, with or without |
| | 5 | .\" modification, are permitted provided that the following conditions |
| | 6 | .\" are met: |
| | 7 | .\" 1. Redistributions of source code must retain the above copyright |
| | 8 | .\" notice(s), this list of conditions and the following disclaimer as |
| | 9 | .\" the first lines of this file unmodified other than the possible |
| | 10 | .\" addition of one or more copyright notices. |
| | 11 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 12 | .\" notice(s), this list of conditions and the following disclaimer in |
| | 13 | .\" the documentation and/or other materials provided with the |
| | 14 | .\" distribution. |
| | 15 | .\" |
| | 16 | .\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY |
| | 17 | .\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 18 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| | 19 | .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE |
| | 20 | .\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| | 21 | .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| | 22 | .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| | 23 | .\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| | 24 | .\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| | 25 | .\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
| | 26 | .\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| | 27 | .\" |
| | 28 | .\" $FreeBSD: src/lib/libc_r/man/sem_post.3,v 1.1.2.8 2001/12/17 10:08:26 ru Exp $ |
| | 29 | .Dd April 15, 2009 |
| | 30 | .Dt SEM_POST 3 |
| | 31 | .Os |
| | 32 | .Sh NAME |
| | 33 | .Nm sem_post |
| | 34 | .Nd increment (unlock) a semaphore |
| | 35 | .Sh LIBRARY |
| | 36 | .Lb libpthread |
| | 37 | .Sh SYNOPSIS |
| | 38 | .In semaphore.h |
| | 39 | .Ft int |
| | 40 | .Fn sem_post "sem_t *sem" |
| | 41 | .Sh DESCRIPTION |
| | 42 | The |
| | 43 | .Fn sem_post |
| | 44 | function increments (unlocks) the semaphore pointed to by |
| | 45 | .Fa sem . |
| | 46 | If there are threads blocked on the semaphore when |
| | 47 | .Fn sem_post |
| | 48 | is called, then the highest priority thread that has been blocked the longest on |
| | 49 | the semaphore will be allowed to return from |
| | 50 | .Fn sem_wait . |
| | 51 | .Pp |
| | 52 | .Fn sem_post |
| | 53 | is signal-reentrant and may be called within signal handlers. |
| | 54 | .Sh RETURN VALUES |
| | 55 | .Rv -std sem_post |
| | 56 | .Sh ERRORS |
| | 57 | .Fn sem_post |
| | 58 | will fail if: |
| | 59 | .Bl -tag -width Er |
| | 60 | .It Bq Er EINVAL |
| | 61 | .Fa sem |
| | 62 | points to an invalid semaphore. |
| | 63 | .El |
| | 64 | .Sh SEE ALSO |
| | 65 | .Xr sem_trywait 3 , |
| | 66 | .Xr sem_wait 3 |
| | 67 | .Sh STANDARDS |
| | 68 | .Fn sem_post |
| | 69 | conforms to |
| | 70 | .St -p1003.1-96 . |
projects / dragonfly.git / blame_incremental