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author | mtm <mtm@FreeBSD.org> | 2004-02-19 13:51:52 +0000 |
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committer | mtm <mtm@FreeBSD.org> | 2004-02-19 13:51:52 +0000 |
commit | 92fa0888006446f19ecb94917fc328f73a181ca5 (patch) | |
tree | cad0329c8633c156cb26fae5e88c67ab7c100c11 /share/man/man3/pthread_barrier_destroy.3 | |
parent | 88ba2a7fa4a4e9ece2211b64fa3b51b55672dc6d (diff) | |
download | FreeBSD-src-92fa0888006446f19ecb94917fc328f73a181ca5.zip FreeBSD-src-92fa0888006446f19ecb94917fc328f73a181ca5.tar.gz |
Implement PThreads barriers and barrier attributes.
Diffstat (limited to 'share/man/man3/pthread_barrier_destroy.3')
-rw-r--r-- | share/man/man3/pthread_barrier_destroy.3 | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/share/man/man3/pthread_barrier_destroy.3 b/share/man/man3/pthread_barrier_destroy.3 new file mode 100644 index 0000000..27ded5b --- /dev/null +++ b/share/man/man3/pthread_barrier_destroy.3 @@ -0,0 +1,157 @@ +.\" Copyright (c) 2004 Michael Telahun Makonnen +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.\" Note: The date here should be updated whenever a non-trivial +.\" change is made to the manual page. +.Dd February 19, 2004 +.Dt PTHREAD_BARRIER_DESTROY 3 PTHREAD_BARRIER_INIT 3 PTHREAD_BARRIER_WAIT 3 +.Os +.Sh NAME +.Nm pthread_barrier_destroy pthread_barrier_init pthread_barrier_wait +.Nd "destroy, initialize or wait on a barrier object" +.Sh LIBRARY +.Lb libpthread +.Lb libthr +.Sh SYNOPSIS +.In pthread.h +.Ft int +.Fn pthread_barrier_destroy "pthread_barrier_t *barrier" +.Ft int +.Fn pthread_barrier_init "pthread_barrier_t *barrier" "const pthread_barrierattr_t *attr" "int count" +.Ft int +.Fn pthread_barrier_wait "pthread_barrier_t *barrier" +.Sh DESCRIPTION +The +.Fn pthread_barrier_init +function will initialize +.Fa barrier +with attributes specified in +.Fa attr , +or if it is NULL, +with default attributes. +The number of threads that must call +.Fn pthread_barrier_wait +before any of the waiting threads can be +released is specified by +.Fa count . +The +.Fn pthread_barrier_destroy +function will destroy +.Fa barrier +and release any resources that may have been allocated on its behalf. +.Pp +The +.Fn pthread_barrier_wait +function will synchronize calling threads at +.Fa barrier . +The threads will be blocked from +making further progress until +a sufficient number of threads calls this function. +The number of threads that must call it before +any of them will be released is determined by the +.Fa count +argument to +.Fn pthread_barrier_init . +Once the threads have been released the barrier will be reset. +.Sh DIAGNOSTICS +If successful, +both +.Fn pthread_barrier_destroy +and +.Fn pthread_barrier_init +will return zero. +Otherwise an error number will be returned to indicate the error. +If the call to +.Fn pthread_barrier_wait +is successful all but one of the threads will return zero. +That one thread will return PTHREAD_BARRIER_SERIAL_THREAD. +Otherwise an error number will be returned to indicate the error. +.Pp +None of these functions will return EINTR. +.Sh IMPLIMENTATION NOTES +In both +.Lb libpthread +and +.Lb libthr +the PTHREAD_BARRIER_SERIAL_THREAD return value will +always be returned by the last thread to reach the barrier. +.Sh ERRORS +The +.Fn pthread_barrier_destroy +function will fail if: +.Bl -tag -width Er +.It Bq Er EBUSY +An attempt was made to destroy +.Fa barrier +while it was in use. +.El +.Pp +The +.Fn pthread_barrier_destroy +and +.Fn pthread_barrier_wait +functions may fail if: +.Bl -tag -width Er +.It Bq Er EINVAL +The value specified by +.Fa barrier +is invalid. +.El +.Pp +The +.Fn pthread_barrier_init +function will fail if: +.Bl -tag -width Er +.It Bq Er EAGAIN +The system lacks resources, +other than memory, +to initialize +.Fa barrier . +.It Bq Er EINVAL +The +.Fa count +argument is less than 1. +.It Bq Er ENOMEM +Insufficient memory to initialize +.Fa barrier . +.El +.Sh SEE ALSO +.Xr pthread_barrier_wait 3 , +.Xr pthread_barrierattr 3 +.Sh HISTORY +The +.Fn pthread_barrier_destroy , +.Fn pthread_barrier_init +and +.Fn pthread_barrier_wait +functions first appeared in +.Lb libpthread +in +.Fx 5.2 , +and in +.Lb libthr +in +.Fx 5.3 . |