diff options
author | mtm <mtm@FreeBSD.org> | 2004-01-22 15:31:56 +0000 |
---|---|---|
committer | mtm <mtm@FreeBSD.org> | 2004-01-22 15:31:56 +0000 |
commit | 7a517ec35f80fe08da85e81fe1aa41bf8d798ab2 (patch) | |
tree | 34fdcb089696e32bfb3291aa3b79f29eec73eb4c /share/man/man3/pthread_spin_lock.3 | |
parent | 9e559fd52a0ce5de58459528736b0991ca0ba181 (diff) | |
download | FreeBSD-src-7a517ec35f80fe08da85e81fe1aa41bf8d798ab2.zip FreeBSD-src-7a517ec35f80fe08da85e81fe1aa41bf8d798ab2.tar.gz |
o Implement the pthread_spin_* functions in libthr.
o Man pages
Diffstat (limited to 'share/man/man3/pthread_spin_lock.3')
-rw-r--r-- | share/man/man3/pthread_spin_lock.3 | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/share/man/man3/pthread_spin_lock.3 b/share/man/man3/pthread_spin_lock.3 new file mode 100644 index 0000000..0dc4490 --- /dev/null +++ b/share/man/man3/pthread_spin_lock.3 @@ -0,0 +1,141 @@ +.\" 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 January 22, 2004 +.Dt PTHREAD_SPIN_LOCK 3 PTHREAD_SPIN_TRYLOCK 3 PTHREAD_SPIN_UNLOCK 3 +.Os +.Sh NAME +.Nm pthread_spin_lock pthread_spin_trylock pthread_spin_unlock +.Nd "lock or unlock a spin lock" +.Sh LIBRARY +.Lb libpthread +.Lb libthr +.Sh SYNOPSIS +.In pthread.h +.Ft int +.Fn pthread_spin_lock "pthread_spinlock_t *lock" +.Ft int +.Fn pthread_spin_trylock "pthread_spinlock_t *lock" +.Ft int +.Fn pthread_spin_unlock "pthread_spinlock_t *lock" +.Sh DESCRIPTION +The +.Fn pthread_spin_lock +function will acquire +.Fa lock +if it is not currently owned by another thread. +If the lock cannot be acquired immediately it will +spin attempting to acquire the lock (it will not sleep) until +it becomes available. +.Pp +The +.Fn pthread_spin_trylock +function is the same as +.Fn pthread_spin_lock +except that if it cannot acquire +.Fa lock +immediately it will return with an error. +.Pp +The +.Fn pthread_spin_unlock +function will release +.Fa lock , +which must have been previously locked by a call to +.Fn pthread_spin_lock +or +.Fn pthread_spin_trylock . +.Sh DIAGNOSTICS +If successful all these functions will return zero. +Otherwise an error number will be returned to indicate the error. +.Pp +None of these functions will return EINTR. +.Pp +.Sh ERRORS +The +.Fn pthread_spin_lock , +.Fn pthread_spin_trylock +and +.Fn pthread_spin_unlock +functions will fail if: +.Bl -tag -width Er +.It Bq Er EINVAL +The value specified by +.Fa lock +is invalid or is not initialized. +.El +.Pp +The +.Fn pthread_spin_lock +function may fail if: +.Bl -tag -width Er +.It Bq Er EDEADLK +The calling thread already owns the lock. +.El +.Pp +The +.Fn pthread_spin_trylock +function will fail if: +.Bl -tag -width Er +.It Bq Er EBUSY +Another thread currently holds +.Fa lock . +.El +.Pp +The +.Fn pthread_spin_unlock +function may fail if: +.Bl -tag -width Er +.It Bq Er EPERM +The calling thread does not own +.Fa lock . +.El +.Sh SEE ALSO +.Xr pthread_spin_init 3 , +.Xr pthread_spin_destroy 3 +.Sh HISTORY +The +.Fn pthread_spin_lock , +.Fn pthread_spin_trylock +and +.Fn pthread_spin_unlock +functions first appeared in +.Lb libpthread +in +.Fx 5.2 , +and in +.Lb libthr +in +.Fx 5.3 . +.Sh BUGS +The implementation of +.Fn pthread_spin_lock , +.Fn pthread_spin_trylock +and +.Fn pthread_spin_unlock +is expected to conform to +.St -p1003.2 . |