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.sh see also |
.br getmntent (3), |
.br fstab (5) |
.sh colophon |
this page is part of release 5.13 of the linux |
.i man-pages |
project. |
a description of the project, |
information about reporting bugs, |
and the latest version of this page, |
can be found at |
\%https://www.kernel.org/doc/man\-pages/. |
.so man3/ctime.3 |
.\" copyright (c) 2017, michael kerrisk <[email protected]> |
.\" |
.\" %%%license_start(verbatim) |
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.\" preserved on all copies. |
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.\" manual under the conditions for verbatim copying, provided that the |
.\" entire resulting derived work is distributed under the terms of a |
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.\" |
.\" since the linux kernel and libraries are constantly changing, this |
.\" manual page may be incorrect or out-of-date. the author(s) assume no |
.\" responsibility for errors or omissions, or for damages resulting from |
.\" the use of the information contained herein. the author(s) may not |
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.\" which is licensed free of charge, as they might when working |
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.\" |
.th pthread_spin_lock 3 2021-03-22 "linux" "linux programmer's manual" |
.sh name |
pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock \- |
lock and unlock a spin lock |
.sh synopsis |
.nf |
.b #include <pthread.h> |
.pp |
.bi "int pthread_spin_lock(pthread_spinlock_t *" lock ); |
.bi "int pthread_spin_trylock(pthread_spinlock_t *" lock ); |
.bi "int pthread_spin_unlock(pthread_spinlock_t *" lock ); |
.fi |
.pp |
compile and link with \fi\-pthread\fp. |
.pp |
.rs -4 |
feature test macro requirements for glibc (see |
.br feature_test_macros (7)): |
.re |
.pp |
.br pthread_spin_lock (), |
.br pthread_spin_trylock (): |
.nf |
_posix_c_source >= 200112l |
.fi |
.sh description |
the |
.br pthread_spin_lock () |
function locks the spin lock referred to by |
.ir lock . |
if the spin lock is currently unlocked, |
the calling thread acquires the lock immediately. |
if the spin lock is currently locked by another thread, |
the calling thread spins, testing the lock until it becomes available, |
at which point the calling thread acquires the lock. |
.pp |
calling |
.br pthread_spin_lock () |
on a lock that is already held by the caller |
or a lock that has not been initialized with |
.br pthread_spin_init (3) |
results in undefined behavior. |
.pp |
the |
.br pthread_spin_trylock () |
function is like |
.br pthread_spin_lock (), |
except that if the spin lock referred to by |
.i lock |
is currently locked, |
then, instead of spinning, the call returns immediately with the error |
.br ebusy . |
.pp |
the |
.br pthread_spin_unlock () |
function unlocks the spin lock referred to |
.ir lock . |
if any threads are spinning on the lock, |
one of those threads will then acquire the lock. |
.pp |
calling |
Subsets and Splits