"PTHREAD_SPIN_LOCK"(P) manual page

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POSIX Threads for Windows – REFERENCE - Pthreads-w32

Reference Index

Table of Contents

Name

pthread_spin_lock, pthread_spin_trylock - lock a spin lock object +(ADVANCED REALTIME THREADS) +

Synopsis

#include <pthread.h> +

int pthread_spin_lock(pthread_spinlock_t *lock); +
int pthread_spin_trylock(pthread_spinlock_t *lock); + +

Description

The pthread_spin_lock function shall lock the spin lock +referenced by lock. The calling thread shall acquire the lock +if it is not held by another thread. Otherwise, the thread shall spin +(that is, shall not return from the pthread_spin_lock call) +until the lock becomes available. The results are undefined if the +calling thread holds the lock at the time the call is made.

Pthreads-w32 supports single and multiple processor systems +as well as process CPU affinity masking by checking the mask when the +spin lock is initialized. If the process is using only a single +processor at the time pthread_spin_init(3) +is called then the spin lock is initialized as a PTHREAD_MUTEX_NORMAL +mutex object. A thread that calls pthread_spin_lock will block +rather than spin in this case. If the process CPU affinity mask is +altered after the spin lock has been initialised, the spin lock is +not modified, and may no longer be optimal for the number of CPUs +available.

The pthread_spin_trylock function shall lock the spin lock +referenced by lock if it is not held by any thread. Otherwise, +the function shall fail. +

The results are undefined if any of these functions is called with +an uninitialized spin lock. +

Return Value

Upon successful completion, these functions shall return zero; +otherwise, an error number shall be returned to indicate the error. +

Errors

These functions may fail if: +

EINVAL +: + The value specified by lock does not refer to an initialized + spin lock object. +

+The pthread_spin_trylock function shall fail if: +

EBUSY +: + A thread currently holds the lock. +

+These functions shall not return an error code of [EINTR]. +

The following sections are informative. +

Examples

None. +

Application Usage

Applications using this function may be subject to priority +inversion, as discussed in the Base Definitions volume of +IEEE Std 1003.1-2001, Section 3.285, Priority Inversion. +

Rationale

None. +

Future Directions

None. +

Copyright

Portions of this text are reprinted and reproduced in electronic +form from IEEE Std 1003.1, 2003 Edition, Standard for Information +Technology -- Portable Operating System Interface (POSIX), The Open +Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the +Institute of Electrical and Electronics Engineers, Inc and The Open +Group. In the event of any discrepancy between this version and the +original IEEE and The Open Group Standard, the original IEEE and The +Open Group Standard is the referee document. The original Standard +can be obtained online at http://www.opengroup.org/unix/online.html +. +

Modified by Ross Johnson for use with Pthreads-w32.

Table of Contents

Name +
+
Synopsis +
+
Description +
+
Return + Value +
+
Errors +
+
Examples +
+
Application + Usage +
+
Rationale +
+
Future + Directions +
+
See + Also +
+
Copyright +
+

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