This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
pthread_spin_lock, pthread_spin_trylock — lock a spin lock object
int pthread_spin_lock(pthread_spinlock_t * lock);
int pthread_spin_trylock(pthread_spinlock_t * lock);
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. 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.
Upon successful completion, these functions shall return zero; otherwise, an error number shall be returned to indicate the error.
The pthread_spin_lock() function may fail if:
The pthread_spin_trylock() function shall fail if:
- A deadlock condition was detected.
These functions shall not return an error code of [EINTR].
The following sections are informative.
Applications using this function may be subject to priority inversion, as discussed in the Base Definitions volume of POSIX.1‐2008, Section 3.287, Priority Inversion.
If an implementation detects that the value specified by the lock argument to pthread_spin_lock() or pthread_spin_trylock() does not refer to an initialized spin lock object, it is recommended that the function should fail and report an [EINVAL] error.
If an implementation detects that the value specified by the lock argument to pthread_spin_lock() refers to a spin lock object for which the calling thread already holds the lock, it is recommended that the function should fail and report an [EDEADLK] error.
The Base Definitions volume of POSIX.1‐2008, Section 3.287, Priority Inversion, Section 4.11, Memory Synchronization, <pthread.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
- A thread currently holds the lock.
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