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PTHREAD_SPIN_DESTROY(3P) POSIX Programmer's Manual PTHREAD_SPIN_DESTROY(3P)
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_destroy, pthread_spin_init — destroy or initialize a
spin lock object
#include <pthread.h>
int pthread_spin_destroy(pthread_spinlock_t *lock);
int pthread_spin_init(pthread_spinlock_t *lock, int pshared);
The pthread_spin_destroy() function shall destroy the spin lock
referenced by lock and release any resources used by the lock. The
effect of subsequent use of the lock is undefined until the lock is
reinitialized by another call to pthread_spin_init(). The results
are undefined if pthread_spin_destroy() is called when a thread holds
the lock, or if this function is called with an uninitialized thread
spin lock.
The pthread_spin_init() function shall allocate any resources
required to use the spin lock referenced by lock and initialize the
lock to an unlocked state.
If the Thread Process-Shared Synchronization option is supported and
the value of pshared is PTHREAD_PROCESS_SHARED, the implementation
shall permit the spin lock to be operated upon by any thread that has
access to the memory where the spin lock is allocated, even if it is
allocated in memory that is shared by multiple processes.
If the Thread Process-Shared Synchronization option is supported and
the value of pshared is PTHREAD_PROCESS_PRIVATE, or if the option is
not supported, the spin lock shall only be operated upon by threads
created within the same process as the thread that initialized the
spin lock. If threads of differing processes attempt to operate on
such a spin lock, the behavior is undefined.
The results are undefined if pthread_spin_init() is called specifying
an already initialized spin lock. The results are undefined if a spin
lock is used without first being initialized.
If the pthread_spin_init() function fails, the lock is not
initialized and the contents of lock are undefined.
Only the object referenced by lock may be used for performing
synchronization.
The result of referring to copies of that object in calls to
pthread_spin_destroy(), pthread_spin_lock(), pthread_spin_trylock(),
or pthread_spin_unlock() is undefined.
Upon successful completion, these functions shall return zero;
otherwise, an error number shall be returned to indicate the error.
The pthread_spin_init() function shall fail if:
EAGAIN The system lacks the necessary resources to initialize another
spin lock.
ENOMEM Insufficient memory exists to initialize the lock.
These functions shall not return an error code of [EINTR].
The following sections are informative.
None.
None.
If an implementation detects that the value specified by the lock
argument to pthread_spin_destroy() 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_destroy() or pthread_spin_init() refers to a
locked spin lock object, or detects that the value specified by the
lock argument to pthread_spin_init() refers to an already initialized
spin lock object, it is recommended that the function should fail and
report an [EBUSY] error.
None.
pthread_spin_lock(3p), pthread_spin_unlock(3p)
The Base Definitions volume of POSIX.1‐2008, pthread.h(0p)
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 .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 PTHREAD_SPIN_DESTROY(3P)
Pages that refer to this page: pthread.h(0p), pthread_spin_lock(3p), pthread_spin_unlock(3p)