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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD_..._DESTROY(3P) POSIX Programmer's ManualPTHREAD_..._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.
See Section 2.9.9, Synchronization Object Copies and Alternative
Mappings for further requirements.
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.1‐2017, pthread.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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 2017 PTHREAD_..._DESTROY(3P)
Pages that refer to this page: pthread.h(0p), pthread_spin_lock(3p), pthread_spin_unlock(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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