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PTHREAD_SPIN_DESTROY
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
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PROLOG
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.
NAME
pthread_spin_destroy, pthread_spin_init - destroy or initialize a
spin lock object (ADVANCED REALTIME
THREADS)
SYNOPSIS
#include <pthread.h>
int pthread_spin_destroy(pthread_spinlock_t * lock);
int pthread_spin_init(pthread_spinlock_t *lock, int
pshared);
DESCRIPTION
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.
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:
- EBUSY
-
The implementation has detected an attempt to initialize or destroy
a spin lock while it is in use (for example, while being
used in a pthread_spin_lock() call) by another thread.
- EINVAL
-
The value specified by lock is invalid.
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.
EXAMPLES
None.
APPLICATION USAGE
The pthread_spin_destroy() and pthread_spin_init() functions
are part of the Spin Locks option and need not be
provided on all implementations.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_spin_lock(), pthread_spin_unlock(), the Base
Definitions volume of IEEE Std 1003.1-2001, <pthread.h>
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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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