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.TH PTHREAD_SPIN_DESTROY 3C "Jan 30, 2004"
.SH NAME
pthread_spin_destroy, pthread_spin_init \- destroy or initialize a spin lock
object
.SH SYNOPSIS
.LP
.nf
cc \fB-mt\fR [ \fIflag\fR... ] \fIfile\fR... [ \fIlibrary\fR... ]
#include <pthread.h>

\fBint\fR \fBpthread_spin_destroy\fR(\fBpthread_spinlock_t *\fR\fIlock\fR);
.fi

.LP
.nf
\fBint\fR \fBpthread_spin_init\fR(\fBpthread_spinlock_t *\fR\fIlock\fR, \fBint\fR \fIpshared\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBpthread_spin_destroy()\fR function destroys the spin lock referenced by
\fIlock\fR 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
\fBpthread_spin_init()\fR. The results are undefined if
\fBpthread_spin_destroy()\fR is called when a thread holds the lock, or if this
function is called with an uninitialized thread spin lock.
.sp
.LP
The \fBpthread_spin_init()\fR function allocates any resources required to use
the spin lock referenced by \fIlock\fR and initialize the lock to an unlocked
state.
.sp
.LP
If the Thread Process-Shared Synchronization option is supported and the value
of \fIpshared\fR is \fBPTHREAD_PROCESS_SHARED\fR, the spin lock can 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.
.sp
.LP
If the Thread Process-Shared Synchronization option is supported and the value
of \fIpshared\fR is \fBPTHREAD_PROCESS_PRIVATE\fR, or if the option is not
supported, the spin lock can 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.
.sp
.LP
The results are undefined if \fBpthread_spin_init()\fR is called specifying an
already initialized spin lock. The results are undefined if a spin lock is used
without first being initialized.
.sp
.LP
If the \fBpthread_spin_init()\fR function fails, the lock is not initialized
and the contents of \fIlock\fR are undefined.
.sp
.LP
Only the object referenced by \fIlock\fR can be used for performing
synchronization.
.sp
.LP
The result of referring to copies of that object in calls to
\fBpthread_spin_destroy()\fR, \fBpthread_spin_lock\fR(3C),
\fBpthread_spin_trylock\fR(3C), or \fBpthread_spin_unlock\fR(3C) is undefined.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, these functions returns 0. Otherwise, an error
number is returned to indicate the error.
.SH ERRORS
.sp
.LP
The \fBpthread_spin_init()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEAGAIN\fR\fR
.ad
.RS 10n
The system lacks the necessary resources to initialize another spin lock.
.RE

.sp
.LP
These functions may fail if:
.sp
.ne 2
.na
\fB\fBEBUSY\fR\fR
.ad
.RS 10n
The system has detected an attempt to initialize or destroy a spin lock while
it is in use (for example, while being used in a \fBpthread_spin_lock()\fR
call) by another thread.
.RE

.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The value specified by \fIlock\fR is invalid.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBpthread_spin_lock\fR(3C), \fBpthread_spin_unlock\fR(3C),
\fBattributes\fR(5), \fBstandards\fR(5)