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.\"
.TH PTHREAD_CONDATTR_INIT 3C "Mar 23, 2005"
.SH NAME
pthread_condattr_init, pthread_condattr_destroy \- initialize or destroy
condition variable attributes object
.SH SYNOPSIS
.LP
.nf
cc -mt [ \fIflag\fR... ] \fIfile\fR... -lpthread [ \fIlibrary\fR... ]
#include <pthread.h>
\fBint\fR \fBpthread_condattr_init\fR(\fBpthread_condattr_t *\fR\fIattr\fR);
.fi
.LP
.nf
\fBint\fR \fBpthread_condattr_destroy\fR(\fBpthread_condattr_t *\fR\fIattr\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBpthread_condattr_init()\fR function initializes a condition variable
attributes object \fIattr\fR with the default value for all of the attributes
defined by the implementation.
.sp
.LP
At present, the only attribute available is the scope of condition variables.
The default scope of the attribute is \fBPTHREAD_PROCESS_PRIVATE\fR.
.sp
.LP
Attempts to initialize previously initialized condition variable attributes
object will leave the storage allocated by the previous initialization
unallocated.
.sp
.LP
After a condition variable attributes object has been used to initialize one or
more condition variables, any function affecting the attributes object
(including destruction) does not affect any previously initialized condition
variables.
.sp
.LP
The \fBpthread_condattr_destroy()\fR function destroys a condition variable
attributes object; the object becomes, in effect, uninitialized. An
implementation may cause \fBpthread_condattr_destroy()\fR to set the object
referenced by \fIattr\fR to an invalid value. A destroyed condition variable
attributes object can be re-initialized using \fBpthread_condattr_init()\fR;
the results of otherwise referencing the object after it has been destroyed are
undefined.
.sp
.LP
Additional attributes, their default values, and the names of the associated
functions to get and set those attribute values are implementation-dependent.
.SH RETURN VALUES
.sp
.LP
If successful, the \fBpthread_condattr_init()\fR and
\fBpthread_condattr_destroy()\fR functions return \fB0\fR. Otherwise, an error
number is returned to indicate the error.
.SH ERRORS
.sp
.LP
The \fBpthread_condattr_init()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBENOMEM\fR\fR
.ad
.RS 10n
Insufficient memory exists to initialize the condition variable attributes
object.
.RE
.sp
.LP
The \fBpthread_condattr_destroy()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The value specified by \fIattr\fR is invalid.
.RE
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) 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
.BR pthread_cond_init (3C),
.BR pthread_condattr_getpshared (3C),
.BR pthread_condattr_setpshared (3C),
.BR pthread_create (3C),
.BR pthread_mutex_init (3C),
.BR attributes (7),
.BR standards (7)
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