'\" te
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.TH PTHREAD_CONDATTR_GETCLOCK 3C "Jan 30, 2004"
.SH NAME
pthread_condattr_getclock, pthread_condattr_setclock \- get and set the clock
selection condition variable attribute
.SH SYNOPSIS
.LP
.nf
cc \fB-mt\fR [ \fIflag\fR... ] \fIfile\fR... [ \fIlibrary\fR... ]
#include <pthread.h>

\fBint\fR \fBpthread_condattr_getclock\fR(
     \fBconst pthread_condattr_t *restrict\fR \fIattr\fR,
     \fBclockid_t *restrict\fR \fIclock_id\fR);
.fi

.LP
.nf
\fBint\fR \fBpthread_condattr_setclock\fR(\fBpthread_condattr_t *\fR\fIattr\fR
      \fBclockid_t\fR \fIclock_id\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBpthread_condattr_getclock()\fR function obtains the value of the clock
attribute from the attributes object referenced by \fIattr\fR. The
\fBpthread_condattr_setclock()\fR function sets the clock attribute in an
initialized attributes object referenced by \fIattr\fR. If
\fBpthread_condattr_setclock()\fR is called with a \fIclock_id\fR argument that
refers to a CPU-time clock, the call fails.
.sp
.LP
The clock attribute is the clock ID of the clock that is used to measure the
timeout service of \fBpthread_cond_timedwait\fR(3C). The default value of the
clock attribute refers to the system clock.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, the \fBpthread_condattr_getclock()\fR function
returns 0 and stores the value of the clock attribute of \fIattr\fR into the
object referenced by the \fIclock_id\fR argument. Otherwise, an error number is
returned to indicate the error.
.sp
.LP
Upon successful completion, the \fBpthread_condattr_setclock()\fR function
returns 0. Otherwise, an error number is returned to indicate the error.
.SH ERRORS
.sp
.LP
These functions may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The value specified by \fIattr\fR is invalid.
.RE

.sp
.LP
The \fBpthread_condattr_setclock()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The value specified by \fIclock_id\fR does not refer to a known clock, or is a
CPU-time clock.
.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_cond_init\fR(3C), \fBpthread_cond_timedwait\fR(3C),
\fBpthread_condattr_destroy\fR(3C), \fBpthread_condattr_getpshared\fR(3C),
\fBpthread_create\fR(3C), \fBpthread_mutex_init\fR(3C), \fBattributes\fR(5),
\fBstandards\fR(5)