pthread_condattr_init(3)pthread_condattr_init(3)NAMEpthread_condattr_init - Initializes a condition variable attributes
object
SYNOPSIS
#include <pthread.h>
int pthread_condattr_init(
pthread_condattr_t *attr );
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
PARAMETERS
Address of the condition variable attributes object to be initialized.
DESCRIPTION
This routine initializes the condition variable attributes object spec‐
ified by the (attr) argument with a set of default attribute values.
When an attributes object is used to create a condition variable, the
values of the individual attributes determine the characteristics of
the new condition variable. Attributes objects act as additional argu‐
ments to condition variable creation. Changing individual attributes in
an attributes object does not affect any condition variables that were
previously created using that attributes object.
You can use the same condition variable attributes object in successive
calls to pthread_condattr_init(3), from any thread. If multiple threads
can change attributes in a shared attributes object, your program must
use a mutex to protect the integrity of that attributes object.
Results are undefined if this routine is called and the attr argument
specifies a condition variable attributes object that is already ini‐
tialized.
The pthread_condattr_init(3) and pthread_condattr_destroy(3) routines
are provided for future expandability of the DECthreads pthread inter‐
face and to conform with the POSIX.1c standard. These routines serve no
useful function, because there are no pthread_condattr_set*(3) type
routines available at this time.
RETURN VALUES
If an error condition occurs, this routine returns an integer value
indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by attr is not a valid con‐
dition variable attributes object. Insufficient memory exists to ini‐
tialize the condition variable attributes object.
ERRORS
None
SEE ALSO
Functions: pthread_condattr_destroy(3), pthread_cond_init(3)
Manuals: Guide to DECthreads and Programmer's Guide
pthread_condattr_init(3)
