pthread_condattr_init(3) Library Functions Manual pthread_condattr_init(3)
NAME
pthread_condattr_init - Initializes a condition variable attributes object.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
int pthread_condattr_init(
pthread_condattr_t *attr);
STANDARDS
Interfaces documented on this reference page conform to industry standards 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 specified 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 arguments 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
interface and to conform with the POSIX.1c standard. These routines serve no useful function, because there are no pthread_con-
dattr_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 condition variable attributes object. Insufficient memory exists to
initialize the condition variable attributes object.
ERRORS
None
RELATED INFORMATION
Functions: pthread_condattr_destroy(3), pthread_cond_init(3)
Manuals: Guide to DECthreads and Programmer's Guide
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pthread_condattr_init(3)
