pthread_attr_create

Creates a thread attributes object.

Syntax

pthread_attr_create( attr );

Argument Data Type Access

attr opaque pthread_attr_t read

C Binding

int
pthread_attr_create (
pthread_attr_t *attr);

Arguments

attr: Thread attributes object created.

Description

This routine creates a thread attributes object that is used to specify the attributes of threads when they are created. The attributes object created by this routine is only used in calls to pthread_create.

The individual attributes (internal fields) of the attributes object are set to default values. (The default values of each attribute are discussed in the descriptions of the following routines.) Use the following routines to change the individual attributes:

   pthread_attr_setinheritsched
   pthread_attr_setprio
   pthread_attr_setsched
   pthread_attr_setstacksize

When an attributes object is used to create a thread, the values of the individual attributes determine the characteristics of the new object. Attributes objects perform similar to additional arguments to object creation. Changing individual attributes does not affect any objects that were previously created using the attributes object.

When you set the scheduling policy or priority, or both, in an attributes object, you must disable scheduling inheritance before the scheduling attributes are used.

Return Values

If an error condition occurs, this routine returns -1 and sets errno to the corresponding error value. Possible return values are as follows:

Return Error Description

0 Successful completion. -1 [ENOMEM] Insufficient memory exists to create the thread attributes object. -1 [EINVAL] The value specified by attr is invalid.