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pthread_attr_init()

Initialize a thread-attribute object

Synopsis:

#include <pthread.h>

int pthread_attr_init( pthread_attr_t *attr );

Arguments:

attr

A pointer to the pthread_attr_t structure that you want to initialize. For more information, see below.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_attr_init() function initializes the thread attributes in the thread attribute object attr to their default values:

Attribute	Default Value
detachstate	PTHREAD_CREATE_JOINABLE
schedpolicy	PTHREAD_INHERIT_SCHED
schedparam	Inherited from parent thread
contentionscope	PTHREAD_SCOPE_SYSTEM
stacksize	4K bytes
stackaddr	NULL

After initialization, you can use the pthread_attr_* family of functions to get and set the attributes:

Get	Set
pthread_attr_getdetachstate()	pthread_attr_setdetachstate()
pthread_attr_getguardsize()	pthread_attr_setguardsize()
pthread_attr_getinheritsched()	pthread_attr_setinheritsched()
pthread_attr_getschedparam()	pthread_attr_setschedparam()
pthread_attr_getschedpolicy()	pthread_attr_setschedpolicy()
pthread_attr_getscope()	pthread_attr_setscope()
pthread_attr_getstackaddr()	pthread_attr_setstackaddr()
pthread_attr_getstacklazy()	pthread_attr_setstacklazy()
pthread_attr_getstacksize()	pthread_attr_setstacksize()

You can also set some non-POSIX attributes; for more information, see "QNX extensions," in the documentation for pthread_create().

You can then pass the attribute object to pthread_create() to create a thread with the required attributes. You can use the same attribute object in multiple calls to pthread_create().

The effect of initializing an already-initialized thread-attribute object is undefined.

Returns:

EOK

Success.

Classification:

POSIX 1003.1 THR

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes

See also:

pthread_attr_destroy(), pthread_create()

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