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pthread_attr_init, pthread_attr_destroy - initialize or destroy threads attribute object

cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>

int pthread_attr_init(pthread_attr_t *attr);

int pthread_attr_destroy(pthread_attr_t *attr);

The function pthread_attr_init() initializes a thread attributes object attr with the default value for all of the individual attributes used by a given implementation.

The resulting attribute object (possibly modified by setting individual attribute values), when used by pthread_create(), defines the attributes of the thread created. A single attributes object can be used in multiple simultaneous calls to pthread_create().

The pthread_attr_init() function initializes a thread attributes object ( attr) with the default value for each attribute as follows:

Attribute	Default Value	Meaning of Default
contentionscope	PTHREAD_SCOPE_PROCESS	resource competition within process
detachstate	PTHREAD_CREATE_JOINABLE	joinable by other threads
stackaddr	NULL	stack allocated by system
stacksize	0	1 or 2 megabyte
priority	0	priority of the thread
policy	SCHED_OTHER	traditional time-sharing policy
inheritsched	PTHREAD_INHERIT_SCHED
scheduling policy and parameters are inherited from the creating thread
guardsize	PAGESIZE
size of guard area for a thread's created stack

The pthread_attr_destroy() function destroys a thread attributes object ( attr), which cannot be reused until it is reinitialized. An implementation may cause pthread_attr_destroy() to set attr to an implementation-dependent invalid value. The behavior of using the attribute after it has been destroyed is undefined.

Upon successful completion, pthread_attr_init() and pthread_attr_destroy() return a value of 0. Otherwise, an error number is returned to indicate the error.

The pthread_attr_init() function will fail if:

ENOMEM

The pthread_attr_destroy() function may fail if:

EINVAL

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Committed
MT-Level	MT-Safe
Standard	See standards(5).

sysconf(3C), pthread_attr_getdetachstate(3C), pthread_attr_getguardsize(3C), pthread_attr_getinheritsched(3C), pthread_attr_getschedparam(3C), pthread_attr_getschedpolicy(3C), pthread_attr_getscope(3C), pthread_attr_getstackaddr(3C), pthread_attr_getstacksize(3C), pthread_attr_setdetachstate(3C), pthread_attr_setguardsize(3C), pthread_attr_setinheritsched(3C), pthread_attr_setschedparam(3C), pthread_attr_setschedpolicy(3C), pthread_attr_setscope(3C), pthread_attr_setstackaddr(3C), pthread_attr_setstacksize(3C), pthread_create(3C), attributes(5), standards(5)