pthread_attr_init(3T)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO

NAME

pthread_attr_init, pthread_attr_destroy- initialize or destroy threads attribute object

SYNOPSIS

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);

DESCRIPTION

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	NULL	1 or 2 megabyte
priority	0	priority of the thread
policy	SCHED_OTHER	determined by system
inheritsched	PTHREAD_EXPLICIT_SCHED	scheduling policy and parameters not inherited but explicitly defined by the attribute object
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.

RETURN VALUES

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.

ERRORS

The pthread_attr_init() function will fail if:

ENOMEM

Insufficient memory exists to initialize the thread attributes object.

The pthread_attr_destroy() function may fail if:

EINVAL

attr is invalid.

ATTRIBUTES

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
MT-Level	MT-Safe

SEE ALSO

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

SunOS 5.7  Last Revised 28 Apr 1998

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO