pthread_attr_init(3C) pthread_attr_init(3C)
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);
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.
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 Insufficient memory exists to initialize the thread attributes object.
The pthread_attr_destroy() function may fail if:
EINVAL attr is invalid.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
sysconf(3C), pthread_attr_getdetachstate(3C), pthread_attr_getguardsize(3C), pthread_attr_getinheritsched(3C), pthread_attr_getsched-
param(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_cre-
ate(3C), attributes(5), standards(5)
23 Mar 2005 pthread_attr_init(3C)
