PTHREAD_ATTR(3) BSD Library Functions Manual PTHREAD_ATTR(3)NAME
pthread_attr_init, pthread_attr_destroy — thread attribute operations
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int
pthread_attr_init(pthread_attr_t *attr);
int
pthread_attr_destroy(pthread_attr_t *attr);
DESCRIPTION
Thread attributes are used to specify parameters to pthread_create().
One attribute object can be used in multiple calls to pthread_create(),
with or without modifications between the calls. The pthread_attr_t type
is an opaque representation of the thread attributes; any access to the
object other than via the described pthread_attr_*() functions may result
in undefined behavior.
The pthread_attr_init() function initializes attr with the default thread
attributes used in the implementation. Depending on the implementation,
undefined behavior may follow if an uninitialized thread attribute object
is used with some of the thread attribute functions. It is therefore a
good practice to always use pthread_attr_init(), even if this might be
unnecessary. Undefined behavior may also follow if an already initial‐
ized attr is used with pthread_attr_init().
When the attribute object is no longer needed, it should be destroyed by
using pthread_attr_destroy(). The function has no effect on threads that
were created by using a given attribute object. A destroyed attr can be
reinitialized using pthread_attr_init(), but all other actions with the
destroyed object are unspecified.
The following standard thread attribute functions are available:
Function Description
pthread_attr_getdetachstate(3) thread detach state
pthread_attr_getguardsize(3) thread guard size
pthread_attr_getinheritsched(3) inherit scheduler attribute
pthread_attr_getschedparam(3) thread scheduling parameter
pthread_attr_getschedpolicy(3) thread scheduling policy
pthread_attr_getscope(3) thread contention scope
pthread_attr_getstack(3) thread stack
pthread_attr_getstacksize(3) thread stack size
pthread_attr_getstackaddr(3) thread stack address
Each listed pthread_attr_get*() function contains a pthread_attr_set*()
counterpart. In addition, the following NetBSD specific extensions are
available:
Function Description
pthread_attr_get_np(3) attributes of a running thread
pthread_attr_getname_np(3) descriptive name of an attribute
RETURN VALUES
If successful, these functions return 0. Otherwise, an error number is
returned to indicate the error.
ERRORS
No errors are defined for pthread_attr_init() and pthread_attr_destroy().
SEE ALSOpthread_create(3), pthread_join(3)STANDARDS
Both pthread_attr_init() and pthread_attr_destroy() conform to IEEE Std
1003.1-2001 (“POSIX.1”).
BSD July 9, 2010 BSD
