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\" $FreeBSD: src/lib/libpthread/man/pthread_attr.3,v 1.11 2002/09/16 19:29:28 mini Exp $
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Dd July 9, 2010
Dt PTHREAD_ATTR 3
Os
Sh NAME
Nm pthread_attr_init ,
Nm pthread_attr_destroy
Nd thread attribute operations
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
In pthread.h
Ft int
Fn pthread_attr_init "pthread_attr_t *attr"
Ft int
Fn pthread_attr_destroy "pthread_attr_t *attr"
Sh DESCRIPTION
Thread attributes are used to specify parameters to
Fn pthread_create .
One attribute object can be used in multiple calls to
Fn pthread_create ,
with or without modifications between the calls.
The
Vt pthread_attr_t
type is an opaque representation of the thread attributes;
any access to the object other than via the described
Fn pthread_attr_*
functions may result in undefined behavior.
Pp
The
Fn pthread_attr_init
function initializes
Fa 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
Fn pthread_attr_init ,
even if this might be unnecessary.
Undefined behavior may also follow if an already initialized
Fa attr
is used with
Fn pthread_attr_init .
Pp
When the attribute object is no longer needed,
it should be destroyed by using
Fn pthread_attr_destroy .
The function has no effect on threads that
were created by using a given attribute object.
A destroyed
Fa attr
can be reinitialized using
Fn pthread_attr_init ,
but all other actions with the destroyed object are unspecified.
Pp
The following standard thread attribute functions are available:
Bl -column -offset indent "pthread_attr_getinheritsched " "XXX"
It Sy Function Ta Sy Description
It Xr pthread_attr_getdetachstate 3 Ta thread detach state
It Xr pthread_attr_getguardsize 3 Ta thread guard size
It Xr pthread_attr_getinheritsched 3 Ta inherit scheduler attribute
It Xr pthread_attr_getschedparam 3 Ta thread scheduling parameter
It Xr pthread_attr_getschedpolicy 3 Ta thread scheduling policy
It Xr pthread_attr_getscope 3 Ta thread contention scope
It Xr pthread_attr_getstack 3 Ta thread stack
It Xr pthread_attr_getstacksize 3 Ta thread stack size
It Xr pthread_attr_getstackaddr 3 Ta thread stack address
El
Pp
Each listed
Fn pthread_attr_get*
function has a
Fn pthread_attr_set*
counterpart.
In addition, the following
Nx
specific extensions are available:
Bl -column -offset indent "pthread_attr_getinheritsched " "XXX"
It Sy Function Ta Sy Description
It Xr pthread_attr_get_np 3 Ta attributes of a running thread
It Xr pthread_attr_getname_np 3 Ta descriptive name of an attribute
El
Sh RETURN VALUES
If successful, these functions return 0.
Otherwise, an error number is returned to indicate the error.
Sh ERRORS
No errors are defined for
Fn pthread_attr_init
and
Fn pthread_attr_destroy .
Sh SEE ALSO
Xr pthread_create 3 ,
Xr pthread_join 3
Sh STANDARDS
Both
Fn pthread_attr_init
and
Fn pthread_attr_destroy
conform to
St -p1003.1-2001 .

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