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Dd August 6, 2010
Dt PTHREAD_ATTR_GET_NP 3
Os
Sh NAME
Nm pthread_attr_get_np ,
Nm pthread_getattr_np
Nd get attributes of existing thread
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
In pthread.h
Ft int
Fn pthread_attr_get_np "pthread_t thread" "pthread_attr_t *attr"
Ft int
Fn pthread_getattr_np "pthread_t thread" "pthread_attr_t *attr"
Sh DESCRIPTION
The
Fn pthread_attr_get_np
and
Fn pthread_getattr_np
functions can be used to retrieve attributes of a running
Fa thread .
The result is stored to
Fa attr .
Pp
For
Fn pthread_attr_get_np
Fa attr
should be initialized prior to the call by using
Xr pthread_attr_init 3 .
Fn pthread_getattr_np
does this automatically.
Pp
For both functions
Fa attr
should be freed when it is not in use anymore with
Xr pthread_attr_destroy 3 .
Pp
Most fields of
Fa attr
are the same ones provided during thread creation time as a parameter to
Xr pthread_create 3 .
The exceptions include:
Bl -bullet -offset indent
It
The detach state -- a joinable thread
may have detached itself after the creation.
It
The guard size, which may vary if the application
has allocated its own thread stack.
It
The stack address and size;
Fn pthread_attr_get_np
will always return the thread's real stack address and size,
regardless of the values in the original attributes structure.
El
Pp
The returned
Vt pthread_attr_t
structure is supposed to be used in conjunction with the
Fn pthread_attr_get*
functions to retrieve individual values from the structure.
When the returned
Fa attr
is no longer needed, it should be destroyed by using
Xr pthread_attr_destroy 3 .
Sh RETURN VALUES
Upon successful completion,
Fn pthread_attr_get_np
and
Fn pthread_getattr_np
return 0.
Otherwise an error number is returned to indicate the error.
Sh COMPATIBILITY
The
Fn pthread_attr_get_np
and
Fn pthread_getattr_np
functions are non-standard extensions.
Sh ERRORS
The
Fn pthread_attr_get_np
and
Fn pthread_getattr_np
functions will fail if:
Bl -tag -width Er
It Bq Er ENOMEM
Insufficient memory.
It Bq Er ESRCH
Non-existent
Fa thread .
El
Sh SEE ALSO
Xr pthread 3 ,
Xr pthread_attr 3

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