PTHREAD_ATTR_GET_NP(3) BSD Library Functions Manual PTHREAD_ATTR_GET_NP(3)NAME
pthread_attr_get_np — get attributes of existing thread
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int
pthread_attr_get_np(pthread_t thread, pthread_attr_t *attr);
int
pthread_getattr_np(pthread_t thread, pthread_attr_t *attr);
DESCRIPTION
The pthread_attr_get_np() and pthread_getattr_np() functions can be used
to retrieve attributes of a running thread. The result is stored to
attr.
For pthread_attr_get_np() attr should be initialized prior to the call by
using pthread_attr_init(3). pthread_getattr_np() does this automati‐
cally.
For both functions attr should be freed when it is not in use anymore
with pthread_attr_destroy(3).
Most fields of attr are the same ones provided during thread creation
time as a parameter to pthread_create(3). The exceptions include:
· The detach state -- a joinable thread may have detached itself
after the creation.
· The guard size, which may vary if the application has allocated
its own thread stack.
· The stack address and size; pthread_attr_get_np() will always
return the thread's real stack address and size, regardless of
the values in the original attributes structure.
The returned pthread_attr_t structure is supposed to be used in conjunc‐
tion with the pthread_attr_get*() functions to retrieve individual values
from the structure. When the returned attr is no longer needed, it
should be destroyed by using pthread_attr_destroy(3).
RETURN VALUES
Upon successful completion, pthread_attr_get_np() and
pthread_getattr_np() return 0. Otherwise an error number is returned to
indicate the error.
COMPATIBILITY
The pthread_attr_get_np() and pthread_getattr_np() functions are non-
standard extensions.
ERRORS
The pthread_attr_get_np() and pthread_getattr_np() functions will fail
if:
[ENOMEM] Insufficient memory.
[ESRCH] Non-existent thread.
SEE ALSOpthread(3), pthread_attr(3)BSD August 6, 2010 BSD
