Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

PTHREAD_ATTR_GET_NP(3)     Library Functions Manual     PTHREAD_ATTR_GET_NP(3)

NAME
     pthread_attr_get_np, pthread_getattr_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
     automatically.

     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
     conjunction 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 ALSO
     pthread(3), pthread_attr(3)

NetBSD 10.99                    August 6, 2010                    NetBSD 10.99