pthread_attr_get_np(3) - NetBSD Manual Pages

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PTHREAD_ATTR_GET_NP(3)  NetBSD 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 ALSO

     pthread(3), pthread_attr(3)

NetBSD 8.0                      August 6, 2010                      NetBSD 8.0