pthread_getattr_np(3) [netbsd man page]

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 auto-
     matically.

     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:

	   o   The detach state -- a joinable thread may have detached itself after the creation.

	   o   The guard size, which may vary if the application has allocated its own thread stack.

	   o   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)

BSD
								  August 6, 2010							       BSD

PTHREAD_ATTR(3) 					   BSD Library Functions Manual 					   PTHREAD_ATTR(3)

NAME

     pthread_attr_init, pthread_attr_destroy, pthread_attr_setstack, pthread_attr_getstack, pthread_attr_setguardsize, pthread_attr_getguardsize
     -- thread attribute operations

SYNOPSIS

     #include <pthread.h>

     int
     pthread_attr_init(pthread_attr_t *attr);

     int
     pthread_attr_destroy(pthread_attr_t *attr);

     int
     pthread_attr_setstack(pthread_attr_t *attr, void *stackaddr, size_t stacksize);

     int
     pthread_attr_getstack(const pthread_attr_t * restrict attr, void ** restrict stackaddr, size_t * restrict stacksize);

     int
     pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize);

     int
     pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize);

     int
     pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize);

     int
     pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize);

     int
     pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr);

     int
     pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr);

     int
     pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate);

     int
     pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate);

     int
     pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched);

     int
     pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inheritsched);

     int
     pthread_attr_setschedparam(pthread_attr_t *attr, const struct sched_param *param);

     int
     pthread_attr_getschedparam(const pthread_attr_t *attr, struct sched_param *param);

     int
     pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);

     int
     pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy);

     int
     pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);

     int
     pthread_attr_getscope(const pthread_attr_t *attr, int *contentionscope);

DESCRIPTION

     Thread attributes are used to specify parameters to pthread_create().  One attribute object can be used in multiple calls to
     pthread_create(), with or without modifications between calls.

     The pthread_attr_init() function initializes attr with all the default thread attributes.

     The pthread_attr_destroy() function destroys attr.

     The pthread_attr_set*() functions set the attribute that corresponds to each function name.

     The pthread_attr_get*() functions copy the value of the attribute that corresponds to each function name to the location pointed to by the
     second function parameter.

RETURN VALUES

     If successful, these functions return 0.  Otherwise, an error number is returned to indicate the error.

ERRORS

     The pthread_attr_init() function will fail if:

     [ENOMEM]		Out of memory.

     The pthread_attr_destroy() function will fail if:

     [EINVAL]		Invalid value for attr.

SEE ALSO

     pthread_attr_affinity_np(3), pthread_attr_get_np(3), pthread_create(3)

STANDARDS

     pthread_attr_init(), pthread_attr_destroy(), pthread_attr_setstacksize(), pthread_attr_getstacksize(), pthread_attr_setstackaddr(),
     pthread_attr_getstackaddr(), pthread_attr_setdetachstate(), and pthread_attr_getdetachstate() functions conform to ISO/IEC 9945-1:1996
     (``POSIX.1'')

     The pthread_attr_setinheritsched(), pthread_attr_getinheritsched(), pthread_attr_setschedparam(), pthread_attr_getschedparam(),
     pthread_attr_setschedpolicy(), pthread_attr_getschedpolicy(), pthread_attr_setscope(), and pthread_attr_getscope() functions conform to
     Version 2 of the Single UNIX Specification (``SUSv2'')

BSD
								  January 8, 2010							       BSD