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pthread_attr_init(3)

NAME

     pthread_attr_init, pthread_attr_destroy, pthread_attr_setstack,
     pthread_attr_getstack, pthread_attr_setstacksize,
     pthread_attr_getstacksize, pthread_attr_setguardsize,
     pthread_attr_getguardsize, pthread_attr_setstackaddr,
     pthread_attr_getstackaddr, pthread_attr_setdetachstate,
     pthread_attr_getdetachstate, pthread_attr_setinheritsched,
     pthread_attr_getinheritsched, pthread_attr_setschedparam,
     pthread_attr_getschedparam, pthread_attr_setschedpolicy,
     pthread_attr_getschedpolicy, pthread_attr_setscope, pthread_attr_getscope
     -- thread attribute operations

LIBRARY

     Reentrant C Library (libc_r, -lc_r)
     POSIX Threads Library (libpthread, -lpthread)
     1:1 Threading Library (libthr, -lthr)

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
     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 sec-
     ond 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.

     The pthread_attr_setstacksize() and pthread_attr_setstack() functions
     will fail if:

     [EINVAL]		stacksize is less than PTHREAD_STACK_MIN.

     The pthread_attr_setdetachstate() function will fail if:

     [EINVAL]		Invalid value for attr.

     [ENOTSUP]		Invalid value for param.

     The pthread_attr_setschedpolicy() function will fail if:

     [EINVAL]		Invalid value for attr.

     [ENOTSUP]		Invalid or unsupported value for policy.

     The pthread_attr_setscope() function will fail if:

     [EINVAL]		Invalid value for attr.

     [ENOTSUP]		Invalid or unsupported value for contentionscope.

SEE ALSO

     pthread_attr_get_np(3), pthread_create(3)

STANDARDS

     The 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() func-
     tions 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'')

FreeBSD 5.4			April 28, 2000			   FreeBSD 5.4

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