PTHREAD_ATTR(3)        FreeBSD Library Functions Manual        PTHREAD_ATTR(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
     POSIX Threads Library (libpthread, -lpthread)

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 *restrict attr,
         size_t *restrict stacksize);

     int
     pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize);

     int
     pthread_attr_getguardsize(const pthread_attr_t * restrict attr,
         size_t * restrict 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 *restrict attr,
         int *restrct 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 *restrict attr,
         int *restrict policy);

     int
     pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);

     int
     pthread_attr_getscope(const pthread_attr_t *restrict attr,
         int *restrict 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.

     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 detachstate.

     The pthread_attr_setinheritsched() function will fail if:

     [EINVAL]           Invalid value for attr.

     The pthread_attr_setschedparam() 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_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")

FreeBSD 13.1-RELEASE-p6         August 17, 2018        FreeBSD 13.1-RELEASE-p6