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
libpthread

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 * restrict inheritsched);
int
pthread_attr_setschedparam(pthread_attr_t * restrict attr, const struct sched_param * restrict param);
int
pthread_attr_getschedparam(const pthread_attr_t * restrict attr, struct sched_param * restrict 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_setguardsize() and pthread_attr_getguardsize() functions will fail if:

[EINVAL]
    Invalid value for guardsize.

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 inheritsched or uninitialized 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 policy or uninitialized attr.

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() functions conform to p1003.1-96.

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 susv2.