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Man Pages


Manual Reference Pages  -  PTHREAD_ATTR_GET_NP (3)

NAME

pthread_attr_get_np - get attributes of existent thread

CONTENTS

Library
Synopsis
Description
Implementation Notes
Return Values
Examples
Errors
See Also
Authors

LIBRARY


.Lb libpthread

SYNOPSIS


.In pthread_np.h int pthread_attr_get_np pthread_t pid pthread_attr_t *dst

DESCRIPTION

The pthread_attr_get_np function is used to get existent thread’s attributes. Most fields of
.Vt pthread_attr_t structure are exact values of attributes provided at thread creation time (as parameter to pthread_create(3) function), except for the stack address.

Value returned as dst is supposed to be used in conjunction with pthread_attr_get* functions to retrieve individual values from
.Vt pthread_attr_t structure. Parameter dst should point to allocated memory area big enough to fit this structure.

It is HIGHLY RECOMMENDED to use pthread_attr_init(3) function to allocate attribute storage.

IMPLEMENTATION NOTES

The pthread_attr_get_np function will always return a pointer to the thread’s real stack address, regardless of its value in the original attributes structure.

RETURN VALUES

If successful, pthread_attr_get_np function returns 0. Otherwise, an error number is returned to indicate the error.

EXAMPLES

size_t
my_thread_stack_size(pthread_t pid)
{
    pthread_attr_t attr;
    size_t size;

pthread_attr_init(&attr); pthread_attr_get_np(pid, &attr); pthread_attr_getstacksize(&attr, &size); pthread_attr_destroy(&attr); return(size); }

ERRORS

The pthread_attr_get_np function will fail if:
[EINVAL]
  Invalid value for one of given parameters.
[ESRC] No thread could be found corresponding to that specified by the given thread ID.

SEE ALSO

pthread_attr_destroy(3), pthread_attr_getdetachstate(3), pthread_attr_getinheritsched(3), pthread_attr_getschedparam(3), pthread_attr_getschedpolicy(3), pthread_attr_getscope(3), pthread_attr_getstack(3), pthread_attr_getstackaddr(3), pthread_attr_getstacksize(3), pthread_attr_init(3)

AUTHORS

The pthread_attr_get_np function and this manual page were written by
.An Alexey Zelkin <phantom@FreeBSD.org>.
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