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PTHREAD_ATTR_GET_NP (3) | C library functions | Unix Manual Pages | :man

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 libc_r
.Lb libpthread
.Lb libthr

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


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