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pthread_getattr_np(3c)
Standard C Library Functions pthread_getattr_np(3C)
NAME
pthread_getattr_np - get attributes of thread
SYNOPSIS
#include <pthread.h>
int pthread_getattr_np(pthread_t t, pthread_attr_t *attr);
DESCRIPTION
The pthread_getattr_np() function allocates and initializes a thread
attribute object with values representing an existing thread. The val‐
ues of the fields in the pthread_attr_t structure are usually the same
as those provided during the creation of thread by using the
pthread_create() function or the thr_create() function. However, the
following factors occur:
o Stack address is often different due to memory alignment or
other platform requirements
o The schedule inheritance will always match the default value
o The detach or daemon states of a thread may have changed
after the thread gets created
Some of these values are subject to change. The pthread_getattr_np()
function returns a snapshot of the current state. The thread attributes
object returned as attr, is intended for use with the various
pthread_attr_get*() functions to extract individual pieces of informa‐
tion such as the stack address. For example, the pthread_attr_getstack‐
addr() function. The caller is responsible for freeing the memory allo‐
cated for attr by calling the pthread_attr_destroy() function.
RETURN VALUES
If successful, the pthread_getattr_np() function returns 0. Otherwise,
an error number is returned to indicate the error. It is not an error
for the target thread to be a zombie thread.
ERRORS
The pthread_getattr_np() function will fail if:
EFAULT One or more attributes of thread could not be determined
EINVAL attr is NULL
ESRCH The value specified by a thread does not refer to an existing
thread
EXAMPLES
Example 1 Retrieve a Thread's Stack Address and Size
The following is an example that shows how to retrieve a thread's cur‐
rent stack address and size.
/* cc thisfile.c */
# include <pthread.h>
# include <stdio.h>
int
main(int argc, char *argv[])
{
pthread_attr_t attr;
size_t stksize;
void *stkaddr;
(void) pthread_getattr_np(pthread_self(), &attr);
(void) pthread_attr_getstack(&attr, &stkaddr, &stksize);
(void) pthread_attr_destroy(&attr);
printf("Stack Address = %p\n", stkaddr);
printf("Stack Size = %zu\n", stksize);
return (0);
}
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe
SEE ALSO
pthread_attr_init(3C), pthread_attr_destroy(3C), threads(7),
attributes(7), standards(7)
Oracle Solaris 11.4 08 Aug 2017 pthread_getattr_np(3C)