Rich Felker
14a835b386
this function is mainly (purely?) for obtaining stack address information, but we also provide the detach state since it's easy to do anyway.
22 lines
562 B
C
22 lines
562 B
C
#include "pthread_impl.h"
|
|
#include <sys/mman.h>
|
|
|
|
int pthread_getattr_np(pthread_t t, pthread_attr_t *a)
|
|
{
|
|
*a = (pthread_attr_t){0};
|
|
a->_a_detach = !!t->detached;
|
|
if (t->stack) {
|
|
a->_a_stackaddr = (uintptr_t)t->stack;
|
|
a->_a_stacksize = t->stack_size - DEFAULT_STACK_SIZE;
|
|
} else {
|
|
char *p = (void *)libc.auxv;
|
|
size_t l = PAGE_SIZE;
|
|
p += -(uintptr_t)p & PAGE_SIZE-1;
|
|
a->_a_stackaddr = (uintptr_t)p;
|
|
while (!posix_madvise(p-l-PAGE_SIZE, PAGE_SIZE, POSIX_MADV_NORMAL))
|
|
l += PAGE_SIZE;
|
|
a->_a_stacksize = l - DEFAULT_STACK_SIZE;
|
|
}
|
|
return 0;
|
|
}
|