nsz Git - musl/blob - src/thread/pthread_getattr_np.c

   1 #include "pthread_impl.h"
   2 #include <sys/mman.h>
   3
   4 int pthread_getattr_np(pthread_t t, pthread_attr_t *a)
   5 {
   6         *a = (pthread_attr_t){0};
   7         a->_a_detach = !!t->detached;
   8         if (t->stack) {
   9                 a->_a_stackaddr = (uintptr_t)t->stack;
  10                 a->_a_stacksize = t->stack_size - DEFAULT_STACK_SIZE;
  11         } else {
  12                 char *p = (void *)libc.auxv;
  13                 size_t l = PAGE_SIZE;
  14                 p += -(uintptr_t)p & PAGE_SIZE-1;
  15                 a->_a_stackaddr = (uintptr_t)p;
  16                 while (!posix_madvise(p-l-PAGE_SIZE, PAGE_SIZE, POSIX_MADV_NORMAL))
  17                         l += PAGE_SIZE;
  18                 a->_a_stacksize = l - DEFAULT_STACK_SIZE;
  19         }
  20         return 0;
  21 }