libc-top-half/musl/src/thread/pthread_setattr_default_np.c

   1 #define _GNU_SOURCE
   2 #include "pthread_impl.h"
   3 #include <string.h>
   4
   5 #define MIN(a,b) ((a)<(b) ? (a) : (b))
   6 #define MAX(a,b) ((a)>(b) ? (a) : (b))
   7
   8 int pthread_setattr_default_np(const pthread_attr_t *attrp)
   9 {
  10         /* Reject anything in the attr object other than stack/guard size. */
  11         pthread_attr_t tmp = *attrp, zero = { 0 };
  12         tmp._a_stacksize = 0;
  13         tmp._a_guardsize = 0;
  14         if (memcmp(&tmp, &zero, sizeof tmp))
  15                 return EINVAL;
  16
  17         unsigned stack = MIN(attrp->_a_stacksize, DEFAULT_STACK_MAX);
  18         unsigned guard = MIN(attrp->_a_guardsize, DEFAULT_GUARD_MAX);
  19
  20         __inhibit_ptc();
  21         __default_stacksize = MAX(__default_stacksize, stack);
  22         __default_guardsize = MAX(__default_guardsize, guard);
  23         __release_ptc();
  24
  25         return 0;
  26 }
  27
  28 int pthread_getattr_default_np(pthread_attr_t *attrp)
  29 {
  30         __acquire_ptc();
  31         *attrp = (pthread_attr_t) {
  32                 ._a_stacksize = __default_stacksize,
  33                 ._a_guardsize = __default_guardsize,
  34         };
  35         __release_ptc();
  36         return 0;
  37 }