about summary refs log tree commit diff
path: root/nptl/sysdeps/unix/sysv/linux/rtld-lowlevel.h
blob: 75e96707865939e709e1dd32a75f70cc0ce5ac10 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
/* Defintions for lowlevel handling in ld.so.
   Copyright (C) 2006-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _RTLD_LOWLEVEL_H
#define  _RTLD_LOWLEVEL_H 1

#include <atomic.h>
#include <lowlevellock.h>


/* Function to wait for variable become zero.  Used in ld.so for
   reference counters.  */
#define __rtld_waitzero(word) \
  do {									      \
    while (1)								      \
      {									      \
	int val = word;							      \
	if (val == 0)							      \
	  break;							      \
	lll_futex_wait (&(word), val, LLL_PRIVATE);			      \
      }									      \
  } while (0)


#define __rtld_notify(word) \
  lll_futex_wake (&(word), 1, LLL_PRIVATE)

#endif