1 /* S390 internal mutex struct definitions.
2    Copyright (C) 2019-2022 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <http://www.gnu.org/licenses/>.  */
18 
19 #ifndef _THREAD_MUTEX_INTERNAL_H
20 #define _THREAD_MUTEX_INTERNAL_H 1
21 
22 struct __pthread_mutex_s
23 {
24   int __lock;
25   unsigned int __count;
26   int __owner;
27 #if __WORDSIZE == 64
28   unsigned int __nusers;
29 #endif
30   /* KIND must stay at this position in the structure to maintain
31      binary compatibility with static initializers.  */
32   int __kind;
33 #if __WORDSIZE == 64
34   short __spins;
35   short __elision;
36   __pthread_list_t __list;
37 # define __PTHREAD_MUTEX_HAVE_PREV      1
38 #else
39   unsigned int __nusers;
40   __extension__ union
41   {
42     struct
43     {
44       short __espins;
45       short __elision;
46     } _d;
47 #  define __spins _d.__espins
48 #  define __elision _d.__elision
49     __pthread_slist_t __list;
50   };
51 # define __PTHREAD_MUTEX_HAVE_PREV      0
52 #endif
53 };
54 
55 #if __WORDSIZE == 64
56 # define __PTHREAD_MUTEX_INITIALIZER(__kind) \
57   0, 0, 0, 0, __kind, 0, 0, { 0, 0 }
58 #else
59 # define __PTHREAD_MUTEX_INITIALIZER(__kind) \
60   0, 0, 0, __kind, 0, { { 0, 0 } }
61 #endif
62 
63 #endif
64