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0f550417 | 1 | /* POSIX spinlock implementation. PowerPC version. |
9c7ff11a | 2 | Copyright (C) 2000, 2003 Free Software Foundation, Inc. |
0f550417 UD |
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 | |
cc7375ce RM |
6 | modify it under the terms of the GNU Lesser General Public License as |
7 | published by the Free Software Foundation; either version 2.1 of the | |
0f550417 UD |
8 | 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 | |
cc7375ce | 13 | Lesser General Public License for more details. |
0f550417 | 14 | |
cc7375ce | 15 | You should have received a copy of the GNU Lesser General Public |
0f550417 UD |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <pthread.h> | |
27ee0a55 | 22 | #include "internals.h" |
0f550417 UD |
23 | |
24 | int | |
25 | __pthread_spin_lock (pthread_spinlock_t *lock) | |
26 | { | |
2b72ebac GK |
27 | while (! __compare_and_swap ((long int *)lock, 0, 1)) |
28 | ; | |
29 | return 0; | |
0f550417 UD |
30 | } |
31 | weak_alias (__pthread_spin_lock, pthread_spin_lock) | |
32 | ||
33 | ||
34 | int | |
35 | __pthread_spin_trylock (pthread_spinlock_t *lock) | |
36 | { | |
2b72ebac | 37 | return __compare_and_swap ((long int *)lock, 0, 1) ? 0 : EBUSY; |
0f550417 UD |
38 | } |
39 | weak_alias (__pthread_spin_trylock, pthread_spin_trylock) | |
40 | ||
41 | ||
42 | int | |
43 | __pthread_spin_unlock (pthread_spinlock_t *lock) | |
44 | { | |
2b72ebac GK |
45 | MEMORY_BARRIER (); |
46 | *lock = 0; | |
47 | return 0; | |
0f550417 UD |
48 | } |
49 | weak_alias (__pthread_spin_unlock, pthread_spin_unlock) | |
50 | ||
51 | ||
52 | int | |
53 | __pthread_spin_init (pthread_spinlock_t *lock, int pshared) | |
54 | { | |
55 | /* We can ignore the `pshared' parameter. Since we are busy-waiting | |
56 | all processes which can access the memory location `lock' points | |
57 | to can use the spinlock. */ | |
9c7ff11a | 58 | *lock = 0; |
0f550417 UD |
59 | return 0; |
60 | } | |
61 | weak_alias (__pthread_spin_init, pthread_spin_init) | |
62 | ||
63 | ||
64 | int | |
65 | __pthread_spin_destroy (pthread_spinlock_t *lock) | |
66 | { | |
67 | /* Nothing to do. */ | |
68 | return 0; | |
69 | } | |
70 | weak_alias (__pthread_spin_destroy, pthread_spin_destroy) |