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0f550417 UD |
1 | /* POSIX spinlock implementation. SPARC64 version. |
2 | Copyright (C) 2000 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 | |
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 | 23 | |
554eca5c | 24 | /* This implementation is similar to the one used in the Linux kernel. */ |
0f550417 UD |
25 | int |
26 | __pthread_spin_lock (pthread_spinlock_t *lock) | |
27 | { | |
554eca5c AJ |
28 | asm volatile |
29 | ("1: ldstub [%0], %%g5\n" | |
30 | " brnz,pn %%g5, 2f\n" | |
31 | " membar #StoreLoad | #StoreStore\n" | |
32 | ".subsection 2\n" | |
33 | "2: ldub [%0], %%g5\n" | |
1dd54850 | 34 | " brnz,pt %%g5, 2b\n" |
554eca5c AJ |
35 | " membar #LoadLoad\n" |
36 | " b,a,pt %%xcc, 1b\n" | |
37 | ".previous" | |
38 | : /* no outputs */ | |
39 | : "r" (lock) | |
40 | : "g5", "memory"); | |
41 | return 0; | |
0f550417 UD |
42 | } |
43 | weak_alias (__pthread_spin_lock, pthread_spin_lock) | |
44 | ||
45 | ||
46 | int | |
47 | __pthread_spin_trylock (pthread_spinlock_t *lock) | |
48 | { | |
554eca5c AJ |
49 | int result; |
50 | asm volatile | |
51 | ("ldstub [%1], %0\n" | |
52 | "membar #StoreLoad | #StoreStore" | |
53 | : "=r" (result) | |
54 | : "r" (lock) | |
55 | : "memory"); | |
56 | return result == 0 ? 0 : EBUSY; | |
0f550417 UD |
57 | } |
58 | weak_alias (__pthread_spin_trylock, pthread_spin_trylock) | |
59 | ||
60 | ||
61 | int | |
62 | __pthread_spin_unlock (pthread_spinlock_t *lock) | |
63 | { | |
554eca5c AJ |
64 | asm volatile |
65 | ("membar #StoreStore | #LoadStore\n" | |
66 | "stb %%g0, [%0]" | |
67 | : | |
68 | : "r" (lock) | |
69 | : "memory"); | |
70 | return 0; | |
0f550417 UD |
71 | } |
72 | weak_alias (__pthread_spin_unlock, pthread_spin_unlock) | |
73 | ||
74 | ||
75 | int | |
76 | __pthread_spin_init (pthread_spinlock_t *lock, int pshared) | |
77 | { | |
78 | /* We can ignore the `pshared' parameter. Since we are busy-waiting | |
79 | all processes which can access the memory location `lock' points | |
80 | to can use the spinlock. */ | |
554eca5c | 81 | *lock = 0; |
0f550417 UD |
82 | return 0; |
83 | } | |
84 | weak_alias (__pthread_spin_init, pthread_spin_init) | |
85 | ||
86 | ||
87 | int | |
88 | __pthread_spin_destroy (pthread_spinlock_t *lock) | |
89 | { | |
90 | /* Nothing to do. */ | |
91 | return 0; | |
92 | } | |
93 | weak_alias (__pthread_spin_destroy, pthread_spin_destroy) |