projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d115c0d8 | 1 | /* Low-level functions for atomic operations. AM33 version. |
| d4697bc9 | 2 | Copyright 1999-2014 Free Software Foundation, Inc. |
| d115c0d8 AO |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Alexandre Oliva <aoliva@redhat.com>. | |
| 5 | Based on ../sparc/sparc32/atomicity.h | |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 8 | modify it under the terms of the GNU Library General Public License as | |
| 9 | published by the Free Software Foundation; either version 2 of the | |
| 10 | License, or (at your option) any later version. | |
| 11 | ||
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | Library General Public License for more details. | |
| 16 | ||
| 17 | You should have received a copy of the GNU Library General Public | |
| ab84e3ff PE |
18 | License along with the GNU C Library. If not, see |
| 19 | <http://www.gnu.org/licenses/>. */ | |
| d115c0d8 AO |
20 | |
| 21 | #ifndef _ATOMICITY_H | |
| 22 | #define _ATOMICITY_H 1 | |
| 23 | ||
| 24 | #include <inttypes.h> | |
| e054f494 | 25 | #include <stdint.h> |
| d115c0d8 AO |
26 | |
| 27 | #define __acquire_lock(lock) \ | |
| 28 | __asm__ __volatile__("1: bset %1, (%0)\n\t" \ | |
| 29 | " beq 1b" \ | |
| 30 | : : "a" (&(lock)), "d" (1) \ | |
| 31 | : "memory") | |
| 32 | ||
| 33 | #define __release_lock(lock) lock = 0 | |
| 34 | ||
| 35 | static int | |
| 36 | __attribute__ ((unused)) | |
| 37 | exchange_and_add (volatile uint32_t *mem, int val) | |
| 38 | { | |
| 39 | static unsigned char lock; | |
| 40 | int result; | |
| 41 | ||
| 42 | __acquire_lock (lock); | |
| 43 | ||
| 44 | result = *mem; | |
| 45 | *mem += val; | |
| 46 | ||
| 47 | __release_lock (lock); | |
| 48 | ||
| 49 | return result; | |
| 50 | } | |
| 51 | ||
| 52 | static void | |
| 53 | __attribute__ ((unused)) | |
| 54 | atomic_add (volatile uint32_t *mem, int val) | |
| 55 | { | |
| 56 | static unsigned char lock; | |
| 57 | ||
| 58 | __acquire_lock (lock); | |
| 59 | ||
| 60 | *mem += val; | |
| 61 | ||
| 62 | __release_lock (lock); | |
| 63 | } | |
| 64 | ||
| 65 | static int | |
| 66 | __attribute__ ((unused)) | |
| 67 | compare_and_swap (volatile long int *p, long int oldval, long int newval) | |
| 68 | { | |
| 69 | static unsigned char lock; | |
| 70 | int ret; | |
| 71 | ||
| 72 | __acquire_lock (lock); | |
| 73 | ||
| 74 | if (*p != oldval) | |
| 75 | ret = 0; | |
| 76 | else | |
| 77 | { | |
| 78 | *p = newval; | |
| 79 | ret = 1; | |
| 80 | } | |
| 81 | ||
| 82 | __release_lock (lock); | |
| 83 | ||
| 84 | return ret; | |
| 85 | } | |
| 86 | ||
| 87 | #endif /* atomicity.h */ |