projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 76a50749 UD |
1 | /* Copyright (C) 2002 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
| 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, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 19 | ||
| 20 | #ifndef _ATOMIC_H | |
| 21 | #define _ATOMIC_H 1 | |
| 22 | ||
| 23 | #include <stdlib.h> | |
| 24 | ||
| 25 | #include <bits/atomic.h> | |
| 26 | ||
| 27 | ||
| 28 | #ifndef atomic_compare_and_exchange_acq | |
| 29 | # define atomic_compare_and_exchange_acq(mem, newval, oldval) \ | |
| 30 | ({ __typeof (__arch_compare_and_exchange_8_acq (mem, newval, oldval)) \ | |
| 31 | __result; \ | |
| 32 | if (sizeof (*mem) == 1) \ | |
| 33 | __result = __arch_compare_and_exchange_8_acq (mem, newval, oldval); \ | |
| 34 | else if (sizeof (*mem) == 2) \ | |
| 35 | __result = __arch_compare_and_exchange_16_acq (mem, newval, oldval); \ | |
| 36 | else if (sizeof (*mem) == 4) \ | |
| 37 | __result = __arch_compare_and_exchange_32_acq (mem, newval, oldval); \ | |
| 38 | else if (sizeof (*mem) == 8) \ | |
| 39 | __result = __arch_compare_and_exchange_64_acq (mem, newval, oldval); \ | |
| 40 | else \ | |
| 41 | abort (); \ | |
| 42 | __result; }) | |
| 43 | #endif | |
| 44 | ||
| 45 | ||
| 46 | #ifndef atomic_compare_and_exchange_rel | |
| 47 | # define atomic_compare_and_exchange_rel(mem, oldval, newval) \ | |
| 48 | compare_and_exchange_acq (mem, oldval, newval) | |
| 49 | #endif | |
| 50 | ||
| 51 | ||
| 52 | #ifndef atomic_exchange_and_add | |
| 53 | # define atomic_exchange_and_add(mem, value) \ | |
| 54 | ({ __typeof (*mem) __oldval; \ | |
| 55 | __typeof (mem) __memp = (mem); \ | |
| 56 | __typeof (*mem) __value = (value); \ | |
| 57 | \ | |
| 58 | do \ | |
| 59 | __oldval = (*__memp); \ | |
| 60 | while (compare_and_exchange_acq (__memp, __oldval + __value, __oldval)); \ | |
| 61 | \ | |
| 62 | __value; }) | |
| 63 | #endif | |
| 64 | ||
| 65 | ||
| 66 | #ifndef atomic_add | |
| 67 | # define atomic_add(mem, value) (void) exchange_and_add (mem, value) | |
| 68 | #endif | |
| 69 | ||
| 70 | ||
| 71 | #ifndef atomic_increment | |
| 72 | # define atomic_increment(mem) atomic_add (mem, 1) | |
| 73 | #endif | |
| 74 | ||
| 75 | ||
| 76 | #ifndef atomic_decrement | |
| 77 | # define atomic_decrement(mem) atomic_add (mem, -1) | |
| 78 | #endif | |
| 79 | ||
| 80 | ||
| 81 | #ifndef atomic_set_bit | |
| 82 | # define atomic_set_bit(mem, bit) \ | |
| 83 | (void) ({ __typeof (mem) __memp = (mem); \ | |
| 84 | while (1) \ | |
| 85 | { \ | |
| 86 | __typeof (*mem) __oldval = *__memp; \ | |
| 87 | \ | |
| 88 | if (compare_and_exchange_acq (__memp, __oldval | 1 << bit, \ | |
| 89 | __oldval) == 0) \ | |
| 90 | break; \ | |
| 91 | }}) | |
| 92 | #endif | |
| 93 | ||
| 94 | ||
| 95 | #ifndef atomic_full_barrier | |
| 96 | # define full_barrier() __asm ("" ::: "memory") | |
| 97 | #endif | |
| 98 | ||
| 99 | ||
| 100 | #ifndef atomic_read_barrier | |
| 101 | # define read_barrier() full_barrier() | |
| 102 | #endif | |
| 103 | ||
| 104 | ||
| 105 | #ifndef atomic_write_barrier | |
| 106 | # define write_barrier() full_barrier() | |
| 107 | #endif | |
| 108 | ||
| 109 | #endif /* atomic.h */ |