| 1 | /* |
| 2 | * lttng/bitmap.h |
| 3 | * |
| 4 | * LTTng Bitmap API |
| 5 | * |
| 6 | * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 9 | * of this software and associated documentation files (the "Software"), to deal |
| 10 | * in the Software without restriction, including without limitation the rights |
| 11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 12 | * copies of the Software, and to permit persons to whom the Software is |
| 13 | * furnished to do so, subject to the following conditions: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 24 | * SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | #ifndef _LTTNG_BITMAP_H |
| 28 | #define _LTTNG_BITMAP_H |
| 29 | |
| 30 | #include <urcu/compiler.h> |
| 31 | #include <urcu/system.h> |
| 32 | #include <urcu/uatomic.h> |
| 33 | #include <stdbool.h> |
| 34 | |
| 35 | static inline void lttng_bitmap_index(unsigned int index, unsigned int *word, |
| 36 | unsigned int *bit) |
| 37 | { |
| 38 | *word = index / CAA_BITS_PER_LONG; |
| 39 | *bit = index % CAA_BITS_PER_LONG; |
| 40 | } |
| 41 | |
| 42 | static inline void lttng_bitmap_set_bit(unsigned int index, unsigned long *p) |
| 43 | { |
| 44 | unsigned int word, bit; |
| 45 | unsigned long val; |
| 46 | |
| 47 | lttng_bitmap_index(index, &word, &bit); |
| 48 | val = 1U << bit; |
| 49 | uatomic_or(p + word, val); |
| 50 | } |
| 51 | |
| 52 | static inline void lttng_bitmap_clear_bit(unsigned int index, unsigned long *p) |
| 53 | { |
| 54 | unsigned int word, bit; |
| 55 | unsigned long val; |
| 56 | |
| 57 | lttng_bitmap_index(index, &word, &bit); |
| 58 | val = ~(1U << bit); |
| 59 | uatomic_and(p + word, val); |
| 60 | } |
| 61 | |
| 62 | static inline bool lttng_bitmap_test_bit(unsigned int index, unsigned long *p) |
| 63 | { |
| 64 | unsigned int word, bit; |
| 65 | |
| 66 | lttng_bitmap_index(index, &word, &bit); |
| 67 | return (CMM_LOAD_SHARED(p[word]) >> bit) & 0x1; |
| 68 | } |
| 69 | |
| 70 | #endif /* _LTTNG_BITMAP_H */ |