projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| ebabbf58 | 1 | /* |
| c0c0989a | 2 | * SPDX-License-Identifier: MIT |
| ebabbf58 MD |
3 | * |
| 4 | * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 5 | * | |
| c0c0989a | 6 | * LTTng Bitmap API |
| ebabbf58 MD |
7 | */ |
| 8 | ||
| 9 | #ifndef _LTTNG_BITMAP_H | |
| 10 | #define _LTTNG_BITMAP_H | |
| 11 | ||
| 12 | #include <urcu/compiler.h> | |
| 13 | #include <urcu/system.h> | |
| 14 | #include <urcu/uatomic.h> | |
| 15 | #include <stdbool.h> | |
| 16 | ||
| 17 | static inline void lttng_bitmap_index(unsigned int index, unsigned int *word, | |
| 18 | unsigned int *bit) | |
| 19 | { | |
| 20 | *word = index / CAA_BITS_PER_LONG; | |
| 21 | *bit = index % CAA_BITS_PER_LONG; | |
| 22 | } | |
| 23 | ||
| 24 | static inline void lttng_bitmap_set_bit(unsigned int index, unsigned long *p) | |
| 25 | { | |
| 26 | unsigned int word, bit; | |
| 27 | unsigned long val; | |
| 28 | ||
| 29 | lttng_bitmap_index(index, &word, &bit); | |
| 30 | val = 1U << bit; | |
| 31 | uatomic_or(p + word, val); | |
| 32 | } | |
| 33 | ||
| 34 | static inline void lttng_bitmap_clear_bit(unsigned int index, unsigned long *p) | |
| 35 | { | |
| 36 | unsigned int word, bit; | |
| 37 | unsigned long val; | |
| 38 | ||
| 39 | lttng_bitmap_index(index, &word, &bit); | |
| 40 | val = ~(1U << bit); | |
| 41 | uatomic_and(p + word, val); | |
| 42 | } | |
| 43 | ||
| 44 | static inline bool lttng_bitmap_test_bit(unsigned int index, unsigned long *p) | |
| 45 | { | |
| 46 | unsigned int word, bit; | |
| 47 | ||
| 48 | lttng_bitmap_index(index, &word, &bit); | |
| 49 | return (CMM_LOAD_SHARED(p[word]) >> bit) & 0x1; | |
| 50 | } | |
| 51 | ||
| 52 | #endif /* _LTTNG_BITMAP_H */ |