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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef __TOOLS_ASM_GENERIC_ATOMIC_H |
| 3 | #define __TOOLS_ASM_GENERIC_ATOMIC_H |
| 4 | |
| 5 | #include <linux/compiler.h> |
| 6 | #include <linux/types.h> |
| 7 | #include <linux/bitops.h> |
| 8 | |
| 9 | /* |
| 10 | * Atomic operations that C can't guarantee us. Useful for |
| 11 | * resource counting etc.. |
| 12 | * |
| 13 | * Excerpts obtained from the Linux kernel sources. |
| 14 | */ |
| 15 | |
| 16 | #define ATOMIC_INIT(i) { (i) } |
| 17 | |
| 18 | /** |
| 19 | * atomic_read - read atomic variable |
| 20 | * @v: pointer of type atomic_t |
| 21 | * |
| 22 | * Atomically reads the value of @v. |
| 23 | */ |
| 24 | static inline int atomic_read(const atomic_t *v) |
| 25 | { |
| 26 | return READ_ONCE((v)->counter); |
| 27 | } |
| 28 | |
| 29 | /** |
| 30 | * atomic_set - set atomic variable |
| 31 | * @v: pointer of type atomic_t |
| 32 | * @i: required value |
| 33 | * |
| 34 | * Atomically sets the value of @v to @i. |
| 35 | */ |
| 36 | static inline void atomic_set(atomic_t *v, int i) |
| 37 | { |
| 38 | v->counter = i; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * atomic_inc - increment atomic variable |
| 43 | * @v: pointer of type atomic_t |
| 44 | * |
| 45 | * Atomically increments @v by 1. |
| 46 | */ |
| 47 | static inline void atomic_inc(atomic_t *v) |
| 48 | { |
| 49 | __sync_add_and_fetch(&v->counter, 1); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * atomic_dec_and_test - decrement and test |
| 54 | * @v: pointer of type atomic_t |
| 55 | * |
| 56 | * Atomically decrements @v by 1 and |
| 57 | * returns true if the result is 0, or false for all other |
| 58 | * cases. |
| 59 | */ |
| 60 | static inline int atomic_dec_and_test(atomic_t *v) |
| 61 | { |
| 62 | return __sync_sub_and_fetch(&v->counter, 1) == 0; |
| 63 | } |
| 64 | |
| 65 | #define cmpxchg(ptr, oldval, newval) \ |
| 66 | __sync_val_compare_and_swap(ptr, oldval, newval) |
| 67 | |
| 68 | static inline int atomic_cmpxchg(atomic_t *v, int oldval, int newval) |
| 69 | { |
| 70 | return cmpxchg(&(v)->counter, oldval, newval); |
| 71 | } |
| 72 | |
| 73 | static inline int test_and_set_bit(long nr, unsigned long *addr) |
| 74 | { |
| 75 | unsigned long mask = BIT_MASK(nr); |
| 76 | long old; |
| 77 | |
| 78 | addr += BIT_WORD(nr); |
| 79 | |
| 80 | old = __sync_fetch_and_or(addr, mask); |
| 81 | return !!(old & mask); |
| 82 | } |
| 83 | |
| 84 | static inline int test_and_clear_bit(long nr, unsigned long *addr) |
| 85 | { |
| 86 | unsigned long mask = BIT_MASK(nr); |
| 87 | long old; |
| 88 | |
| 89 | addr += BIT_WORD(nr); |
| 90 | |
| 91 | old = __sync_fetch_and_and(addr, ~mask); |
| 92 | return !!(old & mask); |
| 93 | } |
| 94 | |
| 95 | #endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */ |
| 96 |
Warning: That file was not part of the compilation database. It may have many parsing errors.