| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | cat << EOF |
| 2 | /** |
| 3 | * ${atomic}_fetch_add_unless - add unless the number is already a given value |
| 4 | * @v: pointer of type ${atomic}_t |
| 5 | * @a: the amount to add to v... |
| 6 | * @u: ...unless v is equal to u. |
| 7 | * |
| 8 | * Atomically adds @a to @v, so long as @v was not already @u. |
| 9 | * Returns original value of @v |
| 10 | */ |
| 11 | static inline ${int} |
| 12 | ${atomic}_fetch_add_unless(${atomic}_t *v, ${int} a, ${int} u) |
| 13 | { |
| 14 | ${int} c = ${atomic}_read(v); |
| 15 | |
| 16 | do { |
| 17 | if (unlikely(c == u)) |
| 18 | break; |
| 19 | } while (!${atomic}_try_cmpxchg(v, &c, c + a)); |
| 20 | |
| 21 | return c; |
| 22 | } |
| 23 | EOF |