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Commit | Line | Data |
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1bd2c9ed BP |
1 | /* This header implements atomic operation locking helpers. */ |
2 | #ifndef IN_OVS_ATOMIC_H | |
3 | #error "This header should only be included indirectly via ovs-atomic.h." | |
4 | #endif | |
5 | ||
6 | #define OVS_ATOMIC_LOCKED_IMPL 1 | |
7 | ||
8 | void atomic_lock__(void *); | |
9 | void atomic_unlock__(void *); | |
10 | ||
11 | #define atomic_store_locked(DST, SRC) \ | |
12 | (atomic_lock__(DST), \ | |
13 | *(DST) = (SRC), \ | |
14 | atomic_unlock__(DST), \ | |
15 | (void) 0) | |
16 | ||
17 | #define atomic_read_locked(SRC, DST) \ | |
18 | (atomic_lock__(SRC), \ | |
19 | *(DST) = *(SRC), \ | |
20 | atomic_unlock__(SRC), \ | |
21 | (void) 0) | |
22 | ||
25045d75 JR |
23 | /* XXX: Evaluates EXP multiple times. */ |
24 | #define atomic_compare_exchange_locked(DST, EXP, SRC) \ | |
25 | (atomic_lock__(DST), \ | |
26 | (*(DST) == *(EXP) \ | |
27 | ? (*(DST) = (SRC), \ | |
28 | atomic_unlock__(DST), \ | |
29 | true) \ | |
30 | : (*(EXP) = *(DST), \ | |
31 | atomic_unlock__(DST), \ | |
32 | false))) | |
33 | ||
1bd2c9ed BP |
34 | #define atomic_op_locked_add += |
35 | #define atomic_op_locked_sub -= | |
36 | #define atomic_op_locked_or |= | |
37 | #define atomic_op_locked_xor ^= | |
38 | #define atomic_op_locked_and &= | |
39 | #define atomic_op_locked(RMW, OP, OPERAND, ORIG) \ | |
40 | (atomic_lock__(RMW), \ | |
41 | *(ORIG) = *(RMW), \ | |
42 | *(RMW) atomic_op_locked_##OP (OPERAND), \ | |
43 | atomic_unlock__(RMW)) |