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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5602 | serge | 1 | #ifndef __LBSYNC_H__ |
| 2 | #define __LBSYNC_H__ |
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| 3 | |||
| 6068 | serge | 4 | #define FUTEX_INIT 0 |
| 5 | #define FUTEX_DESTROY 1 |
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| 6 | #define FUTEX_WAIT 2 |
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| 7 | #define FUTEX_WAKE 3 |
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| 8 | |||
| 9 | #define exchange_acquire(ptr, new) \ |
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| 10 | __atomic_exchange_4((ptr), (new), __ATOMIC_ACQUIRE) |
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| 11 | |||
| 12 | #define exchange_release(ptr, new) \ |
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| 13 | __atomic_exchange_4((ptr), (new), __ATOMIC_RELEASE) |
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| 14 | |||
| 15 | |||
| 5602 | serge | 16 | typedef struct |
| 17 | { |
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| 18 | volatile int lock; |
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| 6068 | serge | 19 | int handle; |
| 5602 | serge | 20 | }mutex_t; |
| 21 | |||
| 6068 | serge | 22 | static inline int mutex_init(mutex_t *mutex) |
| 23 | { |
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| 24 | int handle; |
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| 5602 | serge | 25 | |
| 6068 | serge | 26 | mutex->lock = 0; |
| 27 | |||
| 28 | asm volatile( |
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| 29 | "int $0x40\t" |
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| 30 | :"=a"(handle) |
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| 31 | :"a"(77),"b"(FUTEX_INIT),"c"(mutex)); |
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| 32 | mutex->handle = handle; |
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| 33 | |||
| 34 | return handle; |
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| 35 | }; |
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| 36 | |||
| 37 | static inline int mutex_destroy(mutex_t *mutex) |
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| 38 | { |
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| 39 | int retval; |
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| 40 | |||
| 41 | asm volatile( |
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| 42 | "int $0x40\t" |
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| 43 | :"=a"(retval) |
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| 44 | :"a"(77),"b"(FUTEX_DESTROY),"c"(mutex->handle)); |
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| 45 | |||
| 46 | return retval; |
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| 47 | }; |
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| 48 | |||
| 49 | static inline void mutex_lock(mutex_t *mutex) |
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| 50 | { |
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| 51 | int tmp; |
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| 52 | |||
| 53 | if( __sync_fetch_and_add(&mutex->lock, 1) == 0) |
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| 54 | return; |
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| 55 | |||
| 56 | while (exchange_acquire (&mutex->lock, 2) != 0) |
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| 57 | { |
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| 58 | asm volatile( |
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| 59 | "int $0x40\t" |
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| 60 | :"=a"(tmp) |
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| 61 | :"a"(77),"b"(FUTEX_WAIT), |
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| 62 | "c"(mutex->handle),"d"(2),"S"(0)); |
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| 63 | } |
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| 64 | }; |
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| 65 | |||
| 66 | static inline void mutex_lock_timeout(mutex_t *mutex, int timeout) |
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| 67 | { |
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| 68 | int tmp; |
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| 69 | |||
| 70 | if( __sync_fetch_and_add(&mutex->lock, 1) == 0) |
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| 71 | return; |
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| 72 | |||
| 73 | while (exchange_acquire (&mutex->lock, 2) != 0) |
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| 74 | { |
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| 75 | asm volatile( |
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| 76 | "int $0x40\t" |
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| 77 | :"=a"(tmp) |
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| 78 | :"a"(77),"b"(FUTEX_WAIT), |
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| 79 | "c"(mutex->handle),"d"(2),"S"(timeout)); |
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| 80 | } |
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| 81 | }; |
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| 82 | |||
| 83 | static inline int mutex_trylock (mutex_t *mutex) |
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| 84 | { |
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| 85 | int zero = 0; |
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| 86 | |||
| 87 | return __atomic_compare_exchange_4(&mutex->lock, &zero, 1,0,__ATOMIC_ACQUIRE,__ATOMIC_RELAXED); |
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| 88 | }; |
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| 89 | |||
| 90 | static inline void mutex_unlock(mutex_t *mutex) |
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| 91 | { |
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| 92 | int prev; |
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| 93 | |||
| 94 | prev = exchange_release (&mutex->lock, 0); |
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| 95 | |||
| 96 | if (prev != 1) |
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| 97 | { |
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| 98 | asm volatile( |
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| 99 | "int $0x40\t" |
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| 100 | :"=a"(prev) |
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| 101 | :"a"(77),"b"(FUTEX_WAKE), |
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| 102 | "c"(mutex->handle),"d"(1)); |
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| 103 | }; |
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| 104 | }; |
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| 105 | |||
| 5602 | serge | 106 | #endif |