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Rev 2411 Rev 2464
Line 44... Line 44...
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 * @return Value after addition.
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 * @return Value after addition.
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 */
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 */
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static inline long atomic_add(atomic_t *val, int i)
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static inline long atomic_add(atomic_t *val, int i)
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{
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{
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    int ret;
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    int ret;
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    volatile long * mem = &(val->count);
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    volatile long *mem = &(val->count);
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    asm volatile (
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    asm volatile (
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        "1:                 \n"
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    "1:\n"
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        "ldr r2, [%1]       \n"
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        "ldr r2, [%1]       \n"
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        "add r3, r2, %2     \n"
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        "add r3, r2, %2     \n"
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        "str r3, %0         \n"
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        "str r3, %0         \n"
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        "swp r3, r3, [%1]   \n"
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        "swp r3, r3, [%1]   \n"
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        "cmp r3, r2         \n"
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        "cmp r3, r2         \n"
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    );
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    );
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    return ret;
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    return ret;
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}
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}
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 - 
 
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/** Atomic increment.
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/** Atomic increment.
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 *
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 *
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 * @param val Variable to be incremented.
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 * @param val Variable to be incremented.
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 */
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 */
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static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); }
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static inline void atomic_inc(atomic_t *val)
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{
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    atomic_add(val, 1);
- 
 
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}
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/** Atomic decrement.
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/** Atomic decrement.
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 *
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 *
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 * @param val Variable to be decremented.
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 * @param val Variable to be decremented.
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 */
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 */
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static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); }
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static inline void atomic_dec(atomic_t *val) {
- 
 
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    atomic_add(val, -1);
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}
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/** Atomic pre-increment.
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/** Atomic pre-increment.
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 *
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 *
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 * @param val Variable to be incremented.
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 * @param val Variable to be incremented.
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 * @return    Value after incrementation.
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 * @return    Value after incrementation.
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 */
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 */
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static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); }
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static inline long atomic_preinc(atomic_t *val)
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{
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    return atomic_add(val, 1);
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}
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/** Atomic pre-decrement.
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/** Atomic pre-decrement.
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 *
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 *
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 * @param val Variable to be decremented.
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 * @param val Variable to be decremented.
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 * @return    Value after decrementation.
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 * @return    Value after decrementation.
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 */
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 */
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static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); }
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static inline long atomic_predec(atomic_t *val)
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{
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    return atomic_add(val, -1);
- 
 
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}
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/** Atomic post-increment.
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/** Atomic post-increment.
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 *
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 *
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 * @param val Variable to be incremented.
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 * @param val Variable to be incremented.
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 * @return    Value before incrementation.
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 * @return    Value before incrementation.
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 */
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 */
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static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; }
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static inline long atomic_postinc(atomic_t *val)
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{
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    return atomic_add(val, 1) - 1;
- 
 
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}
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/** Atomic post-decrement.
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/** Atomic post-decrement.
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 *
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 *
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 * @param val Variable to be decremented.
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 * @param val Variable to be decremented.
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 * @return    Value before decrementation.
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 * @return    Value before decrementation.
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 */
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 */
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static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; }
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static inline long atomic_postdec(atomic_t *val)
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{
- 
 
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    return atomic_add(val, -1) + 1;
- 
 
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}
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#endif
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#endif
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/** @}
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/** @}
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 */
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 */