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1 | #include "spinlock.h" |
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2 | |
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3 | int atomic_read(const atomic_t *v){ |
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4 | return v->val; |
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5 | } |
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6 | |
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7 | int atomic_dec_and_test(atomic_t *v){ |
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8 | if(v->val > 0){ |
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9 | v->val--; |
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10 | return v->val == 0; |
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11 | } |
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12 | return 0; |
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13 | } |
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14 | |
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15 | void atomic_inc(atomic_t *v){ |
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16 | v->val++; |
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17 | } |
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18 | |
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19 | void atomic_set(atomic_t *v, int x){ |
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20 | v->val = x; |
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21 | } |
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22 | |
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23 | void spin_lock_init(spinlock_t *lock){ |
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24 | *lock = (spinlock_t){}; |
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25 | } |
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26 | |
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27 | unsigned long _spin_lock_irqsave(spinlock_t *lock){ |
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28 | lock->val++; |
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29 | return 0; |
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30 | } |
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31 | |
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32 | void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags){ |
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33 | lock->val--; |
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34 | } |
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35 | |
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36 | unsigned long _read_lock_irqsave(rwlock_t *lock){ |
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37 | lock->val++; |
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38 | return 0; |
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39 | } |
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40 | |
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41 | void read_unlock_irqrestore(rwlock_t *lock, unsigned long flags){ |
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42 | lock->val--; |
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43 | } |
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44 | |
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45 | unsigned long _write_lock_irqsave(rwlock_t *lock){ |
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46 | lock->val++; |
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47 | return 0; |
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48 | } |
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49 | |
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50 | void write_unlock_irqrestore(rwlock_t *lock, unsigned long flags){ |
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51 | lock->val--; |
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52 | } |
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53 | |
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54 | void init_MUTEX(struct semaphore *sem){ |
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55 | *sem = (struct semaphore){ .count = 1 }; |
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56 | } |
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57 | |
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58 | void down(struct semaphore *sem){ |
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59 | sem->count--; |
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60 | } |
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61 | |
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62 | void up(struct semaphore *sem){ |
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63 | sem->count++; |
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64 | } |
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65 | |
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