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33 lines
531 B
Text
33 lines
531 B
Text
***********************************************
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typedef struct {
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int pre_count;
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int post_count;
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Mutex *lock;
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} RWLock;
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reader:
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retry:
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post = atomic_get (lock->post_count);
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... do read ...
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if (atomic_get (lock->pre_count) != post) {
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/* wait for writer to finish then retry */
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lock (lock->mutex);
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unlock (lock->mutex);
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goto retry;
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}
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writer:
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lock (lock->mutex);
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atomic_inc (lock->pre_count);
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... update ...
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atomic_inc (lock->post_count);
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unlock (lock->mutex);
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