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42 lines
681 B
42 lines
681 B
#ifndef __USER_LIBS_LOCK_H__
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#define __USER_LIBS_LOCK_H__
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#include <defs.h>
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#include <atomic.h>
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#include <ulib.h>
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#define INIT_LOCK {0}
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typedef volatile bool lock_t;
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static inline void
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lock_init(lock_t *l) {
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*l = 0;
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}
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static inline bool
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try_lock(lock_t *l) {
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return test_and_set_bit(0, l);
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}
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static inline void
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lock(lock_t *l) {
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if (try_lock(l)) {
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int step = 0;
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do {
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yield();
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if (++ step == 100) {
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step = 0;
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sleep(10);
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}
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} while (try_lock(l));
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}
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}
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static inline void
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unlock(lock_t *l) {
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test_and_clear_bit(0, l);
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}
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#endif /* !__USER_LIBS_LOCK_H__ */
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