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spinlock: spin non atomically while waiting for lock to be released

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Matheus
2025-09-01 22:24:15 -03:00
parent a04a437fef
commit ca60b47209
1 changed files with 11 additions and 9 deletions
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kernel-src/include/spinlock.h
+11 -9
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@@ -10,25 +10,27 @@ typedef int spinlock_t;
#define SPINLOCK_INIT(x) x = SPINLOCK_INIT_VALUE #define SPINLOCK_INIT(x) x = SPINLOCK_INIT_VALUE
#define SPINLOCK_DEFINE(x) spinlock_t x = SPINLOCK_INIT_VALUE #define SPINLOCK_DEFINE(x) spinlock_t x = SPINLOCK_INIT_VALUE
static inline void spinlock_acquire(spinlock_t *lock){ static inline bool spinlock_try(spinlock_t *lock) {
while(!__sync_bool_compare_and_swap(lock, 0, 1)) asm("pause"); return __sync_bool_compare_and_swap(lock, 0, 1);
} }
static inline bool spinlock_acquire_irq_clear(spinlock_t *lock){ static inline void spinlock_acquire(spinlock_t *lock) {
while (!__sync_bool_compare_and_swap(lock, 0, 1)) {
while (*lock) asm volatile ("pause" : : : "memory");
}
}
static inline bool spinlock_acquire_irq_clear(spinlock_t *lock) {
bool ret = interrupt_set(false); bool ret = interrupt_set(false);
spinlock_acquire(lock); spinlock_acquire(lock);
return ret; return ret;
} }
static inline bool spinlock_try(spinlock_t *lock){ static inline void spinlock_release(spinlock_t *lock) {
return __sync_bool_compare_and_swap(lock, 0, 1);
}
static inline void spinlock_release(spinlock_t *lock){
*lock = 0; *lock = 0;
} }
static inline void spinlock_release_irq_restore(spinlock_t *lock, bool irqstate){ static inline void spinlock_release_irq_restore(spinlock_t *lock, bool irqstate) {
spinlock_release(lock); spinlock_release(lock);
interrupt_set(irqstate); interrupt_set(irqstate);
} }