From c63f340d90800895f007de64b7d2d14624263331 Mon Sep 17 00:00:00 2001 From: nthnluu Date: Sun, 28 Jan 2024 21:20:27 -0500 Subject: Created student weenix repository --- kernel/proc/spinlock.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 kernel/proc/spinlock.c (limited to 'kernel/proc/spinlock.c') diff --git a/kernel/proc/spinlock.c b/kernel/proc/spinlock.c new file mode 100644 index 0000000..bf89b8e --- /dev/null +++ b/kernel/proc/spinlock.c @@ -0,0 +1,21 @@ +#include "globals.h" +#include "main/apic.h" + +void spinlock_init(spinlock_t *lock) { lock->s_locked = 0; } + +inline void spinlock_lock(spinlock_t *lock) +{ +// __sync_bool_compare_and_swap is a GCC intrinsic for atomic compare-and-swap +// If lock->locked is 0, then it is set to 1 and __sync_bool_compare_and_swap +// returns true Otherwise, lock->locked is left at 1 and +// __sync_bool_compare_and_swap returns false +} + +inline void spinlock_unlock(spinlock_t *lock) +{ +} + +inline long spinlock_ownslock(spinlock_t *lock) +{ + return 1; +} -- cgit v1.2.3-70-g09d2