disable interrupts when holding kernel lock

1 files changed, 3 insertions, 0 deletions

diff --git a/spinlock.c b/spinlock.c
index 911ecf8..5cbe062 100644
--- a/spinlock.c
+++ b/spinlock.c
@@ -14,6 +14,8 @@ acquire_spinlock(uint32_t* lock)
 
   if (*lock == cpu_id)
     return;
+  
+  lapic_disableintr();
   while ( cmpxchg(LOCK_FREE, cpu_id, lock) != cpu_id ) { ; }
   // cprintf ("acquired: %d\n", cpu_id);
 }
@@ -26,6 +28,7 @@ release_spinlock(uint32_t* lock)
   if (*lock != cpu_id)
     panic("release_spinlock: releasing a lock that i don't own\n");
   *lock = LOCK_FREE;
+  lapic_enableintr();
 }
 
 void