greg/xv6
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

disable interrupts when holding kernel lock

Browse source
This commit is contained in:
kaashoek 2006-06-28 16:44:41 +00:00
parent bd303ed060
commit f7cea12b38
3 changed files with 10 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
defs.h
View file

@ -41,6 +41,7 @@ void lapic_init(int);
void lapic_timerinit(void);
void lapic_timerintr(void);
void lapic_enableintr(void);
void lapic_disableintr(void);
// spinlock.c
extern uint32_t kernel_lock;

6
mp.c
View file

@ -183,6 +183,12 @@ lapic_enableintr(void)
lapic_write(LAPIC_TPR, 0);
}
void
lapic_disableintr(void)
{
lapic_write(LAPIC_TPR, 0xFF);
}
int
cpu(void)
{

3
spinlock.c
View file

@ -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