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Diffstat (limited to 'kernel/trap.c')
-rw-r--r--kernel/trap.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/trap.c b/kernel/trap.c
index 75fb3ec..b879f01 100644
--- a/kernel/trap.c
+++ b/kernel/trap.c
@@ -53,7 +53,7 @@ usertrap(void)
if(r_scause() == 8){
// system call
- if(p->killed)
+ if(__sync_add_and_fetch(&p->killed, 0))
exit(-1);
// sepc points to the ecall instruction,
@@ -70,10 +70,10 @@ usertrap(void)
} else {
printf("usertrap(): unexpected scause %p pid=%d\n", r_scause(), p->pid);
printf(" sepc=%p stval=%p\n", r_sepc(), r_stval());
- p->killed = 1;
+ __sync_bool_compare_and_swap(&p->killed, 0, 1);
}
- if(p->killed)
+ if(__sync_add_and_fetch(&p->killed, 0))
exit(-1);
// give up the CPU if this is a timer interrupt.