diff --git a/kernel/hal/hal.h b/kernel/hal/hal.h
index 2fe9749..62f243f 100644
--- a/kernel/hal/hal.h
+++ b/kernel/hal/hal.h
@@ -19,6 +19,7 @@ size_t hal_strspn(const char *s, const char *accept);
 char *hal_strcpy(char *dest, const char *src);
 char *hal_strchr(const char *s, int c);
 void hal_init_withmalloc(void);
+void hal_wait(uint32_t ms);
 
 #if defined(__x86_64__)
 # define HAL_PAGE_SIZE 0x1000
diff --git a/kernel/hal/x86_64/hal.c b/kernel/hal/x86_64/hal.c
index fdbf571..76503a0 100644
--- a/kernel/hal/x86_64/hal.c
+++ b/kernel/hal/x86_64/hal.c
@@ -34,3 +34,7 @@ void hal_init_withmalloc(void) {
   hal_intr_disable();
 }
 
+void hal_wait(uint32_t ms) {
+  pit_wait(ms);
+}
+
diff --git a/kernel/proc/proc.c b/kernel/proc/proc.c
index 3a16f1d..b6b3f99 100644
--- a/kernel/proc/proc.c
+++ b/kernel/proc/proc.c
@@ -11,6 +11,12 @@
 
 #define PROC_REAPER_FREQ 30
 
+#define PROC_DIE() \
+  do { \
+    proc_killself(); \
+    for(;;); \
+  } while(0)
+
 uint64_t pids = 0;
 uint64_t sched_ticks = 0;
 
@@ -114,13 +120,11 @@ int a = 0;
 
 void proc_print(void) {
   for (;;) {
-    for (volatile size_t i = 0; i < 0x1000000; i++) {
-    }
+    hal_wait(1 * 1000);
     
-    if (a == 10) {
-      proc_killself();
-      for(;;);
-    }
+    /* if (a == 10) { */
+    /*   PROC_DIE(); */
+    /* } */
     kprintf("A");
     a++;
   }
@@ -130,13 +134,11 @@ int b = 0;
 
 void proc_print2(void) {
   for (;;) {
-    for (volatile size_t i = 0; i < 0x1000000; i++) {
-    }
+    hal_wait(2 * 1000);
     
-    if (b == 20) {
-      proc_killself();
-      for(;;);
-    }
+    /* if (b == 20) { */
+    /*   PROC_DIE(); */
+    /* } */
     kprintf("B");
     b++;
   }