X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=src%2Fdos%2Ftimer.c;h=d6c3b520cf600c2cd0caf795ae50b9ecbbacdb46;hp=dcf790cfc0b494e11c9fe6f6ec13605e6252d3ee;hb=7cffbf057545fb303ad8f53e432ef42f7708e16d;hpb=68f89fa06ae5cfacde9cf8310e97220e5fc05260

diff --git a/src/dos/timer.c b/src/dos/timer.c
index dcf790c..d6c3b52 100644
--- a/src/dos/timer.c
+++ b/src/dos/timer.c
@@ -16,6 +16,7 @@
 
 #include "pit8254.h"
 #include "inttypes.h"
+#include "util.h"
 
 #define PIT_TIMER_INTR	8
 #define DOS_TIMER_INTR	0x1c
@@ -45,7 +46,7 @@ static _go32_dpmi_seginfo intr, prev_intr;
 
 static void INTERRUPT timer_irq();
 
-static unsigned long ticks;
+static volatile unsigned long ticks;
 static unsigned long tick_interval, ticks_per_dos_intr;
 static int inum;
 
@@ -123,6 +124,16 @@ unsigned long get_msec(void)
 	return ticks * tick_interval;
 }
 
+void sleep_msec(unsigned long msec)
+{
+	unsigned long wakeup_time = ticks + msec / tick_interval;
+	while(ticks < wakeup_time) {
+#ifdef USE_HLT
+		halt();
+#endif
+	}
+}
+
 static void set_timer_reload(int reload_val)
 {
 	outp(PORT_CMD, CMD_CHAN0 | CMD_ACCESS_BOTH | CMD_OP_SQWAVE);