Fixed an integer promotion issue

Synaction/Synaction.m

@@ -96,7 +96,7 @@ - (uint64_t)currentNetworkTime {// https://developer.apple.com/library/content/q
   }
 
   uint64_t timeNanoSeconds = baseTime * sTimebaseInfo.numer / sTimebaseInfo.denom;
-  return timeNanoSeconds - self.hostTimeOffset;
+  return (int64_t)timeNanoSeconds - self.hostTimeOffset;
 }
 
 - (void)atExactTime:(uint64_t)val runBlock:(dispatch_block_t _Nonnull)block {
@@ -108,8 +108,8 @@ - (void)atExactTime:(uint64_t)val runBlock:(dispatch_block_t _Nonnull)block {
   dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, DISPATCH_TIMER_STRICT, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0));
   dispatch_source_set_event_handler(timer, ^{
     dispatch_source_cancel(timer); // one shot timer
-    while (val > [self currentNetworkTime]) {
-      [NSThread sleepForTimeInterval:0];
+    while (val > [self currentNetworkTime]+(uint64_t)1) {
+      sleep(0);
     }
     block();
   });
@@ -162,8 +162,8 @@ - (void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCP
     //uint64_t latencyWithHost = ([self currentNetworkTime] - timePingSent)/2;// Calculates the estimated latency for one way travel
 
     int64_t calculatedOffset = ((int64_t)[self currentNetworkTime] + (int64_t)timePingSent - (2*(int64_t)timeHostReceivedPing))/2; // WAY 1. Best because it doesn't depend on latency
-    //calculatedOffset2 = latencyWithHost - timeHostReceivedPing + timePingSent;// WAY 2
-    //calculatedOffset3 = -latencyWithHost - timeHostReceivedPing + [self currentNetworkTime];// WAY 3
+    //calculatedOffset2 = (int64_t)latencyWithHost - (int64_t)timeHostReceivedPing + (int64_t)timePingSent;// WAY 2
+    //calculatedOffset3 = -(int64_t)latencyWithHost - (int64_t)timeHostReceivedPing + (int64_t)[self currentNetworkTime];// WAY 3
 
     [calculatedOffsets addObject:[NSNumber numberWithLongLong:calculatedOffset]];