used new sleep

Author: dileping

ExecutionContext/CustomExecutionContext.swift

@@ -28,12 +28,8 @@ public class CustomExecutionContext : ExecutionContextBase, ExecutionContextType
     }
 
     public func async(after:Double, task:SafeTask) {
-        let sec = time_t(after)
-        let nsec = Int((after - Double(sec)) * 1000 * 1000 * 1000)//nano seconds
-        var time = timespec(tv_sec:sec, tv_nsec: nsec)
-        
         async {
-            nanosleep(&time, nil)
+            sleep(after)
             task()
         }
     }

ExecutionContext/ImmediateExecutionContext.swift

@@ -22,12 +22,10 @@ public class ImmediateExecutionContext : ExecutionContextBase, ExecutionContextT
     }
 
     public func async(after:Double, task:SafeTask) {
-        let sec = time_t(after)
-        let nsec = Int((after - Double(sec)) * 1000 * 1000 * 1000)//nano seconds
-        var time = timespec(tv_sec:sec, tv_nsec: nsec)
-        
-        nanosleep(&time, nil)
-        async(task)
+        async {
+            sleep(after)
+            task()
+        }
     }
 
     public func sync<ReturnType>(task:() throws -> ReturnType) throws -> ReturnType {

ExecutionContext/PThreadExecutionContext.swift

@@ -196,11 +196,7 @@
 
         func async(after:Double, task:SafeTask) {
             let thread = PThread(task: {
-                let sec = time_t(after)
-                let nsec = Int((after - Double(sec)) * 1000 * 1000 * 1000)//nano seconds
-                var time = timespec(tv_sec:sec, tv_nsec: nsec)
-                
-                nanosleep(&time, nil)
+                sleep(after)
                 task()
             })
             thread.start()