Move the sleep function to jerry-port (#2245)

Now the jerry-debugger uses the jerry-port's sleep, therefore if there are systems that don't support
usleep or nanosleep can now define their own function.

JerryScript-DCO-1.0-Signed-off-by: Istvan Miklos imiklos2@inf.u-szeged.hu

docs/05.PORT-API.md

@@ -112,6 +112,15 @@ Allow user to provide external buffer for jerry instance (which includes an isol
 struct jerry_instance_t *jerry_port_get_current_instance (void);
 ```
 
+## Sleep
+
+```c
+/**
+ * Makes the process sleep for a given time.
+ */
+void jerry_port_sleep (uint32_t sleep_time);
+```
+
 # How to port JerryScript
 
 This section describes a basic port implementation which was created for Unix based systems.
@@ -231,3 +240,32 @@ jerry_port_get_current_instance (void)
   return current_instance_p;
 } /* jerry_port_get_current_instance */
 ```
+
+## Sleep
+
+```c
+#include "jerryscript-port.h"
+#include "jerryscript-port-default.h"
+
+#ifdef HAVE_TIME_H
+#include <time.h>
+#elif defined (HAVE_UNISTD_H)
+#include <unistd.h>
+#endif /* HAVE_TIME_H */
+
+#ifdef JERRY_DEBUGGER
+void jerry_port_sleep (uint32_t sleep_time)
+{
+#ifdef HAVE_TIME_H
+  nanosleep (&(const struct timespec)
+  {
+    sleep_time / 1000, (sleep_time % 1000) * 1000000L /* Seconds, nanoseconds */
+  }
+  , NULL);
+#elif defined (HAVE_UNISTD_H)
+  usleep ((useconds_t) sleep_time * 1000);
+#endif /* HAVE_TIME_H */
+  (void) sleep_time;
+} /* jerry_port_sleep */
+#endif /* JERRY_DEBUGGER */
+```