Add a simple Job queue in default port. (#1685)

Job queue (event loop) is the basis of Promise. Each port should implement their own job queue.

JerryScript-DCO-1.0-Signed-off-by: Zidong Jiang zidong.jiang@intel.com

jerry-core/jerry-port.h

@@ -17,6 +17,7 @@
 #define JERRY_PORT_H
 
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 
 #ifdef __cplusplus
@@ -139,6 +140,14 @@ bool jerry_port_get_time_zone (jerry_time_zone_t *tz_p);
  */
 double jerry_port_get_current_time (void);
 
+#ifndef CONFIG_DISABLE_ES2015_PROMISE_BUILTIN
+
+typedef uint32_t (*jerry_job_handler_t) (void *);
+
+void jerry_port_jobqueue_enqueue (jerry_job_handler_t handler, void *job_p);
+
+#endif /* !CONFIG_DISABLE_ES2015_PROMISE_BUILTIN */
+
 /**
  * @}
  */