added required for input files

src/main.py

@@ -28,10 +28,10 @@ def write_main(args):
                       )
 def main():
     parser = argparse.ArgumentParser(description="Generate a cu file that impelement the schedule graph generated by GPUSCHED")
-    parser.add_argument('-t', '--gpu_tasks', type=str, help='Input file containing GPU Tasks information')
-    parser.add_argument('-j', '--gpu_jobs',  type=str, help='Input file containing GPU Jobs information')
-    parser.add_argument('-s', '--schedule',  type=str, help='Input file containing the GPUSCHED schedule output')
-    parser.add_argument('-k', '--kernel_declaration', type=str, help='Input file containing cuda kernel declaration')
+    parser.add_argument('-t', '--gpu_tasks', type=str, help='Input file containing GPU Tasks information', required=True)
+    parser.add_argument('-j', '--gpu_jobs',  type=str, help='Input file containing GPU Jobs information', required=True)
+    parser.add_argument('-s', '--schedule',  type=str, help='Input file containing the GPUSCHED schedule output', required=True)
+    parser.add_argument('-k', '--kernel_declaration', type=str, help='Input file containing cuda kernel declaration', required=True)
 
     parser.add_argument('-o', '--output_file', type=str, default='gpusched_impl.cu', help='Output file containing the implementation of GPUSCHED')
     parser.add_argument('-v', '--version', action='version', version='%(prog)s 0.1')