1 files changed, 74 insertions, 0 deletions
diff --git a/libchill/waituntil.c b/libchill/waituntil.c
new file mode 100644
index 00000000000..dfe57be8a64
--- /dev/null
+++ b/libchill/waituntil.c
@@ -0,0 +1,74 @@
+/* Implement timing-related runtime actions for CHILL.
+   Copyright (C) 1992,1993 Free Software Foundation, Inc.
+   Author: Wilfried Moser
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "rtltypes.h"
+#include "rts.h"
+
+EXCEPTION (timerfail);
+
+/*
+ * function __wait_until
+ *
+ * parameters:
+ *     abstime   absolute time value
+ *     filename
+ *     linenumber
+ *
+ * returns:
+ *     int   0 on success, 1 on failure
+ *
+ * exceptions:
+ *     timerfail
+ *
+ * abstract:
+ *     check for given argument is valid, calculate how long to wait in
+ *     seconds and call os to do it.
+ *
+ */
+
+int
+__wait_until (abstime, filename, linenumber)
+     unsigned long  abstime;
+     char          *filename;
+     int            linenumber;
+{
+  RtsTime	now, delta, abs_rtstime;
+    
+  /* get current time */
+  __rtstime (&now);
+    
+  abs_rtstime.secs = abstime;
+  abs_rtstime.nanosecs = 0;
+  
+  if (abs_rtstime.nanosecs < now.nanosecs)
+    {
+      abs_rtstime.secs--;
+      abs_rtstime.nanosecs += 1000000000;
+    }
+  
+  delta.secs = abs_rtstime.secs - now.secs;
+  delta.nanosecs = abs_rtstime.nanosecs - now.nanosecs;
+  
+  if (delta.secs > abs_rtstime.secs)
+    /* cannot wait into past */
+    return 1;
+  
+  return __delay_this (wait_wait, &delta, filename, linenumber) == 1 ? 0 : 1;
+}