From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/erl_interface/src/legacy/erl_timeout.c | 161 +++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 lib/erl_interface/src/legacy/erl_timeout.c

(limited to 'lib/erl_interface/src/legacy/erl_timeout.c')

diff --git a/lib/erl_interface/src/legacy/erl_timeout.c b/lib/erl_interface/src/legacy/erl_timeout.c
new file mode 100644
index 0000000000..af1a4a1f3a
--- /dev/null
+++ b/lib/erl_interface/src/legacy/erl_timeout.c
@@ -0,0 +1,161 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 1997-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+/* timeout.c 
+ * 
+ * todo: use posix timers (timer_create etc) instead of setitimer.
+ * 
+ */
+#if !defined(__WIN32__) && !defined(VXWORKS)
+
+/* FIXME: well, at least I can compile now... */
+
+#include "eidef.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <signal.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
+
+#include "erl_timeout.h"
+
+typedef struct jmp_s {
+  jmp_buf jmpbuf;
+  struct itimerval timerinfo;
+  void *siginfo;
+  struct jmp_s *next;
+} *jmp_t;
+
+static jmp_t push(jmp_t j);
+static jmp_t pop(void);
+static void timeout_handler(int dummy);
+
+jmp_buf *timeout_setup(int ms)
+{
+  struct itimerval t;
+  jmp_t j;
+  void *s;
+
+#ifdef DEBUG
+  fprintf(stderr,"timeout setup\n");
+#endif
+  s=signal(SIGALRM,timeout_handler);
+
+  /* set the timer */
+  t.it_interval.tv_sec = 0;
+  t.it_interval.tv_usec = 0;
+  t.it_value.tv_sec = ms / 1000;
+  t.it_value.tv_usec = (ms % 1000) * 1000;
+
+  /* get a jump buffer and save it */
+  j = malloc(sizeof(*j));	/* FIXME check result */
+  j->siginfo = s;
+  push(j);
+
+  setitimer(ITIMER_REAL,&t,&(j->timerinfo));
+
+  return &(j->jmpbuf);
+}
+
+
+int timeout_cancel(void)
+{
+  jmp_t j;
+
+#ifdef DEBUG
+  fprintf(stderr,"timeout cancel\n");
+#endif
+  /* retrieve the jump buffer */
+  j=pop();
+  /* restore the timer and signal disposition */
+  setitimer(ITIMER_REAL,&(j->timerinfo),NULL);
+  signal(SIGALRM,j->siginfo);
+
+  free(j);
+
+  return 0;
+}
+
+void timeout_handler(int dummy)
+{
+  jmp_t j;
+
+#ifdef DEBUG
+  fprintf(stderr,"timeout handler\n");
+#endif
+
+  /* retrieve the jump buffer */
+  j=pop();
+
+  /* restore the timer and signal disposition */
+  setitimer(ITIMER_REAL,&(j->timerinfo),NULL);
+  signal(SIGALRM,j->siginfo);
+
+  free(j);
+  longjmp(j->jmpbuf,JMPVAL);
+  return; /* not reached */
+}
+
+
+/* a simple stack for saving the jump buffer allows us to pass a
+ * variable between functions that don't call each other, in a way
+ * that will survive the longjmp(). 
+ */
+
+/* FIXME problem for threaded ? */
+static jmp_t jmp_head=NULL;
+#ifdef DEBUG
+static int depth = 0;
+static int maxdepth = 0;
+#endif
+
+static jmp_t push(jmp_t j)
+{
+  j->next = jmp_head;
+  jmp_head = j;
+
+#ifdef DEBUG
+  depth++;
+  if (depth > maxdepth) maxdepth = depth;
+#endif
+
+  return j;
+}
+
+static jmp_t pop(void)
+{
+  jmp_t j = jmp_head;
+  if (j) jmp_head = j->next;
+#ifdef DEBUG
+  depth--;
+#endif
+  return j;
+}
+
+#endif /* platform */
-- 
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