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-rw-r--r--lib/erl_interface/src/legacy/erl_timeout.c161
1 files changed, 161 insertions, 0 deletions
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
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+++ 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 */