From 25a132cff2f8e6158e95446b0bf8be6d652687bc Mon Sep 17 00:00:00 2001
From: adamdunkels <adamdunkels>
Date: Tue, 26 Sep 2006 20:53:27 +0000
Subject: [PATCH] A module that allows Contiki processes to have subprocesses.
 A subprocess is defined within another process and is created on the fly when
 needed.

---
 core/sys/subprocess.h | 70 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 core/sys/subprocess.h

diff --git a/core/sys/subprocess.h b/core/sys/subprocess.h
new file mode 100644
index 000000000..b92527548
--- /dev/null
+++ b/core/sys/subprocess.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2006, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: subprocess.h,v 1.1 2006/09/26 20:53:27 adamdunkels Exp $
+ */
+
+/**
+ * \addtogroup sys
+ * @{
+ */
+
+/**
+ * \defgroup subprocess Contiki subprocesses
+ * @{
+ *
+ * A Contiki subprocess is a "process-in-a-process".
+ */
+
+/**
+ * \file
+ *         Subprocesses for Contiki
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#ifndef __SUBPROCESS_H__
+#define __SUBPROCESS_H__
+
+#define SUBPROCESS_BEGIN(strname)					\
+{									\
+  static struct process subprocess_subprocess = {NULL, strname};	\
+  subprocess_subprocess.thread = PROCESS_CURRENT()->thread;		\
+  process_start(&subprocess_subprocess, NULL);				\
+  PT_INIT(&subprocess_subprocess.pt);					\
+  LC_SET(subprocess_subprocess.pt.lc);					\
+  if(PROCESS_CURRENT() == &subprocess_subprocess) {
+
+#define SUBPROCESS_END()			\
+    PROCESS_EXIT();				\
+  }						\
+}
+
+#endif /* __SUBPROCESS_H__ */