xiaoxiang781216 commented on a change in pull request #1009:
URL: https://github.com/apache/incubator-nuttx/pull/1009#discussion_r422494270
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File path: arch/sim/src/sim/up_timer.c
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@@ -0,0 +1,169 @@
+/****************************************************************************
+ * arch/sim/src/sim/up_timer.c
+ *
+ * Copyright (C) 2014, 2019 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <gn...@nuttx.org>
+ * Sebastian Ene <sebastian.en...@gmail.com>
+ *
+ * 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 NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdarg.h>
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+
+#include "../../../../include/nuttx/config.h"
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+typedef void (*sched_timer_callback_t)(void);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static sched_timer_callback_t g_sched_process_timer_cb;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: host_signal_handler
+ *
+ * Description:
+ * The signal handler is called periodically and is used to deliver TICK
+ * events to the OS.
+ *
+ ****************************************************************************/
+static void host_signal_handler(int sig, siginfo_t *si, void *old_ucontext)
+{
+ g_sched_process_timer_cb();
Review comment:
Yes, I saw your patch which disable/enable signal in save/restore irq.
That's why ask you reorg your patch set to ensure each patch work correctly.
From my review, most patch need merge into three:
1.The alarm timer
2.ucontext
3.nsh3 config
But I think item 2 doesn't need which just increase the complex and porting
effort.
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