初始版本

2026-04-23 13:49:53 +08:00
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+/*
+ * Copyright (c) 2025, Your Name.
+ * 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 implements the extensions to the protothreads library.
+ *
+ * Author: Your Name <your.email@example.com>
+ */
+
+#include "pt_ext.h"
+
+/**
+ * Global tick counter.
+ *
+ * This variable is used to track system ticks. It should be incremented
+ * by the system tick interrupt or a similar mechanism.
+ */
+volatile unsigned int pt_ticks = 0;
+
+/**
+ * Increment the system tick counter.
+ */
+void
+pt_ticks_inc(void)
+{
+    pt_ticks++;
+}
+
+/**
+ * Get the current system tick counter.
+ *
+ * \return The current tick count.
+ */
+unsigned int
+pt_ticks_get(void)
+{
+    return pt_ticks;
+}
+
+/**
+ * Check if timeout has occurred, handling tick counter overflow.
+ */
+int
+pt_is_timeout(unsigned int start, unsigned int end, unsigned int timeout)
+{
+    return (end - start) >= timeout || 
+           ((end < start) && (UINT_MAX - start + end + 1) >= timeout);
+}
+
+/**
+ * Initialize the protothreads extensions.
+ *
+ * This function resets the global tick counter to zero.
+ */
+void
+pt_ext_init(void)
+{
+    pt_ticks = 0;
+}