建立工程，成功创建两个虚拟串口

source/OpenAMP/libmetal/lib/system/zephyr/mutex.h

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+/*
+ * Copyright (c) 2017, Linaro Limited. and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * @file	zephyr/mutex.h
+ * @brief	Zephyr mutex primitives for libmetal.
+ */
+
+#ifndef __METAL_MUTEX__H__
+#error "Include metal/mutex.h instead of metal/zephyr/mutex.h"
+#endif
+
+#ifndef __METAL_ZEPHYR_MUTEX__H__
+#define __METAL_ZEPHYR_MUTEX__H__
+
+#include <metal/atomic.h>
+#include <kernel.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct k_sem metal_mutex_t;
+
+/*
+ * METAL_MUTEX_INIT - used for initializing an mutex elmenet in a static struct
+ * or global
+ */
+#define METAL_MUTEX_INIT(m) _K_SEM_INITIALIZER(m, 1, 1)
+/*
+ * METAL_MUTEX_DEFINE - used for defining and initializing a global or
+ * static singleton mutex
+ */
+#define METAL_MUTEX_DEFINE(m) K_SEM_DEFINE(m, 1, 1)
+
+static inline void __metal_mutex_init(metal_mutex_t *m)
+{
+	k_sem_init(m, 1, 1);
+}
+
+static inline void __metal_mutex_deinit(metal_mutex_t *m)
+{
+	(void)m;
+}
+
+static inline int __metal_mutex_try_acquire(metal_mutex_t *m)
+{
+        int key = irq_lock(), ret = 1;
+
+        if (m->count) {
+                m->count = 0;
+                ret = 0;
+        }
+
+        irq_unlock(key);
+
+        return ret;
+}
+
+static inline int __metal_mutex_is_acquired(metal_mutex_t *m)
+{
+        int key = irq_lock(), ret;
+
+	ret = m->count;
+
+        irq_unlock(key);
+
+	return ret;
+}
+
+static inline void __metal_mutex_acquire(metal_mutex_t *m)
+{
+	k_sem_take(m, K_FOREVER);
+}
+
+static inline void __metal_mutex_release(metal_mutex_t *m)
+{
+	k_sem_give(m);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __METAL_ZEPHYR_MUTEX__H__ */