feat(rt/posix): Added FreeRTOS-Plus-POSIX message queues implementation

Note: The current mq_open() implementation is changed to match
      the POSIX standard.

components/rt/private_include/FreeRTOS_POSIX_internal.h

@@ -0,0 +1,101 @@
+/*
+ * Amazon FreeRTOS+POSIX V1.0.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-FileCopyrightText: 2018 Amazon.com, Inc. or its affiliates
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * SPDX-FileContributor: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+#ifndef _FREERTOS_POSIX_INTERNAL_H_
+#define _FREERTOS_POSIX_INTERNAL_H_
+
+/**
+ * @file FreeRTOS_POSIX_internal.h
+ * @brief Internal structs and initializers for FreeRTOS+POSIX.
+ */
+
+/* Amazon FreeRTOS includes. */
+#include "aws_doubly_linked_list.h"
+
+/**
+ * @brief Mutex attribute object.
+ */
+typedef struct pthread_mutexattr_internal
+{
+    int iType; /**< Mutex type. */
+} pthread_mutexattr_internal_t;
+
+/**
+ * @brief Mutex.
+ */
+typedef struct pthread_mutex_internal
+{
+    BaseType_t xIsInitialized;          /**< Set to pdTRUE if this mutex is initialized, pdFALSE otherwise. */
+    StaticSemaphore_t xMutex;           /**< FreeRTOS mutex. */
+    TaskHandle_t xTaskOwner;            /**< Owner; used for deadlock detection and permission checks. */
+    pthread_mutexattr_internal_t xAttr; /**< Mutex attributes. */
+} pthread_mutex_internal_t;
+
+/**
+ * @brief Compile-time initializer of pthread_mutex_internal_t.
+ */
+#define FREERTOS_POSIX_MUTEX_INITIALIZER \
+    ( &( ( pthread_mutex_internal_t )    \
+    {                                    \
+        .xIsInitialized = pdFALSE,       \
+        .xMutex = { { 0 } },             \
+        .xTaskOwner = NULL,              \
+        .xAttr = { .iType = 0 }          \
+    }                                    \
+         )                               \
+    )
+
+/**
+ * @brief Condition variable.
+ */
+typedef struct pthread_cond_internal
+{
+    BaseType_t xIsInitialized;            /**< Set to pdTRUE if this condition variable is initialized, pdFALSE otherwise. */
+    StaticSemaphore_t xCondMutex;         /**< Prevents concurrent accesses to iWaitingThreads. */
+    StaticSemaphore_t xCondWaitSemaphore; /**< Threads block on this semaphore in pthread_cond_wait. */
+    int iWaitingThreads;                  /**< The number of threads currently waiting on this condition variable. */
+} pthread_cond_internal_t;
+
+/**
+ * @brief Compile-time initializer of pthread_cond_internal_t.
+ */
+#define FREERTOS_POSIX_COND_INITIALIZER  \
+    ( &( ( pthread_cond_internal_t )     \
+    {                                    \
+        .xIsInitialized = pdFALSE,       \
+        .xCondMutex = { { 0 } },         \
+        .xCondWaitSemaphore = { { 0 } }, \
+        .iWaitingThreads = 0             \
+    }                                    \
+         )                               \
+    )
+
+#endif /* _FREERTOS_POSIX_INTERNAL_H_ */