Bring in a minimum subset of the IoT SDK - at this time just a subset of the library dependencies rather than the libraries themselves.

FreeRTOS-Plus/Source/FreeRTOS-Plus-IoT-SDK/abstractions/platform/freertos/include/platform/iot_platform_types_afr.h

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+/*
+ * Amazon FreeRTOS Platform V1.0.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * 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
+ */
+
+/**
+ * @file iot_platform_types_posix.h
+ * @brief Definitions of platform layer types on POSIX systems.
+ */
+
+#ifndef _IOT_PLATFORM_TYPES_AFR_H_
+#define _IOT_PLATFORM_TYPES_AFR_H_
+
+#include "timers.h"
+
+typedef struct iot_mutex_internal
+{
+    StaticSemaphore_t xMutex;      /**< FreeRTOS mutex. */
+    BaseType_t recursive;                /**< Type; used for indicating if this is reentrant or normal. */
+} iot_mutex_internal_t;
+
+/**
+ * @brief The native mutex type on AFR systems.
+ */
+typedef iot_mutex_internal_t _IotSystemMutex_t;
+
+typedef struct iot_sem_internal
+{
+    StaticSemaphore_t xSemaphore;       /**< FreeRTOS semaphore. */
+} iot_sem_internal_t;
+
+/**
+ * @brief The native semaphore type on AFR systems.
+ */
+typedef iot_sem_internal_t _IotSystemSemaphore_t;
+
+/**
+ * @brief Holds information about an active detached thread so that we can
+ *        delete the FreeRTOS task when it completes
+ */
+typedef struct threadInfo
+{
+    void * pArgument;                 /**< @brief Argument to `threadRoutine`. */
+    void ( *threadRoutine )( void * );/**< @brief Thread function to run. */
+} threadInfo_t;
+
+/**
+ * @brief Holds information about an active timer.
+ */
+typedef struct timerInfo
+{
+    TimerHandle_t timer;                    /**< @brief Underlying timer. */
+    void ( *threadRoutine )( void * );      /**< @brief Thread function to run on timer expiration. */
+    void * pArgument;                       /**< @brief First argument to threadRoutine. */
+    StaticTimer_t xTimerBuffer;             /**< Memory that holds the FreeRTOS timer. */
+    TickType_t xTimerPeriod;                /**< Period of this timer. */
+} timerInfo_t;
+
+/**
+ * @brief Represents an #IotTimer_t on AFR systems.
+ */
+typedef timerInfo_t _IotSystemTimer_t;
+
+#endif /* ifndef _IOT_PLATFORM_TYPES_POSIX_H_ */