feat(mutex): Add ThreadX mutex support (#1252)

* feat(mutex): Add ThreadX mutex support

* fix(mutex): Fix ThreadX mutex naming and destructor issues

Correct the header guard macro naming error from ETL_MUTEX_THREAD to ETL_MUTEX_THREADX
Add mutex destructor to properly release resources
Modify mutex creation name identifier to "etl mutex"

---------

Co-authored-by: littepoint <1053049738@qq.com>

include/etl/mutex.h

@@ -37,6 +37,9 @@ SOFTWARE.
 #elif defined(ETL_TARGET_OS_FREERTOS)
   #include "mutex/mutex_freertos.h"
   #define ETL_HAS_MUTEX 1
+#elif defined(ETL_TARGET_OS_THREADX)
+  #include "mutex/mutex_threadx.h"
+  #define ETL_HAS_MUTEX 1
 #elif ETL_USING_STL && ETL_USING_CPP11
   #include "mutex/mutex_std.h"
   #define ETL_HAS_MUTEX 1
@@ -62,7 +65,7 @@ namespace etl
 
   //***************************************************************************
   /// lock_guard
-  /// A mutex wrapper that provides an RAII mechanism for owning a mutex for 
+  /// A mutex wrapper that provides an RAII mechanism for owning a mutex for
   /// the duration of a scoped block.
   //***************************************************************************
   template <typename TMutex>

include/etl/mutex/mutex_threadx.h

@@ -0,0 +1,81 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2020 Phil Wise phil@phil-wise.com
+
+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.
+******************************************************************************/
+
+#ifndef ETL_MUTEX_THREADX_INCLUDED
+#define ETL_MUTEX_THREADX_INCLUDED
+
+#include "../platform.h"
+
+#include "tx_api.h"
+
+namespace etl
+{
+  //***************************************************************************
+  ///\ingroup mutex
+  ///\brief This mutex class is implemented using ThreadX's mutexes
+  //***************************************************************************
+  class mutex
+  {
+  public:
+
+    mutex()
+    {
+      tx_mutex_create(&mutex_handle, "etl mutex", TX_INHERIT);
+    }
+
+    ~mutex()
+    {
+      tx_mutex_delete(&mutex_handle);
+    }
+
+    void lock()
+    {
+      tx_mutex_get(&mutex_handle, TX_WAIT_FOREVER);
+    }
+
+    bool try_lock()
+    {
+      return tx_mutex_get(&mutex_handle, TX_NO_WAIT) == TX_SUCCESS;
+    }
+
+    void unlock()
+    {
+      tx_mutex_put(&mutex_handle);
+    }
+
+  private:
+    // Non-copyable
+    mutex(const mutex&) ETL_DELETE;
+    mutex& operator=(const mutex&) ETL_DELETE;
+
+    // mutex handle
+    TX_MUTEX mutex_handle;
+  };
+}
+
+#endif