Added mutex support

include/etl/mutex.h

@@ -0,0 +1,47 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2018 jwellbelove
+
+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__
+#define __ETL_MUTEX__
+
+#include "platform.h"
+
+#if ETL_CPP11_SUPPORTED == 1
+  #include "mutex/mutex_std.h"
+  #define ETL_HAS_MUTEX 1
+#elif defined(ETL_COMPILER_ARM)
+  #include "mutex/mutex_arm.h"
+  #define ETL_HAS_MUTEX 1
+#elif defined(ETL_COMPILER_GCC)
+  #include "mutex/mutex_gcc_sync.h"
+  #define ETL_HAS_MUTEX 1
+#else
+  #define ETL_HAS_MUTEX 0
+#endif
+
+#endif

include/etl/mutex/mutex_arm.h

@@ -0,0 +1,34 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2017 jwellbelove
+
+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_ARM__
+#define __ETL_MUTEX_ARM__
+
+#include "mutex_gcc_sync.h"
+
+#endif

include/etl/mutex/mutex_gcc_sync.h

@@ -0,0 +1,77 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2017 jwellbelove
+
+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_GCC_SYNC__
+#define __ETL_MUTEX_GCC_SYNC__
+
+#include "../platform.h"
+
+#include <stdint.h>
+
+namespace etl
+{
+  //***************************************************************************
+  ///\ingroup mutex
+  ///\brief This mutex class is implemented using GCC's __sync functions.
+  //***************************************************************************
+  class mutex
+  {
+  public:
+
+    mutex()
+      : flag(0)
+    {
+      __sync_lock_release(flag);
+    }
+
+    void lock()
+    {
+      while (__sync_lock_test_and_set(&flag, 1U))
+      {
+        while (flag)
+        {
+        }
+    }
+
+    bool try_lock()
+    {
+      return (__sync_lock_test_and_set(&flag, 1U) == 1U);
+    }
+
+    void unlock()
+    {
+      __sync_lock_release(flag);
+    }
+
+  private:
+
+    volatile uint32_t flag;
+  };
+}
+
+#endif

include/etl/mutex/mutex_std.h

@@ -0,0 +1,72 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2017 jwellbelove
+
+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_STD__
+#define __ETL_MUTEX_STD__
+
+#include "../platform.h"
+
+#include <mutex>
+
+namespace etl
+{
+  //***************************************************************************
+  ///\ingroup mutex
+  ///\brief This mutex class is implemented using std::mutex.
+  //***************************************************************************
+  class mutex
+  {
+  public:
+
+    mutex()
+      : access()
+    {
+    }
+
+    void lock()
+    {
+      access.lock();
+    }
+
+    bool try_lock()
+    {
+      return access.try_lock();
+    }
+
+    void unlock()
+    {
+      access.unlock();
+    }
+
+  private:
+
+    std::mutex access;
+  };
+}
+
+#endif