Diff: source/EventQueue/util/CriticalSectionLock.h

Revision:

0:1c7da5f83647

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/EventQueue/util/CriticalSectionLock.h	Tue Nov 29 06:29:10 2016 +0000
@@ -0,0 +1,59 @@
+/*
+ * PackageLicenseDeclared: Apache-2.0
+ * Copyright (c) 2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __MBED_UTIL_CRITICAL_SECTION_LOCK_H__
+#define __MBED_UTIL_CRITICAL_SECTION_LOCK_H__
+
+#include <stdint.h>
+#include "cmsis.h"
+
+namespace mbed {
+namespace util {
+
+/** RAII object for disabling, then restoring, interrupt state
+  * Usage:
+  * @code
+  *
+  * void f() {
+  *     // some code here
+  *     {
+  *         CriticalSectionLock lock;
+  *         // Code in this block will run with interrupts disabled
+  *     }
+  *     // interrupts will be restored to their previous state
+  * }
+  * @endcode
+  */
+class CriticalSectionLock {
+public:
+    CriticalSectionLock() {
+        _state = __get_PRIMASK();
+        __disable_irq();
+    }
+
+    ~CriticalSectionLock() {
+        __set_PRIMASK(_state);
+    }
+
+private:
+    uint32_t _state;
+};
+
+} // namespace util
+} // namespace mbed
+
+#endif // #ifndef __MBED_UTIL_CRITICAL_SECTION_LOCK_H__