Diff: mbed-dev-master/platform/CriticalSectionLock.h

Revision:

0:bb348c97df44

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev-master/platform/CriticalSectionLock.h	Wed Sep 16 01:11:49 2020 +0000
@@ -0,0 +1,115 @@
+/*
+ * PackageLicenseDeclared: Apache-2.0
+ * Copyright (c) 2017 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_CRITICALSECTIONLOCK_H
+#define MBED_CRITICALSECTIONLOCK_H
+
+#include "platform/mbed_critical.h"
+#include "platform/mbed_toolchain.h"
+
+namespace mbed {
+
+/** \addtogroup platform */
+/** @{*/
+/**
+ * \defgroup platform_CriticalSectionLock CriticalSectionLock functions
+ * @{
+ */
+
+/** RAII object for disabling, then restoring, interrupt state
+  * Usage:
+  * @code
+  *
+  * // RAII style usage
+  * unsigned int atomic_counter_increment(unsigned int &counter) {
+  *     CriticalSectionLock lock;
+  *     // Code in this block will run with interrupts disabled
+  *     // Interrupts will be restored to their previous state automatically
+  *     // at the end of function scope
+  *     return ++counter;
+  * }
+  *
+  * // free locking usage
+  * unsigned int atomic_counter_decrement(unsigned int &counter) {
+  *     CriticalSectionLock::enable();
+  *     // Code in this block will run with interrupts disabled
+  *     counter--;
+  *     CriticalSectionLock::disable(); // need explicitly to disable critical section lock
+  *     // interrupts will be restored to their previous state here
+  *     return counter;
+  * }
+  *
+  * @endcode
+  */
+class CriticalSectionLock {
+public:
+    CriticalSectionLock()
+    {
+        core_util_critical_section_enter();
+    }
+
+    ~CriticalSectionLock()
+    {
+        core_util_critical_section_exit();
+    }
+
+    /** Mark the start of a critical section
+     *  @deprecated This function is inconsistent with RAII and is being removed in the future. Replaced by static function CriticalSectionLock::enable.
+     *
+     */
+    MBED_DEPRECATED_SINCE("mbed-os-5.8",
+                          "This function is inconsistent with RAII and is being removed in the future."
+                          "Replaced by static function CriticalSectionLock::enable.")
+    void lock()
+    {
+        core_util_critical_section_enter();
+    }
+
+    /** Mark the end of a critical section
+     *  @deprecated This function is inconsistent with RAII and is being removed in the future. Replaced by static function CriticalSectionLock::enable.
+     *
+     */
+    MBED_DEPRECATED_SINCE("mbed-os-5.8",
+                          "This function is inconsistent with RAII and is being removed in the future."
+                          "Replaced by static function CriticalSectionLock::disable.")
+    void unlock()
+    {
+        core_util_critical_section_exit();
+    }
+
+    /** Mark the start of a critical section
+     */
+    static void enable()
+    {
+        core_util_critical_section_enter();
+    }
+
+    /** Mark the end of a critical section
+     */
+    static void disable()
+    {
+        core_util_critical_section_exit();
+    }
+};
+
+/**@}*/
+
+/**@}*/
+
+} // namespace mbed
+
+#endif