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Diff: mbed-os/platform/CriticalSectionLock.h
- Revision:
- 0:8fdf9a60065b
diff -r 000000000000 -r 8fdf9a60065b mbed-os/platform/CriticalSectionLock.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os/platform/CriticalSectionLock.h Wed Oct 10 00:33:53 2018 +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