diff --git a/container/SharedRingBuffer.cpp b/container/SharedRingBuffer.cpp new file mode 100644 index 00000000..001a21ed --- /dev/null +++ b/container/SharedRingBuffer.cpp @@ -0,0 +1,30 @@ +#include +#include +#include + +SharedRingBuffer::SharedRingBuffer(object_id_t objectId, const size_t size, + bool overwriteOld, size_t maxExcessBytes): + SystemObject(objectId), SimpleRingBuffer(size, overwriteOld, + maxExcessBytes) { + mutex = MutexFactory::instance()->createMutex(); +} + +SharedRingBuffer::SharedRingBuffer(object_id_t objectId, uint8_t *buffer, + const size_t size, bool overwriteOld, size_t maxExcessBytes): + SystemObject(objectId), SimpleRingBuffer(buffer, size, overwriteOld, + maxExcessBytes) { + mutex = MutexFactory::instance()->createMutex(); +} + +ReturnValue_t SharedRingBuffer::lockRingBufferMutex( + MutexIF::TimeoutType timeoutType, dur_millis_t timeout) { + return mutex->lockMutex(timeoutType, timeout); +} + +ReturnValue_t SharedRingBuffer::unlockRingBufferMutex() { + return mutex->unlockMutex(); +} + +MutexIF* SharedRingBuffer::getMutexHandle() const { + return mutex; +} diff --git a/container/SharedRingBuffer.h b/container/SharedRingBuffer.h new file mode 100644 index 00000000..0b5be052 --- /dev/null +++ b/container/SharedRingBuffer.h @@ -0,0 +1,68 @@ +#ifndef FRAMEWORK_CONTAINER_SHAREDRINGBUFFER_H_ +#define FRAMEWORK_CONTAINER_SHAREDRINGBUFFER_H_ + +#include +#include +#include +#include + +/** + * @brief Ring buffer which can be shared among multiple objects + * @details + * This class offers a mutex to perform thread-safe operation on the ring + * buffer. It is still up to the developer to actually perform the lock + * and unlock operations. + */ +class SharedRingBuffer: public SystemObject, + public SimpleRingBuffer { +public: + /** + * This constructor allocates a new internal buffer with the supplied size. + * @param size + * @param overwriteOld + * If the ring buffer is overflowing at a write operartion, the oldest data + * will be overwritten. + */ + SharedRingBuffer(object_id_t objectId, const size_t size, + bool overwriteOld, size_t maxExcessBytes); + + /** + * This constructor takes an external buffer with the specified size. + * @param buffer + * @param size + * @param overwriteOld + * If the ring buffer is overflowing at a write operartion, the oldest data + * will be overwritten. + */ + SharedRingBuffer(object_id_t objectId, uint8_t* buffer, const size_t size, + bool overwriteOld, size_t maxExcessBytes); + + /** + * Unless a read-only constant value is read, all operations on the + * shared ring buffer should be protected by calling this function. + * @param timeoutType + * @param timeout + * @return + */ + virtual ReturnValue_t lockRingBufferMutex(MutexIF::TimeoutType timeoutType, + dur_millis_t timeout); + /** + * Any locked mutex also has to be unlocked, otherwise, access to the + * shared ring buffer will be blocked. + * @return + */ + virtual ReturnValue_t unlockRingBufferMutex(); + + /** + * The mutex handle can be accessed directly, for example to perform + * the lock with the #MutexHelper for a RAII compliant lock operation. + * @return + */ + MutexIF* getMutexHandle() const; +private: + MutexIF* mutex = nullptr; +}; + + + +#endif /* FRAMEWORK_CONTAINER_SHAREDRINGBUFFER_H_ */