Handout

kernel/sync/message.h

@@ -0,0 +1,44 @@
+#pragma once
+#include "../object/queue.h"
+#include "../types.h"
+
+struct Message {
+	const size_t pid;  ///< Sender Thread ID of message
+
+	const uintptr_t sbuffer;  ///< Send buffer
+	const size_t ssize;		  ///< Send buffer size
+
+	const uintptr_t rbuffer;  ///< Receive buffer
+	const size_t rsize;		  ///< Receive buffer size
+
+	Message *queue_link = nullptr;	///< Next message in the message queue
+
+	/*! \brief Constructor
+	 *  \param pid     Sender Thread ID of message
+	 *  \param sbuffer Send buffer
+	 *  \param ssize   Send buffer size
+	 *  \param rbuffer Receive buffer
+	 *  \param rsize   Receive buffer size
+	 */
+	explicit Message(int pid, uintptr_t sbuffer = 0, size_t ssize = 0,
+					 uintptr_t rbuffer = 0, size_t rsize = 0)
+		: pid(pid),
+		  sbuffer(sbuffer),
+		  ssize(ssize),
+		  rbuffer(rbuffer),
+		  rsize(rsize) {}
+
+	/*! \brief Helper to retrieve (and remove) a message from the queue
+	 *  \param pid   Thread id of message
+	 *  \param queue Queue with message
+	 *  \return Pointer to message or nullptr
+	 */
+	static Message *dequeueByPID(size_t pid, Queue<Message> &queue) {
+		for (Message *m : queue) {
+			if (m->pid == pid) {
+				return queue.remove(m);
+			}
+		}
+		return nullptr;
+	}
+};