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diff --git a/ioreplay/src/generate/gwriter.h b/ioreplay/src/generate/gwriter.h
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+// Copyright 2018 Mimecast Ltd.
+//
+// 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 GWRITER_H
+#define GWRITER_H
+
+#include "../datas/rbuffer.h"
+#include "../defaults.h"
+#include "vsize.h"
+#include "gtask.h"
+#include "generate.h"
+
+// Forward declaration (header include hell)
+struct gtask_s_;
+struct generate_s_;
+
+/**
+ * @brief Definition of the writer object
+ *
+ * The writer utilises the information extracted by the parser to actually
+ * write the .replay file.
+ */
+typedef struct gwriter_s_ {
+    bool terminate; /**< The writer thread will terminate if set to true */
+    struct generate_s_ *generate; /**< The generate object */
+    pthread_t pthread; /**< The posix thread */
+    rbuffer_s *queue; /**< A queue of task objects */
+} gwriter_s;
+
+/**
+ * @brief Creates a new writer
+ *
+ * @param g The generate object
+ * @return The new writer object
+ */
+gwriter_s* gwriter_new(struct generate_s_ *g);
+
+/**
+ * @brief Starts the writer thread
+ *
+ * @param w The writer object
+ */
+void gwriter_start(gwriter_s *w);
+
+/**
+ * @brief Terminates the writer thread
+ *
+ * @param w The writer object
+ */
+void gwriter_terminate(gwriter_s *w);
+
+/**
+ * @brief Destroys the writer thread
+ *
+ * @param w The writer object
+ */
+void gwriter_destroy(gwriter_s *w);
+
+/**
+ * @brief Writes a line to the .replay file
+ *
+ * @param w The writer object
+ * @param t The task object
+ */
+void gwriter_write(gwriter_s *w, struct gtask_s_ *t);
+
+/**
+ * @brief Entry function of the writer pthread
+ *
+ * @param data A pointer to the writer object
+ * @return Always returns a NULL pointer if it doesnt crash!
+ */
+void* gwriter_pthread_start(void *data);
+
+#endif // GWRITER_H