X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Fnull.c;h=4cc0102b993e64a01e5f1804ea6a6ccfe7951a36;hp=fc829473acc39bc8b494bde47ba59012cf3de145;hb=01bf5128d0581e267383f280c6a1dcd26517240f;hpb=f8fe35e8c9e88dd681ea151251d75f6116a958b4

diff --git a/engines/null.c b/engines/null.c
index fc829473..4cc0102b 100644
--- a/engines/null.c
+++ b/engines/null.c
@@ -1,76 +1,157 @@
 /*
- * null engine - doesn't do any transfers. Used to test fio.
+ * null engine
+ *
+ * IO engine that doesn't do any real IO transfers, it just pretends to.
+ * The main purpose is to test fio itself.
+ *
+ * It also can act as external C++ engine - compiled with:
+ *
+ * g++ -O2 -g -shared -rdynamic -fPIC -o cpp_null null.c -DFIO_EXTERNAL_ENGINE
+ *
+ * to test it execute:
+ *
+ * LD_LIBRARY_PATH=./engines ./fio examples/cpp_null.fio
  *
  */
-#include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
 #include <assert.h>
 
 #include "../fio.h"
-#include "../os.h"
 
 struct null_data {
-	struct io_u *last_io_u;
+	struct io_u **io_us;
+	int queued;
+	int events;
 };
 
-static int fio_null_getevents(struct thread_data *td, int fio_unused min,
-			      int max, struct timespec fio_unused *t)
+static struct io_u *null_event(struct null_data *nd, int event)
+{
+	return nd->io_us[event];
+}
+
+static int null_getevents(struct null_data *nd, unsigned int min_events,
+			  unsigned int fio_unused max,
+			  const struct timespec fio_unused *t)
+{
+	int ret = 0;
+
+	if (min_events) {
+		ret = nd->events;
+		nd->events = 0;
+	}
+
+	return ret;
+}
+
+static int null_commit(struct thread_data *td, struct null_data *nd)
+{
+	if (!nd->events) {
+#ifndef FIO_EXTERNAL_ENGINE
+		io_u_mark_submit(td, nd->queued);
+#endif
+		nd->events = nd->queued;
+		nd->queued = 0;
+	}
+
+	return 0;
+}
+
+static enum fio_q_status null_queue(struct thread_data *td,
+				    struct null_data *nd, struct io_u *io_u)
+{
+	fio_ro_check(td, io_u);
+
+	if (td->io_ops->flags & FIO_SYNCIO)
+		return FIO_Q_COMPLETED;
+	if (nd->events)
+		return FIO_Q_BUSY;
+
+	nd->io_us[nd->queued++] = io_u;
+	return FIO_Q_QUEUED;
+}
+
+static int null_open(struct null_data fio_unused *nd,
+		     struct fio_file fio_unused *f)
 {
-	assert(max <= 1);
+	return 0;
+}
 
-	if (list_empty(&td->io_u_busylist))
-		return 0;
+static void null_cleanup(struct null_data *nd)
+{
+	if (nd) {
+		free(nd->io_us);
+		free(nd);
+	}
+}
+
+static struct null_data *null_init(struct thread_data *td)
+{
+	struct null_data *nd = (struct null_data *) malloc(sizeof(*nd));
 
-	return 1;
+	memset(nd, 0, sizeof(*nd));
+
+	if (td->o.iodepth != 1) {
+		nd->io_us = (struct io_u **) malloc(td->o.iodepth * sizeof(struct io_u *));
+		memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
+	} else
+		td->io_ops->flags |= FIO_SYNCIO;
+
+	return nd;
 }
 
+#ifndef __cplusplus
+
 static struct io_u *fio_null_event(struct thread_data *td, int event)
 {
-	struct null_data *nd = td->io_ops->data;
+	return null_event(td->io_ops_data, event);
+}
 
-	assert(event == 0);
+static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
+			      unsigned int max, const struct timespec *t)
+{
+	struct null_data *nd = td->io_ops_data;
+	return null_getevents(nd, min_events, max, t);
+}
 
-	return nd->last_io_u;
+static int fio_null_commit(struct thread_data *td)
+{
+	return null_commit(td, td->io_ops_data);
 }
 
-static int fio_null_queue(struct thread_data *td, struct io_u *io_u)
+static enum fio_q_status fio_null_queue(struct thread_data *td,
+					struct io_u *io_u)
 {
-	struct null_data *nd = td->io_ops->data;
+	return null_queue(td, td->io_ops_data, io_u);
+}
 
-	io_u->resid = 0;
-	io_u->error = 0;
-	nd->last_io_u = io_u;
-	return 0;
+static int fio_null_open(struct thread_data *td, struct fio_file *f)
+{
+	return null_open(td->io_ops_data, f);
 }
 
 static void fio_null_cleanup(struct thread_data *td)
 {
-	if (td->io_ops->data) {
-		free(td->io_ops->data);
-		td->io_ops->data = NULL;
-	}
+	null_cleanup(td->io_ops_data);
 }
 
 static int fio_null_init(struct thread_data *td)
 {
-	struct null_data *nd = malloc(sizeof(*nd));
-
-	nd->last_io_u = NULL;
-	td->io_ops->data = nd;
+	td->io_ops_data = null_init(td);
+	assert(td->io_ops_data);
 	return 0;
 }
 
 static struct ioengine_ops ioengine = {
 	.name		= "null",
 	.version	= FIO_IOOPS_VERSION,
-	.init		= fio_null_init,
 	.queue		= fio_null_queue,
+	.commit		= fio_null_commit,
 	.getevents	= fio_null_getevents,
 	.event		= fio_null_event,
+	.init		= fio_null_init,
 	.cleanup	= fio_null_cleanup,
-	.flags		= FIO_SYNCIO,
+	.open_file	= fio_null_open,
+	.flags		= FIO_DISKLESSIO | FIO_FAKEIO,
 };
 
 static void fio_init fio_null_register(void)
@@ -82,3 +163,114 @@ static void fio_exit fio_null_unregister(void)
 {
 	unregister_ioengine(&ioengine);
 }
+
+#else
+
+#ifdef FIO_EXTERNAL_ENGINE
+
+struct NullData {
+	NullData(struct thread_data *td)
+	{
+		impl_ = null_init(td);
+		assert(impl_);
+	}
+
+	~NullData()
+	{
+		null_cleanup(impl_);
+	}
+
+	static NullData *get(struct thread_data *td)
+	{
+		return reinterpret_cast<NullData *>(td->io_ops_data);
+	}
+
+	io_u *fio_null_event(struct thread_data *, int event)
+	{
+		return null_event(impl_, event);
+	}
+
+	int fio_null_getevents(struct thread_data *, unsigned int min_events,
+			       unsigned int max, const struct timespec *t)
+	{
+		return null_getevents(impl_, min_events, max, t);
+	}
+
+	int fio_null_commit(struct thread_data *td)
+	{
+		return null_commit(td, impl_);
+	}
+
+	int fio_null_queue(struct thread_data *td, struct io_u *io_u)
+	{
+		return null_queue(td, impl_, io_u);
+	}
+
+	int fio_null_open(struct thread_data *, struct fio_file *f)
+	{
+		return null_open(impl_, f);
+	}
+
+private:
+	struct null_data *impl_;
+};
+
+extern "C" {
+
+static struct io_u *fio_null_event(struct thread_data *td, int event)
+{
+	return NullData::get(td)->fio_null_event(td, event);
+}
+
+static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
+			      unsigned int max, const struct timespec *t)
+{
+	return NullData::get(td)->fio_null_getevents(td, min_events, max, t);
+}
+
+static int fio_null_commit(struct thread_data *td)
+{
+	return NullData::get(td)->fio_null_commit(td);
+}
+
+static int fio_null_queue(struct thread_data *td, struct io_u *io_u)
+{
+	return NullData::get(td)->fio_null_queue(td, io_u);
+}
+
+static int fio_null_open(struct thread_data *td, struct fio_file *f)
+{
+	return NullData::get(td)->fio_null_open(td, f);
+}
+
+static int fio_null_init(struct thread_data *td)
+{
+	td->io_ops_data = new NullData(td);
+	return 0;
+}
+
+static void fio_null_cleanup(struct thread_data *td)
+{
+	delete NullData::get(td);
+}
+
+static struct ioengine_ops ioengine;
+void get_ioengine(struct ioengine_ops **ioengine_ptr)
+{
+	*ioengine_ptr = &ioengine;
+
+	ioengine.name           = "cpp_null";
+	ioengine.version        = FIO_IOOPS_VERSION;
+	ioengine.queue          = fio_null_queue;
+	ioengine.commit         = fio_null_commit;
+	ioengine.getevents      = fio_null_getevents;
+	ioengine.event          = fio_null_event;
+	ioengine.init           = fio_null_init;
+	ioengine.cleanup        = fio_null_cleanup;
+	ioengine.open_file      = fio_null_open;
+	ioengine.flags          = FIO_DISKLESSIO | FIO_FAKEIO;
+}
+}
+#endif /* FIO_EXTERNAL_ENGINE */
+
+#endif /* __cplusplus */