options: make the groups/categories constant

[fio.git] / engines / null.c

diff --git a/engines/null.c b/engines/null.c
index acb8cf4170c4e00de963f55bae736250a37109da..41d42e0513b2f2670424c7955d0d03fee2761eb0 100644 (file)
--- a/engines/null.c
+++ b/engines/null.c
@@ -4,6 +4,10 @@
  * 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 null.so null.c -DFIO_EXTERNAL_ENGINE
+ *
  */
 #include <stdio.h>
 #include <stdlib.h>
@@ -12,7 +16,6 @@
 #include <assert.h>
 
 #include "../fio.h"
-#include "../os.h"
 
 struct null_data {
        struct io_u **io_us;
@@ -22,15 +25,16 @@ struct null_data {
 
 static struct io_u *fio_null_event(struct thread_data *td, int event)
 {
-       struct null_data *nd = td->io_ops->data;
+       struct null_data *nd = (struct null_data *) td->io_ops->data;
 
        return nd->io_us[event];
 }
 
-static int fio_null_getevents(struct thread_data *td, int min_events,
-                             int fio_unused max, struct timespec fio_unused *t)
+static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
+                             unsigned int fio_unused max,
+                             const struct timespec fio_unused *t)
 {
-       struct null_data *nd = td->io_ops->data;
+       struct null_data *nd = (struct null_data *) td->io_ops->data;
        int ret = 0;
        
        if (min_events) {
@@ -43,72 +47,58 @@ static int fio_null_getevents(struct thread_data *td, int min_events,
 
 static int fio_null_commit(struct thread_data *td)
 {
-       struct null_data *nd = td->io_ops->data;
+       struct null_data *nd = (struct null_data *) td->io_ops->data;
+
+       if (!nd->events) {
+#ifndef FIO_EXTERNAL_ENGINE
+               io_u_mark_submit(td, nd->queued);
+#endif
+               nd->events = nd->queued;
+               nd->queued = 0;
+       }
 
-       nd->events += nd->queued;
-       nd->queued = 0;
        return 0;
 }
 
-static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u)
+static int fio_null_queue(struct thread_data *td, struct io_u *io_u)
 {
-       struct null_data *nd = td->io_ops->data;
+       struct null_data *nd = (struct null_data *) td->io_ops->data;
+
+       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 fio_null_setup(struct thread_data *td)
-{
-       struct fio_file *f;
-       unsigned int i;
-
-       if (!td->o.size) {
-               log_err("fio: need size= set\n");
-               return 1;
-       }
-
-       td->io_size = td->o.size;
-       td->total_io_size = td->io_size;
-
-       for_each_file(td, f, i) {
-               f->real_file_size = td->total_io_size / td->o.nr_files;
-               f->file_size = f->real_file_size;
-       }
-
-       return 0;
-}
-
 static int fio_null_open(struct thread_data fio_unused *td,
                         struct fio_file fio_unused *f)
 {
-       f->fd = 0;
        return 0;
 }
 
 static void fio_null_cleanup(struct thread_data *td)
 {
-       struct null_data *nd = td->io_ops->data;
+       struct null_data *nd = (struct null_data *) td->io_ops->data;
 
        if (nd) {
-               if (nd->io_us)
-                       free(nd->io_us);
+               free(nd->io_us);
                free(nd);
-               td->io_ops->data = NULL;
        }
 }
 
 static int fio_null_init(struct thread_data *td)
 {
-       struct null_data *nd = malloc(sizeof(*nd));
+       struct null_data *nd = (struct null_data *) malloc(sizeof(*nd));
 
        memset(nd, 0, sizeof(*nd));
 
        if (td->o.iodepth != 1) {
-               nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
+               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;
@@ -117,10 +107,10 @@ static int fio_null_init(struct thread_data *td)
        return 0;
 }
 
+#ifndef __cplusplus
 static struct ioengine_ops ioengine = {
        .name           = "null",
        .version        = FIO_IOOPS_VERSION,
-       .setup          = fio_null_setup,
        .queue          = fio_null_queue,
        .commit         = fio_null_commit,
        .getevents      = fio_null_getevents,
@@ -128,7 +118,7 @@ static struct ioengine_ops ioengine = {
        .init           = fio_null_init,
        .cleanup        = fio_null_cleanup,
        .open_file      = fio_null_open,
-       .flags          = FIO_DISKLESSIO,
+       .flags          = FIO_DISKLESSIO | FIO_FAKEIO,
 };
 
 static void fio_init fio_null_register(void)
@@ -140,3 +130,30 @@ static void fio_exit fio_null_unregister(void)
 {
        unregister_ioengine(&ioengine);
 }
+
+#else
+
+#ifdef FIO_EXTERNAL_ENGINE
+extern "C" {
+void get_ioengine(struct ioengine_ops **ioengine_ptr)
+{
+       struct ioengine_ops *ioengine;
+
+       *ioengine_ptr = (struct ioengine_ops *) malloc(sizeof(struct ioengine_ops));
+       ioengine = *ioengine_ptr;
+
+       strcpy(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 */