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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "opal/class/opal_list.h"
#include "opal/threads/mutex.h"
#include "opal/mca/base/base.h"
#include "ompi/mca/io/io.h"
#include "ompi/mca/io/base/base.h"
#include "opal/runtime/opal_progress.h"
/*
* Private variables
*/
static bool initialized = false;
static opal_list_t components_in_use;
#if OMPI_HAVE_THREAD_SUPPORT
static opal_mutex_t mutex;
#endif /* OMPI_HAVE_THREAD_SUPPORT */
struct component_item_t {
opal_list_item_t super;
int refcount;
mca_io_base_version_t version;
mca_io_base_components_t component;
};
typedef struct component_item_t component_item_t;
static OBJ_CLASS_INSTANCE(component_item_t, opal_list_item_t, NULL, NULL);
/*
* Initialize this interface
*/
int mca_io_base_component_init(void)
{
OBJ_CONSTRUCT(&components_in_use, opal_list_t);
initialized = true;
opal_progress_register(mca_io_base_component_run_progress);
return OMPI_SUCCESS;
}
/*
* Add a comoponent to the io framework's currently-in-use list, or
* increase its refcount if it's already in the list.
*/
int mca_io_base_component_add(mca_io_base_components_t *comp)
{
opal_list_item_t *item;
component_item_t *citem;
mca_base_component_t *c;
OPAL_THREAD_LOCK(&mutex);
/* Save the component in ref-counted list of compoonents in use.
This is used for the progression of non-blocking IO requests.
If the component is already on the list, just bump up the
refcount. Otherwise, add it to the list with a refcount of
1. */
for (item = opal_list_get_first(&components_in_use);
item != opal_list_get_end(&components_in_use);
item = opal_list_get_next(item)) {
citem = (component_item_t *) item;
/* Note the memory / pointer trickery here: we don't care what
IO version this component is -- all the members of the
mca_io_base_components union have a base of
mca_base_component_t. mca_base_component_compare() will do
all the Right Things to ensure that the components are the
same. */
if (mca_base_component_compare(
(const mca_base_component_t *) &(citem->component),
(const mca_base_component_t *) comp) == 0) {
++citem->refcount;
OBJ_RETAIN(citem);
break;
}
}
/* If we didn't find it, save it */
if (opal_list_get_end(&components_in_use) == item) {
citem = OBJ_NEW(component_item_t);
citem->refcount = 1;
citem->component = *comp;
c = (mca_base_component_t *) (&citem->component);
if (1 == c->mca_type_major_version &&
0 == c->mca_type_minor_version &&
0 == c->mca_type_release_version) {
citem->version = MCA_IO_BASE_V_1_0_0;
} else {
citem->version = MCA_IO_BASE_V_NONE;
}
opal_list_append(&components_in_use, (opal_list_item_t *) citem);
}
OPAL_THREAD_UNLOCK(&mutex);
/* All done */
return OMPI_SUCCESS;
}
/*
* Find a component in the currently-in-use list and decrease its
* refcount. If the refcount goes to 0, remove it from the list.
*/
int mca_io_base_component_del(mca_io_base_components_t *comp)
{
opal_list_item_t *item;
component_item_t *citem;
OPAL_THREAD_LOCK(&mutex);
/* Find the component in the list */
for (item = opal_list_get_first(&components_in_use);
item != opal_list_get_end(&components_in_use);
item = opal_list_get_next(item)) {
citem = (component_item_t *) item;
/* Note the memory / pointer trickery here: we don't care what
IO version this component is -- all the members of the
mca_io_base_components union have a base of
mca_base_component_t. */
if (mca_base_component_compare(
(const mca_base_component_t *) &(citem->component),
(const mca_base_component_t *) comp) == 0) {
--citem->refcount;
if (0 == citem->refcount) {
opal_list_remove_item(&components_in_use,
(opal_list_item_t *) citem);
}
OBJ_RELEASE(citem);
break;
}
}
OPAL_THREAD_UNLOCK(&mutex);
/* All done */
return OMPI_SUCCESS;
}
/* in this file so that mutex can be static */
int mca_io_base_component_run_progress(void)
{
int ret, count = 0;
opal_list_item_t *item;
component_item_t *citem;
if (! initialized) return 0;
OPAL_THREAD_LOCK(&mutex);
/* Go through all the components and call their progress
function */
for (item = opal_list_get_first(&components_in_use);
item != opal_list_get_end(&components_in_use);
item = opal_list_get_next(item)) {
citem = (component_item_t *) item;
switch (citem->version) {
case MCA_IO_BASE_V_1_0_0:
ret = citem->component.v1_0_0.io_progress();
if (ret > 0) {
count += ret;
}
break;
default:
break;
}
}
OPAL_THREAD_UNLOCK(&mutex);
return count;
}
/*
* Initialize this interface
*/
int mca_io_base_component_finalize(void)
{
initialized = false;
opal_progress_unregister(mca_io_base_component_run_progress);
OBJ_DESTRUCT(&components_in_use);
return OMPI_SUCCESS;
}
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