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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5ESlist.c
*
* Purpose: Operations on "event lists" for managing asynchronous
* operations.
*
* Please see the asynchronous I/O RFC document
* for a full description of how they work, etc.
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#include "H5ESmodule.h" /* This source code file is part of the H5ES module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5ESpkg.h" /* Event Sets */
#include "H5FLprivate.h" /* Free Lists */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5ES__list_insert
*
* Purpose: Append an event into an event list
*
* Return: SUCCEED / FAIL
*
*-------------------------------------------------------------------------
*/
void
H5ES__list_append(H5ES_event_list_t *el, H5ES_event_t *ev)
{
FUNC_ENTER_PACKAGE_NOERR
/* Sanity check */
assert(el);
assert(ev);
ev->next = NULL;
/* Append event onto the event list */
if (NULL == el->tail)
el->head = el->tail = ev;
else {
ev->prev = el->tail;
el->tail->next = ev;
el->tail = ev;
} /* end else */
/* Increment the # of events in list */
el->count++;
FUNC_LEAVE_NOAPI_VOID
} /* end H5ES__list_append() */
/*-------------------------------------------------------------------------
* Function: H5ES__list_count
*
* Purpose: Retrieve # of events in an event list
*
* Return: SUCCEED / FAIL
*
*-------------------------------------------------------------------------
*/
H5_ATTR_PURE size_t
H5ES__list_count(const H5ES_event_list_t *el)
{
FUNC_ENTER_PACKAGE_NOERR
/* Sanity check */
assert(el);
FUNC_LEAVE_NOAPI(el->count)
} /* end H5ES__list_count() */
/*-------------------------------------------------------------------------
* Function: H5ES__list_iterate
*
* Purpose: Iterate over events in a list, calling callback for
* each event.
*
* Note: Iteration is safe for deleting the current event. Modifying
* the list in other ways is likely unsafe. If order is
* H5_ITER_INC or H5_ITER_NATIVE events are visited starting
* with the oldest, otherwise they are visited starting with
* the newest.
*
* Return: SUCCEED / FAIL
*
*-------------------------------------------------------------------------
*/
int
H5ES__list_iterate(H5ES_event_list_t *el, H5_iter_order_t order, H5ES_list_iter_func_t cb, void *ctx)
{
H5ES_event_t *ev; /* Event in list */
int ret_value = H5_ITER_CONT; /* Return value */
FUNC_ENTER_PACKAGE_NOERR
/* Sanity check */
assert(el);
assert(cb);
/* Iterate over events in list */
ev = (order == H5_ITER_DEC) ? el->tail : el->head;
while (ev) {
H5ES_event_t *tmp; /* Temporary event */
/* Get pointer to next node, so it's safe if this one is removed */
tmp = (order == H5_ITER_DEC) ? ev->prev : ev->next;
/* Perform iterator callback */
if ((ret_value = (*cb)(ev, ctx)) != H5_ITER_CONT) {
if (ret_value < 0)
HERROR(H5E_EVENTSET, H5E_CANTNEXT, "iteration operator failed");
break;
} /* end if */
/* Advance to next node */
ev = tmp;
} /* end while */
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5ES__list_iterate() */
/*-------------------------------------------------------------------------
* Function: H5ES__list_remove
*
* Purpose: Remove an event from an event list
*
* Return: SUCCEED / FAIL
*
*-------------------------------------------------------------------------
*/
void
H5ES__list_remove(H5ES_event_list_t *el, const H5ES_event_t *ev)
{
FUNC_ENTER_PACKAGE_NOERR
/* Sanity check */
assert(el);
assert(el->head);
assert(ev);
/* Stitch event out of list */
if (ev == el->head)
el->head = ev->next;
if (NULL != ev->next)
ev->next->prev = ev->prev;
if (NULL != ev->prev)
ev->prev->next = ev->next;
if (NULL == el->head)
el->tail = NULL;
/* Decrement the # of events in list */
el->count--;
FUNC_LEAVE_NOAPI_VOID
} /* end H5ES__list_remove() */
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