path: root/src/H5Cquery.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * 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 files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:     H5Cquery.c
 *              May 30 2016
 *              Quincey Koziol
 *
 * Purpose:     Routines which query different components of the generic
 *              cache structure or entries.
 *
 *-------------------------------------------------------------------------
 */

/****************/
/* Module Setup */
/****************/

#include "H5Cmodule.h"          /* This source code file is part of the H5C module */
#define H5F_FRIEND		/*suppress error about including H5Fpkg	  */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Cpkg.h"		/* Cache				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fpkg.h"		/* Files				*/


/****************/
/* Local Macros */
/****************/


/******************/
/* Local Typedefs */
/******************/


/********************/
/* Local Prototypes */
/********************/


/*********************/
/* Package Variables */
/*********************/


/*****************************/
/* Library Private Variables */
/*****************************/


/*******************/
/* Local Variables */
/*******************/



/*-------------------------------------------------------------------------
 * Function:    H5C_get_cache_auto_resize_config
 *
 * Purpose:	Copy the current configuration of the cache automatic
 *		re-sizing function into the instance of H5C_auto_size_ctl_t
 *		pointed to by config_ptr.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *		10/8/04
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_get_cache_auto_resize_config(const H5C_t * cache_ptr,
                                 H5C_auto_size_ctl_t *config_ptr)
{
    herr_t ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if((cache_ptr == NULL) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
    if(config_ptr == NULL)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad config_ptr on entry.")

    *config_ptr = cache_ptr->resize_ctl;

    config_ptr->set_initial_size = FALSE;
    config_ptr->initial_size = cache_ptr->max_cache_size;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_cache_auto_resize_config() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_cache_size
 *
 * Purpose:	Return the cache maximum size, the minimum clean size, the
 *		current size, and the current number of entries in
 *              *max_size_ptr, *min_clean_size_ptr, *cur_size_ptr, and
 *		*cur_num_entries_ptr respectively.  If any of these
 *		parameters are NULL, skip that value.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *		10/8/04
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_get_cache_size(H5C_t * cache_ptr,
                   size_t * max_size_ptr,
                   size_t * min_clean_size_ptr,
                   size_t * cur_size_ptr,
                   int32_t * cur_num_entries_ptr)
{
    herr_t ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if((cache_ptr == NULL) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")

    if(max_size_ptr != NULL)
        *max_size_ptr = cache_ptr->max_cache_size;

    if(min_clean_size_ptr != NULL)
        *min_clean_size_ptr = cache_ptr->min_clean_size;

    if(cur_size_ptr != NULL)
        *cur_size_ptr = cache_ptr->index_size;

    if(cur_num_entries_ptr != NULL)
        *cur_num_entries_ptr = cache_ptr->index_len;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_cache_size() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_cache_hit_rate
 *
 * Purpose:	Compute and return the current cache hit rate in
 *              *hit_rate_ptr.  If there have been no accesses since the
 *              last time the cache hit rate stats were reset, set
 *		*hit_rate_ptr to 0.0.  On error, *hit_rate_ptr is
 *		undefined.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *		10/7/04
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_get_cache_hit_rate(H5C_t * cache_ptr, double * hit_rate_ptr)
{
    herr_t ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if((cache_ptr == NULL) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
    if(hit_rate_ptr == NULL)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad hit_rate_ptr on entry.")

    HDassert(cache_ptr->cache_hits >= 0);
    HDassert(cache_ptr->cache_accesses >= cache_ptr->cache_hits);

    if(cache_ptr->cache_accesses > 0)
        *hit_rate_ptr = ((double)(cache_ptr->cache_hits)) /
                         ((double)(cache_ptr->cache_accesses));
    else
        *hit_rate_ptr = 0.0f;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_cache_hit_rate() */


/*-------------------------------------------------------------------------
 *
 * Function:    H5C_get_entry_status
 *
 * Purpose:     This function is used to determine whether the cache
 *		contains an entry with the specified base address.  If
 *		the entry exists, it also reports some status information
 *		on the entry.
 *
 *		Status information is reported in the locations pointed
 *		to by the size_ptr, in_cache_ptr, is_dirty_ptr, and
 *		is_protected_ptr.  While in_cache_ptr must be defined,
 *		the remaining pointers may be NULL, in which case the
 *		associated data is not reported.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              7/1/05
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_get_entry_status(const H5F_t *f,
                     haddr_t   addr,
                     size_t *  size_ptr,
                     hbool_t * in_cache_ptr,
                     hbool_t * is_dirty_ptr,
                     hbool_t * is_protected_ptr,
		     hbool_t * is_pinned_ptr,
		     hbool_t * is_corked_ptr,
		     hbool_t * is_flush_dep_parent_ptr,
                     hbool_t * is_flush_dep_child_ptr,
		     hbool_t * image_up_to_date_ptr)
{
    H5C_t             * cache_ptr;
    H5C_cache_entry_t *	entry_ptr = NULL;
    herr_t		ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);

    cache_ptr = f->shared->cache;

    HDassert(cache_ptr != NULL);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(H5F_addr_defined(addr));
    HDassert(in_cache_ptr != NULL);

    /* this test duplicates two of the above asserts, but we need an
     * invocation of HGOTO_ERROR to keep the compiler happy.
     */
    if((cache_ptr == NULL) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")

    H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL)

    if(entry_ptr == NULL) {
        /* the entry doesn't exist in the cache -- report this
         * and quit.
         */
        *in_cache_ptr = FALSE;
    } /* end if */
    else {
        *in_cache_ptr = TRUE;
        if(size_ptr != NULL)
            *size_ptr = entry_ptr->size;
        if(is_dirty_ptr != NULL)
            *is_dirty_ptr = entry_ptr->is_dirty;
        if(is_protected_ptr != NULL)
            *is_protected_ptr = entry_ptr->is_protected;
        if(is_pinned_ptr != NULL)
            *is_pinned_ptr = entry_ptr->is_pinned;
        if(is_corked_ptr != NULL)
            *is_corked_ptr = entry_ptr->tag_info ? entry_ptr->tag_info->corked : FALSE;
        if(is_flush_dep_parent_ptr != NULL)
            *is_flush_dep_parent_ptr = (entry_ptr->flush_dep_nchildren > 0);
        if(is_flush_dep_child_ptr != NULL)
            *is_flush_dep_child_ptr = (entry_ptr->flush_dep_nparents > 0);
        if(image_up_to_date_ptr != NULL )
            *image_up_to_date_ptr = entry_ptr->image_up_to_date;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_entry_status() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_evictions_enabled()
 *
 * Purpose:     Copy the current value of cache_ptr->evictions_enabled into
 *              *evictions_enabled_ptr.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *              7/27/07
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_get_evictions_enabled(const H5C_t *cache_ptr,
                          hbool_t * evictions_enabled_ptr)
{
    herr_t ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if((cache_ptr == NULL ) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")

    if(evictions_enabled_ptr == NULL)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad evictions_enabled_ptr on entry.")

    *evictions_enabled_ptr = cache_ptr->evictions_enabled;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_evictions_enabled() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_aux_ptr
 *
 * Purpose:     Get the aux_ptr field from the cache.
 *
 *              This field will either be NULL (when accessing a file serially)
 *              or contains a pointer to the auxiliary info for parallel I/O.
 *
 * Return:      NULL/non-NULL (can't fail)
 *
 * Programmer:  Quincey Koziol
 *              6/29/15
 *
 *-------------------------------------------------------------------------
 */
void *
H5C_get_aux_ptr(const H5C_t *cache_ptr)
{
    FUNC_ENTER_NOAPI_NOERR

    /* Check arguments */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);

    FUNC_LEAVE_NOAPI(cache_ptr->aux_ptr)
} /* H5C_get_aux_ptr() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_trace_file_ptr
 *
 * Purpose:     Get the trace_file_ptr field from the cache.
 *
 *              This field will either be NULL (which indicates that trace
 *              file logging is turned off), or contain a pointer to the
 *              open file to which trace file data is to be written.
 *
 * Return:      Non-NULL trace file pointer (can't fail)
 *
 * Programmer:  John Mainzer
 *              1/20/06
 *
 *-------------------------------------------------------------------------
 */
FILE *
H5C_get_trace_file_ptr(const H5C_t *cache_ptr)
{
    FUNC_ENTER_NOAPI_NOERR

    /* Check arguments */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);

    FUNC_LEAVE_NOAPI(cache_ptr->trace_file_ptr)
} /* H5C_get_trace_file_ptr() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_trace_file_ptr_from_entry
 *
 * Purpose:     Get the trace_file_ptr field from the cache, via an entry.
 *
 *              This field will either be NULL (which indicates that trace
 *              file logging is turned off), or contain a pointer to the
 *              open file to which trace file data is to be written.
 *
 * Return:      Non-NULL trace file pointer (can't fail)
 *
 * Programmer:  Quincey Koziol
 *              6/9/08
 *
 *-------------------------------------------------------------------------
 */
FILE *
H5C_get_trace_file_ptr_from_entry(const H5C_cache_entry_t *entry_ptr)
{
    FUNC_ENTER_NOAPI_NOERR

    /* Sanity checks */
    HDassert(entry_ptr);
    HDassert(entry_ptr->cache_ptr);

    FUNC_LEAVE_NOAPI(H5C_get_trace_file_ptr(entry_ptr->cache_ptr))
} /* H5C_get_trace_file_ptr_from_entry() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_entry_ring
 *
 * Purpose:     Given a file address, retrieve the ring for an entry at that
 *              address.
 *
 * 		On error, the value of *ring is not modified.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              9/8/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_get_entry_ring(const H5F_t *f, haddr_t addr, H5C_ring_t *ring)
{
    H5C_t *cache_ptr;                   /* Pointer to cache */
    H5C_cache_entry_t *entry_ptr;       /* Pointer to cache entry at address */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    cache_ptr = f->shared->cache;
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(H5F_addr_defined(addr));

    /* Locate the entry at the address */
    H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL)
    HDassert(entry_ptr);

    /* Return the ring value */
    *ring = entry_ptr->ring;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_entry_ring() */