AOO410/main/sal/rtl/source/alloc_cache.c

/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#include "alloc_cache.h"
#include "alloc_impl.h"
#include "alloc_arena.h"
#include "internal/once.h"
#include "sal/macros.h"
#include "osl/diagnose.h"

#ifndef INCLUDED_STRING_H
#include <string.h>
#endif

#ifndef INCLUDED_STDIO_H
#include <stdio.h>
#endif

#ifdef OS2
#undef OSL_TRACE
#define OSL_TRACE                  1 ? ((void)0) : _OSL_GLOBAL osl_trace

#define INCL_DOS
#include <os2.h>

#endif

/* ================================================================= *
 *
 * cache internals.
 *
 * ================================================================= */

/** g_cache_list
 *  @internal
 */
struct rtl_cache_list_st
{
	rtl_memory_lock_type m_lock;
	rtl_cache_type       m_cache_head;

#if defined(SAL_UNX)
	pthread_t            m_update_thread;
	pthread_cond_t       m_update_cond;
#elif defined(SAL_OS2)
	TID                  m_update_thread;
	HEV                  m_update_cond;
#elif defined(SAL_W32)
	HANDLE               m_update_thread;
	HANDLE               m_update_cond;
#endif /* SAL_UNX || SAL_W32 */
	int                  m_update_done;
};

static struct rtl_cache_list_st g_cache_list;


/** gp_cache_arena
 *  provided for cache_type allocations, and hash_table resizing.
 *
 *  @internal
 */
static rtl_arena_type * gp_cache_arena = 0;


/** gp_cache_magazine_cache
 *  @internal
 */
static rtl_cache_type * gp_cache_magazine_cache = 0;


/** gp_cache_slab_cache
 *  @internal
 */
static rtl_cache_type * gp_cache_slab_cache = 0;


/** gp_cache_bufctl_cache
 *  @internal
 */
static rtl_cache_type * gp_cache_bufctl_cache = 0;


/** rtl_cache_init()
 *  @internal
 */
static int
rtl_cache_init (void);


/* ================================================================= */

/** RTL_CACHE_HASH_INDEX()
 */
#define	RTL_CACHE_HASH_INDEX_IMPL(a, s, q, m) \
 	((((a) + ((a) >> (s)) + ((a) >> ((s) << 1))) >> (q)) & (m))
 
#define	RTL_CACHE_HASH_INDEX(cache, addr) \
    RTL_CACHE_HASH_INDEX_IMPL((addr), (cache)->m_hash_shift, (cache)->m_type_shift, ((cache)->m_hash_size - 1))


/** rtl_cache_hash_rescale()
 */
static void
rtl_cache_hash_rescale (
	rtl_cache_type * cache,
	sal_Size         new_size
)
{
	rtl_cache_bufctl_type ** new_table;
	sal_Size                 new_bytes;

	new_bytes = new_size * sizeof(rtl_cache_bufctl_type*);
	new_table = (rtl_cache_bufctl_type**)rtl_arena_alloc(gp_cache_arena, &new_bytes);

	if (new_table != 0)
	{
		rtl_cache_bufctl_type ** old_table;
		sal_Size                 old_size, i;

		memset (new_table, 0, new_bytes);

		RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_slab_lock));

		old_table = cache->m_hash_table;
		old_size  = cache->m_hash_size;

		OSL_TRACE(
			"rtl_cache_hash_rescale(\"%s\"): "
			"nbuf: % " PRIu64 " (ave: %" PRIu64 "), frees: %" PRIu64 " "
			"[old_size: %lu, new_size: %lu]",
			cache->m_name,
			cache->m_slab_stats.m_alloc - cache->m_slab_stats.m_free,
			(cache->m_slab_stats.m_alloc - cache->m_slab_stats.m_free) >> cache->m_hash_shift,
			cache->m_slab_stats.m_free,
			old_size, new_size);

		cache->m_hash_table = new_table;
		cache->m_hash_size  = new_size;
		cache->m_hash_shift = highbit(cache->m_hash_size) - 1;

		for (i = 0; i < old_size; i++)
		{
			rtl_cache_bufctl_type * curr = old_table[i];
			while (curr != 0)
			{
				rtl_cache_bufctl_type  * next = curr->m_next;
				rtl_cache_bufctl_type ** head;

				head = &(cache->m_hash_table[RTL_CACHE_HASH_INDEX(cache, curr->m_addr)]);
				curr->m_next = (*head);
				(*head) = curr;

				curr = next;
			}
			old_table[i] = 0;
		}

		RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));

		if (old_table != cache->m_hash_table_0)
		{
			sal_Size old_bytes = old_size * sizeof(rtl_cache_bufctl_type*);
			rtl_arena_free (gp_cache_arena, old_table, old_bytes);
		}
	}
}

/** rtl_cache_hash_insert()
 */
static RTL_MEMORY_INLINE sal_uIntPtr
rtl_cache_hash_insert (
	rtl_cache_type *        cache,
	rtl_cache_bufctl_type * bufctl
)
{
	rtl_cache_bufctl_type ** ppHead;

	ppHead = &(cache->m_hash_table[RTL_CACHE_HASH_INDEX(cache, bufctl->m_addr)]);

	bufctl->m_next = (*ppHead);
	(*ppHead) = bufctl;

	return (bufctl->m_addr);
}

#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#pragma inline(rtl_cache_hash_insert)
#endif /* __SUNPRO_C */


/** rtl_cache_hash_remove()
 */
static rtl_cache_bufctl_type *
rtl_cache_hash_remove (
	rtl_cache_type * cache,
	sal_uIntPtr      addr
)
{
	rtl_cache_bufctl_type ** ppHead;
	rtl_cache_bufctl_type  * bufctl;
	sal_Size                 lookups = 0;

	ppHead = &(cache->m_hash_table[RTL_CACHE_HASH_INDEX(cache, addr)]);
	while ((bufctl = *ppHead) != 0)
	{
		if (bufctl->m_addr == addr)
		{
			*ppHead = bufctl->m_next, bufctl->m_next = 0;
			break;
		}

		lookups += 1;
		ppHead = &(bufctl->m_next);
	}

	OSL_ASSERT (bufctl != 0); /* bad free */

	if (lookups > 1)
	{
		sal_Size nbuf = (sal_Size)(cache->m_slab_stats.m_alloc - cache->m_slab_stats.m_free);
		if (nbuf > 4 * cache->m_hash_size)
		{
			if (!(cache->m_features & RTL_CACHE_FEATURE_RESCALE))
			{
				sal_Size ave = nbuf >> cache->m_hash_shift;
				sal_Size new_size = cache->m_hash_size << (highbit(ave) - 1);

				cache->m_features |= RTL_CACHE_FEATURE_RESCALE;
				RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
				rtl_cache_hash_rescale (cache, new_size);
				RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_slab_lock));
				cache->m_features &= ~RTL_CACHE_FEATURE_RESCALE;
			}
		}
	}

	return (bufctl);
}

/* ================================================================= */

/** RTL_CACHE_SLAB()
 */
#define RTL_CACHE_SLAB(addr, size) \
    (((rtl_cache_slab_type*)(RTL_MEMORY_P2END((sal_uIntPtr)(addr), (size)))) - 1)


/** rtl_cache_slab_constructor()
 */
static int
rtl_cache_slab_constructor (void * obj, void * arg)
{
	rtl_cache_slab_type * slab = (rtl_cache_slab_type*)(obj);

    (void) arg; /* unused */

	QUEUE_START_NAMED(slab, slab_);
	slab->m_ntypes = 0;

	return (1);
}


/** rtl_cache_slab_destructor()
 */
static void
rtl_cache_slab_destructor (void * obj, void * arg)
{
#if OSL_DEBUG_LEVEL == 0
    (void) obj; /* unused */
#else /* OSL_DEBUG_LEVEL */
	rtl_cache_slab_type * slab = (rtl_cache_slab_type*)(obj);

	/* assure removed from queue(s) */
	OSL_ASSERT(QUEUE_STARTED_NAMED(slab, slab_));

	/* assure no longer referenced */
	OSL_ASSERT(slab->m_ntypes == 0);
#endif /* OSL_DEBUG_LEVEL */

    (void) arg; /* unused */
}


/** rtl_cache_slab_create()
 *
 *  @precond cache->m_slab_lock released.
 */
static rtl_cache_slab_type *
rtl_cache_slab_create (
	rtl_cache_type * cache
)
{
	rtl_cache_slab_type * slab = 0;
	void *                addr;
	sal_Size              size;

	size = cache->m_slab_size;
	addr = rtl_arena_alloc (cache->m_source, &size);
	if (addr != 0)
	{
		OSL_ASSERT(size >= cache->m_slab_size);

		if (cache->m_features & RTL_CACHE_FEATURE_HASH)
		{
			/* allocate slab struct from slab cache */
			OSL_ASSERT (cache != gp_cache_slab_cache);
			slab = (rtl_cache_slab_type*)rtl_cache_alloc (gp_cache_slab_cache);
		}
		else
		{
			/* construct embedded slab struct */
			slab = RTL_CACHE_SLAB(addr, cache->m_slab_size);
			(void) rtl_cache_slab_constructor (slab, 0);
		}
		if (slab != 0)
		{
			slab->m_data = (sal_uIntPtr)(addr);

			/* dynamic freelist initialization */
			slab->m_bp = slab->m_data;
			slab->m_sp = 0;
		}
		else
		{
			rtl_arena_free (cache->m_source, addr, size);
		}
	}
	return (slab);
}


/** rtl_cache_slab_destroy()
 *
 *  @precond cache->m_slab_lock released.
 */
static void
rtl_cache_slab_destroy (
	rtl_cache_type *      cache,
	rtl_cache_slab_type * slab
)
{
	void *   addr   = (void*)(slab->m_data);
	sal_Size refcnt = slab->m_ntypes; slab->m_ntypes = 0;

	if (cache->m_features & RTL_CACHE_FEATURE_HASH)
	{
		/* cleanup bufctl(s) for free buffer(s) */
		sal_Size ntypes = (slab->m_bp - slab->m_data) / cache->m_type_size;
		for (ntypes -= refcnt; slab->m_sp != 0; ntypes--)
		{
			rtl_cache_bufctl_type * bufctl = slab->m_sp;

			/* pop from freelist */
			slab->m_sp = bufctl->m_next, bufctl->m_next = 0;

			/* return bufctl struct to bufctl cache */
			rtl_cache_free (gp_cache_bufctl_cache, bufctl);
		}
		OSL_ASSERT(ntypes == 0);

		/* return slab struct to slab cache */
		rtl_cache_free (gp_cache_slab_cache, slab);
	}
	else
	{
		/* destruct embedded slab struct */
		rtl_cache_slab_destructor (slab, 0);
	}

	if ((refcnt == 0) || (cache->m_features & RTL_CACHE_FEATURE_BULKDESTROY))
	{
		/* free memory */
		rtl_arena_free (cache->m_source, addr, cache->m_slab_size);
	}
}


/** rtl_cache_slab_populate()
 *
 *  @precond cache->m_slab_lock acquired.
 */
static int
rtl_cache_slab_populate (
	rtl_cache_type * cache
)
{
	rtl_cache_slab_type * slab;

	RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
	slab = rtl_cache_slab_create (cache);
	RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_slab_lock));
	if (slab != 0)
	{
		/* update buffer start addr w/ current color */
		slab->m_bp += cache->m_ncolor;

		/* update color for next slab */
		cache->m_ncolor += cache->m_type_align;
		if (cache->m_ncolor > cache->m_ncolor_max)
			cache->m_ncolor = 0;

		/* update stats */
		cache->m_slab_stats.m_mem_total += cache->m_slab_size;

		/* insert onto 'free' queue */
		QUEUE_INSERT_HEAD_NAMED(&(cache->m_free_head), slab, slab_);
	}
	return (slab != 0);
}

/* ================================================================= */

/** rtl_cache_slab_alloc()
 *
 *  Allocate a buffer from slab layer; used by magazine layer.
 */
static void *
rtl_cache_slab_alloc (
	rtl_cache_type * cache
)
{
	void                * addr = 0;
	rtl_cache_slab_type * head;

	RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_slab_lock));

	head = &(cache->m_free_head);
	if ((head->m_slab_next != head) || rtl_cache_slab_populate (cache))
	{
		rtl_cache_slab_type   * slab;
		rtl_cache_bufctl_type * bufctl;

		slab = head->m_slab_next;
		OSL_ASSERT(slab->m_ntypes < cache->m_ntypes);

		if (slab->m_sp == 0)
		{
			/* initialize bufctl w/ current 'slab->m_bp' */
			OSL_ASSERT (slab->m_bp < slab->m_data + cache->m_ntypes * cache->m_type_size + cache->m_ncolor_max);
			if (cache->m_features & RTL_CACHE_FEATURE_HASH)
			{
				/* allocate bufctl */
				OSL_ASSERT (cache != gp_cache_bufctl_cache);
				bufctl = (rtl_cache_bufctl_type*)rtl_cache_alloc (gp_cache_bufctl_cache);
				if (bufctl == 0)
				{
					/* out of memory */
					RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
					return (0);
				}

				bufctl->m_addr = slab->m_bp;
				bufctl->m_slab = (sal_uIntPtr)(slab);
			}
			else
			{
				/* embedded bufctl */
				bufctl = (rtl_cache_bufctl_type*)(slab->m_bp);
			}
			bufctl->m_next = 0;

			/* update 'slab->m_bp' to next free buffer */
			slab->m_bp += cache->m_type_size;

			/* assign bufctl to freelist */
			slab->m_sp = bufctl;
		}

		/* pop front */
		bufctl = slab->m_sp;
		slab->m_sp = bufctl->m_next;

		/* increment usage, check for full slab */
		if ((slab->m_ntypes += 1) == cache->m_ntypes)
		{
			/* remove from 'free' queue */
			QUEUE_REMOVE_NAMED(slab, slab_);

			/* insert onto 'used' queue (tail) */
			QUEUE_INSERT_TAIL_NAMED(&(cache->m_used_head), slab, slab_);
		}

		/* update stats */
		cache->m_slab_stats.m_alloc     += 1;
		cache->m_slab_stats.m_mem_alloc += cache->m_type_size;

		if (cache->m_features & RTL_CACHE_FEATURE_HASH)
			addr = (void*)rtl_cache_hash_insert (cache, bufctl);
		else
			addr = bufctl;

		/* DEBUG ONLY: mark allocated, undefined */
		OSL_DEBUG_ONLY(memset(addr, 0x77777777, cache->m_type_size));
		VALGRIND_MEMPOOL_ALLOC(cache, addr, cache->m_type_size);
	}

	RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
	return (addr);
}


/** rtl_cache_slab_free()
 *
 *  Return a buffer to slab layer; used by magazine layer.
 */
static void
rtl_cache_slab_free (
	rtl_cache_type * cache,
	void *           addr
)
{
	rtl_cache_bufctl_type * bufctl;
	rtl_cache_slab_type   * slab;

	RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_slab_lock));

	/* DEBUG ONLY: mark unallocated, undefined */
	VALGRIND_MEMPOOL_FREE(cache, addr);
	/* OSL_DEBUG_ONLY() */ VALGRIND_MAKE_MEM_UNDEFINED(addr, cache->m_type_size);
    OSL_DEBUG_ONLY(memset(addr, 0x33333333, cache->m_type_size));

	/* determine slab from addr */
	if (cache->m_features & RTL_CACHE_FEATURE_HASH)
	{
		bufctl = rtl_cache_hash_remove (cache, (sal_uIntPtr)(addr));
		slab = (bufctl != 0) ? (rtl_cache_slab_type*)(bufctl->m_slab) : 0;
	}
	else
	{
		/* embedded slab struct */
		bufctl = (rtl_cache_bufctl_type*)(addr);
		slab = RTL_CACHE_SLAB(addr, cache->m_slab_size);
	}

	if (slab != 0)
	{
		/* check for full slab */
		if (slab->m_ntypes == cache->m_ntypes)
		{
			/* remove from 'used' queue */
			QUEUE_REMOVE_NAMED(slab, slab_);

			/* insert onto 'free' queue (head) */
			QUEUE_INSERT_HEAD_NAMED(&(cache->m_free_head), slab, slab_);
		}

		/* push front */
		bufctl->m_next = slab->m_sp;
		slab->m_sp = bufctl;

		/* update stats */
		cache->m_slab_stats.m_free      += 1;
		cache->m_slab_stats.m_mem_alloc -= cache->m_type_size;

		/* decrement usage, check for empty slab */
		if ((slab->m_ntypes -= 1) == 0)
		{
			/* remove from 'free' queue */
			QUEUE_REMOVE_NAMED(slab, slab_);

			/* update stats */
			cache->m_slab_stats.m_mem_total -= cache->m_slab_size;

			/* free 'empty' slab */
			RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
			rtl_cache_slab_destroy (cache, slab);
			return;
		}
	}

	RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
}

/* ================================================================= */

/** rtl_cache_magazine_constructor()
 */
static int
rtl_cache_magazine_constructor (void * obj, void * arg)
{
	rtl_cache_magazine_type * mag = (rtl_cache_magazine_type*)(obj);
	/* @@@ sal_Size size = (sal_Size)(arg); @@@ */

    (void) arg; /* unused */

	mag->m_mag_next = 0;
	mag->m_mag_size = RTL_CACHE_MAGAZINE_SIZE;
	mag->m_mag_used = 0;

	return (1);
}


/** rtl_cache_magazine_destructor()
 */
static void
rtl_cache_magazine_destructor (void * obj, void * arg)
{
#if OSL_DEBUG_LEVEL == 0
    (void) obj; /* unused */
#else /* OSL_DEBUG_LEVEL */
	rtl_cache_magazine_type * mag = (rtl_cache_magazine_type*)(obj);

	/* assure removed from queue(s) */
	OSL_ASSERT(mag->m_mag_next == 0);

	/* assure no longer referenced */
	OSL_ASSERT(mag->m_mag_used == 0);
#endif /* OSL_DEBUG_LEVEL */

    (void) arg; /* unused */
}


/** rtl_cache_magazine_clear()
 */
static void
rtl_cache_magazine_clear (
	rtl_cache_type *          cache,
	rtl_cache_magazine_type * mag
)
{
	for (; mag->m_mag_used > 0; --mag->m_mag_used)
	{
		void * obj = mag->m_objects[mag->m_mag_used - 1];
		mag->m_objects[mag->m_mag_used - 1] = 0;

        /* DEBUG ONLY: mark cached object allocated, undefined */
        VALGRIND_MEMPOOL_ALLOC(cache, obj, cache->m_type_size);
		if (cache->m_destructor != 0)
		{
            /* DEBUG ONLY: keep constructed object defined */
            VALGRIND_MAKE_MEM_DEFINED(obj, cache->m_type_size);

			/* destruct object */
			(cache->m_destructor)(obj, cache->m_userarg);
		}

		/* return buffer to slab layer */
		rtl_cache_slab_free (cache, obj);
	}
}

/* ================================================================= */

/** rtl_cache_depot_enqueue()
 *
 *  @precond cache->m_depot_lock acquired.
 */
static RTL_MEMORY_INLINE void
rtl_cache_depot_enqueue (
	rtl_cache_depot_type *    depot,
	rtl_cache_magazine_type * mag
)
{
	/* enqueue empty magazine */
	mag->m_mag_next = depot->m_mag_next;
	depot->m_mag_next = mag;

	/* update depot stats */
	depot->m_mag_count++;
}

#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#pragma inline(rtl_cache_depot_enqueue)
#endif /* __SUNPRO_C */


/** rtl_cache_depot_dequeue()
 *
 *  @precond cache->m_depot_lock acquired.
 */
static RTL_MEMORY_INLINE rtl_cache_magazine_type *
rtl_cache_depot_dequeue (
	rtl_cache_depot_type * depot
)
{
	rtl_cache_magazine_type * mag = 0;
	if (depot->m_mag_count > 0)
	{
		/* dequeue magazine */
		OSL_ASSERT(depot->m_mag_next != 0);

		mag = depot->m_mag_next;
		depot->m_mag_next = mag->m_mag_next;
		mag->m_mag_next = 0;

		/* update depot stats */
		depot->m_mag_count--;
		depot->m_curr_min = SAL_MIN(depot->m_curr_min, depot->m_mag_count);
	}
	return (mag);
}

#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#pragma inline(rtl_cache_depot_dequeue)
#endif /* __SUNPRO_C */


/** rtl_cache_depot_exchange_alloc()
 *
 *  @precond cache->m_depot_lock acquired.
 */
static RTL_MEMORY_INLINE rtl_cache_magazine_type *
rtl_cache_depot_exchange_alloc (
	rtl_cache_type *          cache,
	rtl_cache_magazine_type * empty
)
{
	rtl_cache_magazine_type * full;

	OSL_ASSERT((empty == 0) || (empty->m_mag_used == 0));

	/* dequeue full magazine */
	full = rtl_cache_depot_dequeue (&(cache->m_depot_full));
	if ((full != 0) && (empty != 0))
	{
		/* enqueue empty magazine */
		rtl_cache_depot_enqueue (&(cache->m_depot_empty), empty);
	}

	OSL_ASSERT((full == 0) || (full->m_mag_used > 0));

	return (full);
}

#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#pragma inline(rtl_cache_depot_exchange_alloc)
#endif /* __SUNPRO_C */


/** rtl_cache_depot_exchange_free()
 *
 *  @precond cache->m_depot_lock acquired.
 */
static RTL_MEMORY_INLINE rtl_cache_magazine_type *
rtl_cache_depot_exchange_free (
	rtl_cache_type *          cache,
	rtl_cache_magazine_type * full
)
{
	rtl_cache_magazine_type * empty;

	OSL_ASSERT((full == 0) || (full->m_mag_used > 0));

	/* dequeue empty magazine */
	empty = rtl_cache_depot_dequeue (&(cache->m_depot_empty));
	if ((empty != 0) && (full != 0))
	{
		/* enqueue full magazine */
		rtl_cache_depot_enqueue (&(cache->m_depot_full), full);
	}

	OSL_ASSERT((empty == 0) || (empty->m_mag_used == 0));

	return (empty);
}

#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#pragma inline(rtl_cache_depot_exchange_free)
#endif /* __SUNPRO_C */


/** rtl_cache_depot_populate()
 *
 *  @precond cache->m_depot_lock acquired.
 */
static int
rtl_cache_depot_populate (
	rtl_cache_type * cache
)
{
	rtl_cache_magazine_type * empty = 0;

	if (cache->m_magazine_cache != 0)
	{
		/* allocate new empty magazine */
		RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
		empty = (rtl_cache_magazine_type*)rtl_cache_alloc (cache->m_magazine_cache);
		RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));
		if (empty != 0)
		{
			/* enqueue (new) empty magazine */
			rtl_cache_depot_enqueue (&(cache->m_depot_empty), empty);
		}
    }
	return (empty != 0);
}

/* ================================================================= */

/** rtl_cache_constructor()
 */
static int
rtl_cache_constructor (void * obj)
{
	rtl_cache_type * cache = (rtl_cache_type*)(obj);

	memset (cache, 0, sizeof(rtl_cache_type));

	/* linkage */
	QUEUE_START_NAMED(cache, cache_);

	/* slab layer */
	(void)RTL_MEMORY_LOCK_INIT(&(cache->m_slab_lock));

	QUEUE_START_NAMED(&(cache->m_free_head), slab_);
	QUEUE_START_NAMED(&(cache->m_used_head), slab_);

	cache->m_hash_table = cache->m_hash_table_0;
	cache->m_hash_size  = RTL_CACHE_HASH_SIZE;
	cache->m_hash_shift = highbit(cache->m_hash_size) - 1;

	/* depot layer */
	(void)RTL_MEMORY_LOCK_INIT(&(cache->m_depot_lock));

	return (1);
}

/** rtl_cache_destructor()
 */
static void
rtl_cache_destructor (void * obj)
{
	rtl_cache_type * cache = (rtl_cache_type*)(obj);

	/* linkage */
	OSL_ASSERT(QUEUE_STARTED_NAMED(cache, cache_));

	/* slab layer */
	(void)RTL_MEMORY_LOCK_DESTROY(&(cache->m_slab_lock));

	OSL_ASSERT(QUEUE_STARTED_NAMED(&(cache->m_free_head), slab_));
	OSL_ASSERT(QUEUE_STARTED_NAMED(&(cache->m_used_head), slab_));

	OSL_ASSERT(cache->m_hash_table == cache->m_hash_table_0);
	OSL_ASSERT(cache->m_hash_size  == RTL_CACHE_HASH_SIZE);
	OSL_ASSERT(cache->m_hash_shift == (sal_Size)(highbit(cache->m_hash_size) - 1));

	/* depot layer */
	(void)RTL_MEMORY_LOCK_DESTROY(&(cache->m_depot_lock));
}

/* ================================================================= */

/** rtl_cache_activate()
 */
static rtl_cache_type *
rtl_cache_activate (
    rtl_cache_type * cache,
    const char *     name,
    size_t           objsize,
    size_t           objalign,
    int  (SAL_CALL * constructor)(void * obj, void * userarg),
    void (SAL_CALL * destructor) (void * obj, void * userarg),
	void (SAL_CALL * reclaim)    (void * userarg),
    void *           userarg,
    rtl_arena_type * source,
    int              flags
)
{
	OSL_ASSERT(cache != 0);
	if (cache != 0)
	{
		sal_Size slabsize;

		snprintf (cache->m_name, sizeof(cache->m_name), "%s", name);

		/* ensure minimum size (embedded bufctl linkage) */
		objsize = SAL_MAX(objsize, sizeof(rtl_cache_bufctl_type*));

		if (objalign == 0)
		{
			/* determine default alignment */
			if (objsize >= RTL_MEMORY_ALIGNMENT_8)
				objalign = RTL_MEMORY_ALIGNMENT_8;
			else
				objalign = RTL_MEMORY_ALIGNMENT_4;
		}
		else
		{
			/* ensure minimum alignment */
			objalign = SAL_MAX(objalign, RTL_MEMORY_ALIGNMENT_4);
		}
		OSL_ASSERT(RTL_MEMORY_ISP2(objalign));

		cache->m_type_size  = objsize = RTL_MEMORY_P2ROUNDUP(objsize, objalign);
		cache->m_type_align = objalign;
		cache->m_type_shift = highbit(cache->m_type_size) - 1;

		cache->m_constructor = constructor;
		cache->m_destructor  = destructor;
		cache->m_reclaim     = reclaim;
		cache->m_userarg     = userarg;

		/* slab layer */
		cache->m_source = source;

		slabsize = source->m_quantum; /* minimum slab size */
		if (flags & RTL_CACHE_FLAG_QUANTUMCACHE)
		{
			/* next power of 2 above 3 * qcache_max */
			slabsize = SAL_MAX(slabsize, (1UL << highbit(3 * source->m_qcache_max)));
		}
		else
		{
		    /* waste at most 1/8 of slab */
		    slabsize = SAL_MAX(slabsize, cache->m_type_size * 8);
		}

		slabsize = RTL_MEMORY_P2ROUNDUP(slabsize, source->m_quantum);
		if (!RTL_MEMORY_ISP2(slabsize))
			slabsize = 1UL << highbit(slabsize);
		cache->m_slab_size = slabsize;

		if (cache->m_slab_size > source->m_quantum)
		{
			OSL_ASSERT(gp_cache_slab_cache != 0);
			OSL_ASSERT(gp_cache_bufctl_cache != 0);

			cache->m_features  |= RTL_CACHE_FEATURE_HASH;
			cache->m_ntypes     = cache->m_slab_size / cache->m_type_size;
			cache->m_ncolor_max = cache->m_slab_size % cache->m_type_size;
		}
		else
		{
			/* embedded slab struct */
			cache->m_ntypes     = (cache->m_slab_size - sizeof(rtl_cache_slab_type)) / cache->m_type_size;
			cache->m_ncolor_max = (cache->m_slab_size - sizeof(rtl_cache_slab_type)) % cache->m_type_size;
		}

		OSL_ASSERT(cache->m_ntypes > 0);
		cache->m_ncolor = 0;

		if (flags & RTL_CACHE_FLAG_BULKDESTROY)
		{
			/* allow bulk slab delete upon cache deactivation */
			cache->m_features |= RTL_CACHE_FEATURE_BULKDESTROY;
		}

		/* magazine layer */
		if (!(flags & RTL_CACHE_FLAG_NOMAGAZINE))
		{
			OSL_ASSERT(gp_cache_magazine_cache != 0);
			cache->m_magazine_cache = gp_cache_magazine_cache;
		}

		/* insert into cache list */
		RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
		QUEUE_INSERT_TAIL_NAMED(&(g_cache_list.m_cache_head), cache, cache_);
		RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
	}
	return (cache);
}

/** rtl_cache_deactivate()
 */
static void
rtl_cache_deactivate (
    rtl_cache_type * cache
)
{
	int active = 1;

	/* remove from cache list */
	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	active = QUEUE_STARTED_NAMED(cache, cache_) == 0;
	QUEUE_REMOVE_NAMED(cache, cache_);
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));

	OSL_PRECOND(active, "rtl_cache_deactivate(): orphaned cache.");

	/* cleanup magazine layer */
	if (cache->m_magazine_cache != 0)
	{
		rtl_cache_type *          mag_cache;
		rtl_cache_magazine_type * mag;

		/* prevent recursion */
		mag_cache = cache->m_magazine_cache, cache->m_magazine_cache = 0;

		/* cleanup cpu layer */
		if ((mag = cache->m_cpu_curr) != 0)
		{
			cache->m_cpu_curr = 0;
			rtl_cache_magazine_clear (cache, mag);
			rtl_cache_free (mag_cache, mag);
		}
		if ((mag = cache->m_cpu_prev) != 0)
		{
			cache->m_cpu_prev = 0;
			rtl_cache_magazine_clear (cache, mag);
			rtl_cache_free (mag_cache, mag);
		}

		/* cleanup depot layer */
		while ((mag = rtl_cache_depot_dequeue(&(cache->m_depot_full))) != 0)
		{
			rtl_cache_magazine_clear (cache, mag);
			rtl_cache_free (mag_cache, mag);
		}
		while ((mag = rtl_cache_depot_dequeue(&(cache->m_depot_empty))) != 0)
		{
			rtl_cache_magazine_clear (cache, mag);
			rtl_cache_free (mag_cache, mag);
		}
	}

	OSL_TRACE(
		"rtl_cache_deactivate(\"%s\"): "
		"[slab]: allocs: %"PRIu64", frees: %"PRIu64"; total: %lu, used: %lu; "
		"[cpu]: allocs: %"PRIu64", frees: %"PRIu64"; "
		"[total]: allocs: %"PRIu64", frees: %"PRIu64"",
		cache->m_name,
		cache->m_slab_stats.m_alloc, cache->m_slab_stats.m_free,
		cache->m_slab_stats.m_mem_total, cache->m_slab_stats.m_mem_alloc,
		cache->m_cpu_stats.m_alloc, cache->m_cpu_stats.m_free,
		cache->m_slab_stats.m_alloc + cache->m_cpu_stats.m_alloc,
		cache->m_slab_stats.m_free  + cache->m_cpu_stats.m_free
	);

	/* cleanup slab layer */
	if (cache->m_slab_stats.m_alloc > cache->m_slab_stats.m_free)
	{
		OSL_TRACE(
			"rtl_cache_deactivate(\"%s\"): "
			"cleaning up %"PRIu64" leaked buffer(s) [%lu bytes] [%lu total]",
			cache->m_name,
			cache->m_slab_stats.m_alloc - cache->m_slab_stats.m_free,
			cache->m_slab_stats.m_mem_alloc, cache->m_slab_stats.m_mem_total
		);

		if (cache->m_features & RTL_CACHE_FEATURE_HASH)
		{
			/* cleanup bufctl(s) for leaking buffer(s) */
			sal_Size i, n = cache->m_hash_size;
			for (i = 0; i < n; i++)
			{
				rtl_cache_bufctl_type * bufctl;
				while ((bufctl = cache->m_hash_table[i]) != 0)
				{
					/* pop from hash table */
					cache->m_hash_table[i] = bufctl->m_next, bufctl->m_next = 0;

					/* return to bufctl cache */
					rtl_cache_free (gp_cache_bufctl_cache, bufctl);
				}
			}
		}
		{
			/* force cleanup of remaining slabs */
			rtl_cache_slab_type *head, *slab;

			head = &(cache->m_used_head);
			for (slab = head->m_slab_next; slab != head; slab = head->m_slab_next)
			{
				/* remove from 'used' queue */
				QUEUE_REMOVE_NAMED(slab, slab_);

				/* update stats */
				cache->m_slab_stats.m_mem_total -= cache->m_slab_size;

				/* free slab */
				rtl_cache_slab_destroy (cache, slab);
			}

			head = &(cache->m_free_head);
			for (slab = head->m_slab_next; slab != head; slab = head->m_slab_next)
			{
				/* remove from 'free' queue */
				QUEUE_REMOVE_NAMED(slab, slab_);

				/* update stats */
				cache->m_slab_stats.m_mem_total -= cache->m_slab_size;

				/* free slab */
				rtl_cache_slab_destroy (cache, slab);
			}
		}
	}

	if (cache->m_hash_table != cache->m_hash_table_0)
	{
		rtl_arena_free (
			gp_cache_arena,
			cache->m_hash_table,
			cache->m_hash_size * sizeof(rtl_cache_bufctl_type*));

		cache->m_hash_table = cache->m_hash_table_0;
		cache->m_hash_size  = RTL_CACHE_HASH_SIZE;
		cache->m_hash_shift = highbit(cache->m_hash_size) - 1;
	}
}

/* ================================================================= *
 *
 * cache implementation.
 *
 * ================================================================= */

/** rtl_cache_create()
 */
rtl_cache_type *
SAL_CALL rtl_cache_create (
    const char *     name,
    sal_Size         objsize,
    sal_Size         objalign,
    int  (SAL_CALL * constructor)(void * obj, void * userarg),
    void (SAL_CALL * destructor) (void * obj, void * userarg),
	void (SAL_CALL * reclaim)    (void * userarg),
    void *           userarg,
    rtl_arena_type * source,
    int              flags
) SAL_THROW_EXTERN_C()
{
	rtl_cache_type * result = 0;
	sal_Size         size   = sizeof(rtl_cache_type);

try_alloc:
	result = (rtl_cache_type*)rtl_arena_alloc (gp_cache_arena, &size);
	if (result != 0)
	{
		rtl_cache_type * cache = result;
		VALGRIND_CREATE_MEMPOOL(cache, 0, 0);
		(void) rtl_cache_constructor (cache);

		if (!source)
		{
			/* use default arena */
			OSL_ASSERT(gp_default_arena != 0);
			source = gp_default_arena;
		}

		result = rtl_cache_activate (
			cache,
			name,
			objsize,
			objalign,
			constructor,
			destructor,
			reclaim,
			userarg,
			source,
			flags
		);

		if (result == 0)
		{
			/* activation failed */
			rtl_cache_deactivate (cache);
			rtl_cache_destructor (cache);
			VALGRIND_DESTROY_MEMPOOL(cache);
			rtl_arena_free (gp_cache_arena, cache, size);
		}
	}
	else if (gp_cache_arena == 0)
	{
		if (rtl_cache_init())
		{
			/* try again */
			goto try_alloc;
		}
	}
	return (result);
}

/** rtl_cache_destroy()
 */
void SAL_CALL rtl_cache_destroy (
    rtl_cache_type * cache
) SAL_THROW_EXTERN_C()
{
	if (cache != 0)
	{
		rtl_cache_deactivate (cache);
		rtl_cache_destructor (cache);
		VALGRIND_DESTROY_MEMPOOL(cache);
		rtl_arena_free (gp_cache_arena, cache, sizeof(rtl_cache_type));
	}
}

/** rtl_cache_alloc()
 */
void *
SAL_CALL rtl_cache_alloc (
    rtl_cache_type * cache
) SAL_THROW_EXTERN_C()
{
	void * obj = 0;

	if (cache == 0)
		return (0);

	if (cache->m_cpu_curr != 0)
	{
		RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));

		for (;;)
		{
			/* take object from magazine layer */
			rtl_cache_magazine_type *curr, *prev, *temp;

			curr = cache->m_cpu_curr;
			if ((curr != 0) && (curr->m_mag_used > 0))
			{
				obj = curr->m_objects[--curr->m_mag_used];
#if defined(HAVE_VALGRIND_MEMCHECK_H)
				VALGRIND_MEMPOOL_ALLOC(cache, obj, cache->m_type_size);
                if (cache->m_constructor != 0)
                {
                    /* keep constructed object defined */
                    VALGRIND_MAKE_MEM_DEFINED(obj, cache->m_type_size);
                }
#endif /* HAVE_VALGRIND_MEMCHECK_H */
				cache->m_cpu_stats.m_alloc += 1;
				RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));

				return (obj);
			}

			prev = cache->m_cpu_prev;
			if ((prev != 0) && (prev->m_mag_used > 0))
			{
				temp = cache->m_cpu_curr;
				cache->m_cpu_curr = cache->m_cpu_prev;
				cache->m_cpu_prev = temp;

				continue;
			}

			temp = rtl_cache_depot_exchange_alloc (cache, prev);
			if (temp != 0)
			{
				cache->m_cpu_prev = cache->m_cpu_curr;
				cache->m_cpu_curr = temp;

				continue;
			}

			/* no full magazine: fall through to slab layer */
			break;
		}

		RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
	}

	/* alloc buffer from slab layer */
	obj = rtl_cache_slab_alloc (cache);
	if ((obj != 0) && (cache->m_constructor != 0))
	{
	    /* construct object */
	    if (!((cache->m_constructor)(obj, cache->m_userarg)))
	    {
	        /* construction failure */
	        rtl_cache_slab_free (cache, obj), obj = 0;
	    }
	}
	return (obj);
}

/** rtl_cache_free()
 */
void
SAL_CALL rtl_cache_free (
    rtl_cache_type * cache,
    void *           obj
) SAL_THROW_EXTERN_C()
{
	if ((obj != 0) && (cache != 0))
	{
		RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));

		for (;;)
		{
			/* return object to magazine layer */
			rtl_cache_magazine_type *curr, *prev, *temp;

			curr = cache->m_cpu_curr;
			if ((curr != 0) && (curr->m_mag_used < curr->m_mag_size))
			{
				curr->m_objects[curr->m_mag_used++] = obj;
#if defined(HAVE_VALGRIND_MEMCHECK_H)
				VALGRIND_MEMPOOL_FREE(cache, obj);
#endif /* HAVE_VALGRIND_MEMCHECK_H */
				cache->m_cpu_stats.m_free += 1;
				RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));

				return;
			}

			prev = cache->m_cpu_prev;
			if ((prev != 0) && (prev->m_mag_used == 0))
			{
				temp = cache->m_cpu_curr;
				cache->m_cpu_curr = cache->m_cpu_prev;
				cache->m_cpu_prev = temp;

				continue;
			}

			temp = rtl_cache_depot_exchange_free (cache, prev);
			if (temp != 0)
			{
				cache->m_cpu_prev = cache->m_cpu_curr;
				cache->m_cpu_curr = temp;

				continue;
			}

			if (rtl_cache_depot_populate(cache) != 0)
			{
				continue;
			}

			/* no empty magazine: fall through to slab layer */
			break;
		}

		RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));

		/* no space for constructed object in magazine layer */
		if (cache->m_destructor != 0)
		{
			/* destruct object */
			(cache->m_destructor)(obj, cache->m_userarg);
		}

		/* return buffer to slab layer */
		rtl_cache_slab_free (cache, obj);
	}
}

/* ================================================================= *
 *
 * cache wsupdate (machdep) internals.
 *
 * ================================================================= */

/** rtl_cache_wsupdate_init()
 *
 *  @precond g_cache_list.m_lock initialized
 */
static void
rtl_cache_wsupdate_init (void);


/** rtl_cache_wsupdate_wait()
 *
 *  @precond g_cache_list.m_lock acquired
 */
static void
rtl_cache_wsupdate_wait (
	unsigned int seconds
);

/** rtl_cache_wsupdate_fini()
 *
 */
static void
rtl_cache_wsupdate_fini (void);

/* ================================================================= */

#if defined(SAL_UNX)

#include <sys/time.h>

static void *
rtl_cache_wsupdate_all (void * arg);

static void
rtl_cache_wsupdate_init (void)
{
	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	g_cache_list.m_update_done = 0;
	(void) pthread_cond_init (&(g_cache_list.m_update_cond), NULL);
	if (pthread_create (
			&(g_cache_list.m_update_thread), NULL, rtl_cache_wsupdate_all, (void*)(10)) != 0)
	{
		/* failure */
		g_cache_list.m_update_thread = (pthread_t)(0);
	}
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
}

static void
rtl_cache_wsupdate_wait (unsigned int seconds)
{
	if (seconds > 0)
	{
		struct timeval  now;
		struct timespec wakeup;

		gettimeofday(&now, 0);
		wakeup.tv_sec  = now.tv_sec + (seconds);
		wakeup.tv_nsec = now.tv_usec * 1000;

		(void) pthread_cond_timedwait (
			&(g_cache_list.m_update_cond),
			&(g_cache_list.m_lock),
			&wakeup);
	}
}

static void
rtl_cache_wsupdate_fini (void)
{
	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	g_cache_list.m_update_done = 1;
	pthread_cond_signal (&(g_cache_list.m_update_cond));
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));

	if (g_cache_list.m_update_thread != (pthread_t)(0))
		pthread_join (g_cache_list.m_update_thread, NULL);
}

/* ================================================================= */

#elif defined(SAL_OS2)

static void
rtl_cache_wsupdate_all (void * arg);

static void rtl_cache_fini (void);

static void
rtl_cache_wsupdate_init (void)
{
	ULONG ulThreadId;
	APIRET rc;

	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	g_cache_list.m_update_done = 0;

	// we use atexit() because this allows CRT exit to process handler before
	// threads are killed. Otherwise with __attribute__(destructor) this
	// function is called when DosExit starts processing DLL destruction
	// which happens after ALL threads have been killed...
	atexit( rtl_cache_fini);

	//g_cache_list.m_update_cond = CreateEvent (0, TRUE, FALSE, 0);
	/* Warp3 FP29 or Warp4 FP4 or better required */
	rc = DosCreateEventSem( NULL, &g_cache_list.m_update_cond, 0x0800, 0);

	g_cache_list.m_update_thread = (ULONG) _beginthread( rtl_cache_wsupdate_all, NULL,
			        65*1024, (void*) 10);
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
}

static void
rtl_cache_wsupdate_wait (unsigned int seconds)
{
	APIRET rc;
	if (seconds > 0)
	{
		RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
		rc = DosWaitEventSem(g_cache_list.m_update_cond, seconds*1000);
		RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	}
}

static void
rtl_cache_wsupdate_fini (void)
{
	APIRET rc;
	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	g_cache_list.m_update_done = 1;
	rc = DosPostEventSem(g_cache_list.m_update_cond);
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
	rc = DosWaitThread(&g_cache_list.m_update_thread, DCWW_WAIT);
}

/* ================================================================= */

#elif defined(SAL_W32)

static DWORD WINAPI
rtl_cache_wsupdate_all (void * arg);

static void
rtl_cache_wsupdate_init (void)
{
	DWORD dwThreadId;

	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	g_cache_list.m_update_done = 0;
	g_cache_list.m_update_cond = CreateEvent (0, TRUE, FALSE, 0);

	g_cache_list.m_update_thread =
		CreateThread (NULL, 0, rtl_cache_wsupdate_all, (LPVOID)(10), 0, &dwThreadId);
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
}

static void
rtl_cache_wsupdate_wait (unsigned int seconds)
{
	if (seconds > 0)
	{
		RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
		WaitForSingleObject (g_cache_list.m_update_cond, (DWORD)(seconds * 1000));
		RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	}
}

static void
rtl_cache_wsupdate_fini (void)
{
	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	g_cache_list.m_update_done = 1;
	SetEvent (g_cache_list.m_update_cond);
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));

	WaitForSingleObject (g_cache_list.m_update_thread, INFINITE);
}

#endif /* SAL_UNX || SAL_W32 */

/* ================================================================= */

/** rtl_cache_depot_wsupdate()
 *  update depot stats and purge excess magazines.
 *
 *  @precond cache->m_depot_lock acquired
 */
static void
rtl_cache_depot_wsupdate (
	rtl_cache_type *       cache,
	rtl_cache_depot_type * depot
)
{
	sal_Size npurge;

	depot->m_prev_min = depot->m_curr_min;
	depot->m_curr_min = depot->m_mag_count;

	npurge = SAL_MIN(depot->m_curr_min, depot->m_prev_min);
	for (; npurge > 0; npurge--)
	{
		rtl_cache_magazine_type * mag = rtl_cache_depot_dequeue (depot);
		if (mag != 0)
		{
			RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
			rtl_cache_magazine_clear (cache, mag);
			rtl_cache_free (cache->m_magazine_cache, mag);
			RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));
		}
	}
}

/** rtl_cache_wsupdate()
 *
 *  @precond cache->m_depot_lock released
 */
static void
rtl_cache_wsupdate (
	rtl_cache_type * cache
)
{
	if (cache->m_magazine_cache != 0)
	{
		RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));

		OSL_TRACE(
			"rtl_cache_wsupdate(\"%s\") "
			"[depot: count, curr_min, prev_min] "
			"full: %lu, %lu, %lu; empty: %lu, %lu, %lu",
			cache->m_name,
			cache->m_depot_full.m_mag_count,
			cache->m_depot_full.m_curr_min,
			cache->m_depot_full.m_prev_min,
			cache->m_depot_empty.m_mag_count,
			cache->m_depot_empty.m_curr_min,
			cache->m_depot_empty.m_prev_min
		);

		rtl_cache_depot_wsupdate (cache, &(cache->m_depot_full));
		rtl_cache_depot_wsupdate (cache, &(cache->m_depot_empty));

		RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
	}
}

/** rtl_cache_wsupdate_all()
 *
 */
#if defined(SAL_UNX)
static void *
#elif defined(SAL_OS2)
static void
#elif defined(SAL_W32)
static DWORD WINAPI
#endif /* SAL_UNX || SAL_W32 */
rtl_cache_wsupdate_all (void * arg)
{
	unsigned int seconds = (unsigned int)SAL_INT_CAST(sal_uIntPtr, arg);

	RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
	while (!g_cache_list.m_update_done)
	{
		rtl_cache_wsupdate_wait (seconds);
		if (!g_cache_list.m_update_done)
		{
			rtl_cache_type * head, * cache;

			head = &(g_cache_list.m_cache_head);
			for (cache  = head->m_cache_next;
				 cache != head;
				 cache  = cache->m_cache_next)
			{
				rtl_cache_wsupdate (cache);
			}
		}
	}
	RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));

#if !defined(SAL_OS2)
	return (0);
#endif
}

/* ================================================================= *
 *
 * cache initialization.
 *
 * ================================================================= */

static void
rtl_cache_once_init (void)
{
	{
		/* list of caches */
		RTL_MEMORY_LOCK_INIT(&(g_cache_list.m_lock));
		(void) rtl_cache_constructor (&(g_cache_list.m_cache_head));
	}
	{
		/* cache: internal arena */
		OSL_ASSERT(gp_cache_arena == 0);

		gp_cache_arena = rtl_arena_create (
			"rtl_cache_internal_arena",
			64,   /* quantum */
			0,    /* no quantum caching */
			NULL, /* default source */
			rtl_arena_alloc,
			rtl_arena_free,
			0     /* flags */
		);
		OSL_ASSERT(gp_cache_arena != 0);

		/* check 'gp_default_arena' initialization */
		OSL_ASSERT(gp_default_arena != 0);
	}
	{
		/* cache: magazine cache */
		static rtl_cache_type g_cache_magazine_cache;

		OSL_ASSERT(gp_cache_magazine_cache == 0);
		VALGRIND_CREATE_MEMPOOL(&g_cache_magazine_cache, 0, 0);
		(void) rtl_cache_constructor (&g_cache_magazine_cache);

		gp_cache_magazine_cache = rtl_cache_activate (
			&g_cache_magazine_cache,
			"rtl_cache_magazine_cache",
			sizeof(rtl_cache_magazine_type), /* objsize  */
			0,                               /* objalign */
			rtl_cache_magazine_constructor,
			rtl_cache_magazine_destructor,
			0, /* reclaim */
			0, /* userarg: NYI */
			gp_default_arena, /* source */
			RTL_CACHE_FLAG_NOMAGAZINE /* during bootstrap; activated below */
		);
		OSL_ASSERT(gp_cache_magazine_cache != 0);

		/* activate magazine layer */
		g_cache_magazine_cache.m_magazine_cache = gp_cache_magazine_cache;
	}
	{
		/* cache: slab (struct) cache */
		static rtl_cache_type g_cache_slab_cache;

		OSL_ASSERT(gp_cache_slab_cache == 0);
		VALGRIND_CREATE_MEMPOOL(&g_cache_slab_cache, 0, 0);
		(void) rtl_cache_constructor (&g_cache_slab_cache);

		gp_cache_slab_cache = rtl_cache_activate (
			&g_cache_slab_cache,
			"rtl_cache_slab_cache",
			sizeof(rtl_cache_slab_type), /* objsize  */
			0,                           /* objalign */
			rtl_cache_slab_constructor,
			rtl_cache_slab_destructor,
			0,                           /* reclaim */
			0,                           /* userarg: none */
			gp_default_arena,            /* source */
			0                            /* flags: none */
		);
		OSL_ASSERT(gp_cache_slab_cache != 0);
	}
	{
		/* cache: bufctl cache */
		static rtl_cache_type g_cache_bufctl_cache;

		OSL_ASSERT(gp_cache_bufctl_cache == 0);
		VALGRIND_CREATE_MEMPOOL(&g_cache_bufctl_cache, 0, 0);
		(void) rtl_cache_constructor (&g_cache_bufctl_cache);

		gp_cache_bufctl_cache = rtl_cache_activate (
			&g_cache_bufctl_cache,
			"rtl_cache_bufctl_cache",
			sizeof(rtl_cache_bufctl_type), /* objsize */
			0,                             /* objalign  */
			0,                /* constructor */
			0,                /* destructor */
			0,                /* reclaim */
			0,                /* userarg */
			gp_default_arena, /* source */
			0                 /* flags: none */
		);
		OSL_ASSERT(gp_cache_bufctl_cache != 0);
	}

	rtl_cache_wsupdate_init();
}

static int
rtl_cache_init (void)
{
	static sal_once_type g_once = SAL_ONCE_INIT;
	SAL_ONCE(&g_once, rtl_cache_once_init);
	return (gp_cache_arena != 0);
}

/* ================================================================= */

/*
  Issue http://udk.openoffice.org/issues/show_bug.cgi?id=92388

  Mac OS X does not seem to support "__cxa__atexit", thus leading
  to the situation that "__attribute__((destructor))__" functions
  (in particular "rtl_{memory|cache|arena}_fini") become called
  _before_ global C++ object d'tors.

  Delegated the call to "rtl_cache_fini()" into a dummy C++ object,
  see alloc_fini.cxx .
*/
#if defined(__GNUC__) && !defined(MACOSX) && !defined(SAL_OS2)
static void rtl_cache_fini (void) __attribute__((destructor));
#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#pragma fini(rtl_cache_fini)
static void rtl_cache_fini (void);
#endif /* __GNUC__ || __SUNPRO_C */

void
rtl_cache_fini (void)
{
	if (gp_cache_arena != 0)
	{
		rtl_cache_type * cache, * head;

		rtl_cache_wsupdate_fini();

		if (gp_cache_bufctl_cache != 0)
		{
			cache = gp_cache_bufctl_cache, gp_cache_bufctl_cache = 0;
			rtl_cache_deactivate (cache);
			rtl_cache_destructor (cache);
			VALGRIND_DESTROY_MEMPOOL(cache);
		}
		if (gp_cache_slab_cache != 0)
		{
			cache = gp_cache_slab_cache, gp_cache_slab_cache = 0;
			rtl_cache_deactivate (cache);
			rtl_cache_destructor (cache);
			VALGRIND_DESTROY_MEMPOOL(cache);
		}
		if (gp_cache_magazine_cache != 0)
		{
			cache = gp_cache_magazine_cache, gp_cache_magazine_cache = 0;
			rtl_cache_deactivate (cache);
			rtl_cache_destructor (cache);
			VALGRIND_DESTROY_MEMPOOL(cache);
		}
		if (gp_cache_arena != 0)
		{
			rtl_arena_destroy (gp_cache_arena);
			gp_cache_arena = 0;
		}

		RTL_MEMORY_LOCK_ACQUIRE(&(g_cache_list.m_lock));
		head = &(g_cache_list.m_cache_head);
		for (cache = head->m_cache_next; cache != head; cache = cache->m_cache_next)
		{
			OSL_TRACE(
				"rtl_cache_fini(\"%s\") "
				"[slab]: allocs: %"PRIu64", frees: %"PRIu64"; total: %lu, used: %lu; "
				"[cpu]: allocs: %"PRIu64", frees: %"PRIu64"; "
				"[total]: allocs: %"PRIu64", frees: %"PRIu64"",
				cache->m_name,
				cache->m_slab_stats.m_alloc, cache->m_slab_stats.m_free,
				cache->m_slab_stats.m_mem_total, cache->m_slab_stats.m_mem_alloc,
				cache->m_cpu_stats.m_alloc, cache->m_cpu_stats.m_free,
				cache->m_slab_stats.m_alloc + cache->m_cpu_stats.m_alloc,
				cache->m_slab_stats.m_free + cache->m_cpu_stats.m_free
			);
		}
		RTL_MEMORY_LOCK_RELEASE(&(g_cache_list.m_lock));
	}
}

/* ================================================================= */