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psyclpc/src/mempools.c

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/*---------------------------------------------------------------------------
* Specialised Memory Allocators.
*
*---------------------------------------------------------------------------
* Memory buffers provide memory for functions which repeatedly allocate
* large chunks of temporary memory (restore_object() for example). Instead
* of deallocating the memory after its use, the memory buffer keeps it
* around for the next time. This way any interim fragmentation of the free
* large memory pool won't affect the next use.
*
* The driver implements a buffer each for dedicated purposes. Each of
* these buffers is identified by a number from membuffer_e.
*---------------------------------------------------------------------------
* Purpose of memory pools is to provide fast allocation methods for
* certain allocation patterns. They are most useful for scratchpad
* purposes where a largish number of small allocations need to be
* deallocated at once.
*
* Mempools: allocation of objects with identical time of death.
* Attempts to deallocate single objects have no effect.
*
* Lifopools: allocation/deallocation of objects follows (more than less)
* a lifo pattern.
*
* TODO: A small-block pool, to manage lots of small blocks of equal size
* TODO:: without the overhead of smalloc. Initialized with the block size,
* TODO:: the number of initial blocks, and the number of blocks each
* TODO:: the pool has to grow. These blocks can be freed and are then
* TODO:: kept in a freelist for later reuse. To help compacting the pool
* TODO:: a method alloc_before(void *) would allocate a free small block
* TODO:: before the given one - if there is no such free block, the
* TODO:: method would return NULL. With this method a user of the
* TODO:: can compact its data at the front of the pool blocks.
* TODO:: The last unused pool block is freed only if either another small
* TODO:: block is freed, or the method flush_free_pool_blocks() (or so)
* TODO:: is called.
*
* Memory pools can be made dependant from other pools. This means that
* whenever the 'superior' pool is reset or deleted, all pools depending
* on this superior one are also reset or deleted. This is a
* 1:n relationship: one pool can have several pools depending on it, but
* itself can be depending on only one superior pool.
*
* The implementation uses one 'mempool' structure to hold the organisational
* data of the mempool, and several 'memblock' structures providing the
* actual memory. Memory pool users only get the pointer to their pool (the
* internals of the mempool structure are private) and have to use it
* as a handle in all function calls. The memblock structures are used
* internally only.
*
* Every memory pool is created with an 'allocation size' as parameter.
* This size determines how much memory is available in every memblock.
* Since Mempools uses an immediate-fit strategy when allocating memory from
* a pool, it is the responsibility of the caller to chose an block allocation
* size substantially larger than a typical allocation from the pool.
* It is possible to allocate memory larger than the allocation size from
* the pool, in which case the the mempool behaves like a malloc() with
* (semi)automatic free().
*
* The size_xxxpool() utility functions calculate a somewhat optimum
* pool allocation size based on the element size. The function tries to
* keep the allocation size under a certain limit in order to avoid running
* into large block fragmentation (because if that happens, we would be
* better off not using a memory pool at all).
*
* The memory allocated from a mempool is aligned to the size of union align
* (which is assumed to be a power of 2).
*---------------------------------------------------------------------------
*/
#include "driver.h"
#include <assert.h>
#include <stddef.h>
#include <stdlib.h>
#include <sys/types.h>
#include "mempools.h"
#include "gcollect.h"
#ifdef DEBUG
#include "simulate.h"
#endif
#include "strfuns.h"
#include "svalue.h"
#include "xalloc.h"
#include "../mudlib/sys/debug_info.h"
/*=========================================================================*/
/* M E M B U F F E R S */
/*-------------------------------------------------------------------------*/
/* -- struct membuffer_s: one memory buffer -- */
typedef struct membuffer_s {
void * mem; /* The allocated memory */
size_t size; /* Size of the allocated memory */
} membuffer_t;
static membuffer_t membuffers[mbMax];
/* The memory buffers.
*/
/*-------------------------------------------------------------------------*/
void
mb_init (void)
/* Initialize the memory buffers.
*/
{
int i;
for (i = 0; i < mbMax; i++)
{
membuffers[i].mem = NULL;
membuffers[i].size = 0;
}
} /* mb_init() */
/*-------------------------------------------------------------------------*/
void
mb_release (void)
/* Free all memory buffers.
*/
{
int i;
for (i = 0; i < mbMax; i++)
{
if (membuffers[i].mem != NULL)
xfree(membuffers[i].mem);
membuffers[i].mem = NULL;
membuffers[i].size = 0;
}
} /* mb_release() */
/*-------------------------------------------------------------------------*/
void *
mb_alloc (membuffer_e buf, size_t size)
/* Allocate 'size' bytes of memory for buffer <buf>.
* Returns NULL when out of memory.
*/
{
#ifdef DEBUG
if (buf < 0 || buf >= mbMax)
fatal("mb_alloc: Illegal buf# %d\n", buf);
#endif
if (membuffers[buf].size >= size)
return membuffers[buf].mem;
if (membuffers[buf].mem != NULL)
xfree(membuffers[buf].mem);
membuffers[buf].mem = xalloc(size);
if (membuffers[buf].mem != NULL)
membuffers[buf].size = size;
else
membuffers[buf].size = 0;
return membuffers[buf].mem;
} /* mb_alloc() */
/*-------------------------------------------------------------------------*/
void *
mb_realloc (membuffer_e buf, size_t size)
/* Realloate the memory of buffer <buf> to hold <size> bytes, without
* losing the current content, and return the new pointer.
* Returns NULL when out of memory (the old memory block will be unaffected
* then).
*/
{
void * mem;
#ifdef DEBUG
if (buf < 0 || buf >= mbMax)
fatal("mb_alloc: Illegal buf# %d\n", buf);
#endif
if (membuffers[buf].size >= size)
return membuffers[buf].mem;
if (membuffers[buf].mem != NULL)
mem = rexalloc(membuffers[buf].mem, size);
else
mem = xalloc(size);
if (mem != NULL)
{
membuffers[buf].mem = mem;
membuffers[buf].size = size;
}
return mem;
} /* mb_realloc() */
/*-------------------------------------------------------------------------*/
#ifdef GC_SUPPORT
void
mb_clear_refs (void)
/* GC Support: Clear the refs of all memory associated with the
* memory buffers.
*/
{
int i;
for (i = 0; i < mbMax; i++)
{
if (membuffers[i].mem != NULL)
clear_memory_reference(membuffers[i].mem);
}
} /* mb_clear_refs() */
void
mb_note_refs (void)
/* GC Support: Note the refs of all memory associated with the
* memory buffers.
*/
{
int i;
for (i = 0; i < mbMax; i++)
{
if (membuffers[i].mem != NULL)
note_malloced_block_ref(membuffers[i].mem);
}
} /* mb_note_refs() */
#endif /* GC_SUPPORT */
/*-------------------------------------------------------------------------*/
size_t
mb_status (strbuf_t * sbuf, Bool verbose)
/* Gather (and optionally print) the statistics from the membuffers.
* Return the amount of memory used.
*/
{
size_t res;
int i;
for (i = 0, res = 0; i < mbMax; i++)
res += membuffers[i].size;
#if defined(__MWERKS__) && !defined(WARN_ALL)
# pragma warn_largeargs off
#endif
/* In verbose mode, print the statistics */
if (verbose)
{
strbuf_add(sbuf, "\nMemory Buffers:\n");
strbuf_add(sbuf, "---------------\n");
strbuf_addf(sbuf, "File data: %8zu\n", membuffers[mbFile].size);
strbuf_addf(sbuf, "Swap buffer: %8zu\n", membuffers[mbSwap].size);
}
else
{
strbuf_addf(sbuf, "Memory buffers:\t\t\t\t %9zu\n", res);
}
return res;
#if defined(__MWERKS__)
# pragma warn_largeargs reset
#endif
} /* mb_status() */
/*-------------------------------------------------------------------------*/
void
mb_dinfo_status (svalue_t *svp, int value)
/* Return the rxcache information for debug_info(DINFO_DATA, DID_STATUS).
* <svp> points to the svalue block for the result, this function fills in
* the spots for the object table.
* If <value> is -1, <svp> points indeed to a value block; other it is
* the index of the desired value and <svp> points to a single svalue.
*/
{
#define ST_NUMBER(which,code) \
if (value == -1) svp[which].u.number = code; \
else if (value == which) svp->u.number = code
ST_NUMBER(DID_ST_MB_FILE, membuffers[mbFile].size);
ST_NUMBER(DID_ST_MB_SWAP, membuffers[mbSwap].size);
#undef ST_NUMBER
} /* mb_dinfo_status() */
/*=========================================================================*/
/* M E M P O O L S */
/*-------------------------------------------------------------------------*/
/* --- union align: aligment structure---
* Combines several basic basic types in order to determined
* the basic alignment size. This size must be a power of 2, assert()s will
* check for that.
*/
union align {
int i;
long l;
double d;
void *p;
};
typedef union align align_t;
/* Round the value x up to the next integral of sizeof(union align)
*/
#define ROUND(x) (((x)+sizeof(align_t)-1) & ~(sizeof(align_t)-1))
/* --- struct memblock_s: manages one block of memory ---
* Used for the low-level allocation of memory, the various allocators
* then work within the allocated arena.
*
* Mempools fill the arena from the end. pMark marks the break between
* the (low) unused and (high) used memory, pointing to the first used
* byte.
*
* Lifopools are like Mempools, with the addition that every used
* block is prepended by a lifo_t structure (allocated to a multiple
* of the align_t type). pMark points therefore at this structure of the
* first used block. If a lifo-allocation is freed, it is just marked
* as free (negative length) unless it is the block pMark points to.
* In that case, pMark is moved up until it points to a used block,
* retrieving previously freed blocks as well. When a memblock is
* totally free, the pool will put it into a freelist for later re-use.
*
* The union construct makes sure that data[] is aligned properly.
*/
typedef struct memblock_s * Memblock;
struct memblock_s {
Memblock pNext; /* Next memblock in list */
char *pMark; /* End of unused arena */
size_t length; /* Total size of this memblock */
union {
align_t a;
char data[1]; /* Placeholder for data arena */
} u;
};
#define MEMBLOCK_LIMIT (128)
/* Maximum size for the userspace of a memory block.
* Using blocks larger than this is likely to run into fragmentation
* of the large block heap.
*/
/* --- struct lifo_s: headblock for a lifo-type allocation ---
*
* One of these structures, allocated to a multiple of align_t, is
* prepended to every lifopool allocation. Additionally, the end
* of every memory block is marked with a 'used' structure as sentinel.
*/
typedef struct lifo_s lifo_t;
struct lifo_s {
ssize_t length; /* Size of this block, including this structure.
* Positive for allocated blocks, negative for free ones.
*/
Memblock pBlock; /* Backpointer to the memoryblock holding this block */
};
#define SIZEOF_LIFO_T ROUND(sizeof(lifo_t))
/*=========================================================================*/
/*-------------------------------------------------------------------------*/
/* Memory pool types
*/
enum pooltype_u {
MEMPOOL = 0,
LIFOPOOL
};
typedef enum pooltype_u pooltype_t;
/*-------------------------------------------------------------------------*/
/* struct mempool_s: the organisational structure of every memory pool.
*/
struct mempool_s {
pooltype_t type; /* The type of this pool */
size_t iAllocSize; /* Typical alloc size of a memory block */
Memblock pBlocks; /* List of memory blocks
* It is guaranteed that at least one memory block
* exists. */
Memblock pFree; /* Lifopools: List of unused memory blocks */
Mempool pSuper; /* The pool this one depends on */
Mempool pSubPools; /* List of depending pools */
Mempool pNextSub; /* Next pool in the dependee list */
};
/*-------------------------------------------------------------------------*/
static INLINE size_t
size_pool (size_t elemsize, size_t o_size)
/* Return the userspace size for a memblock suitable to hold objects of
* size <elemsize>, taking into account an per-element overhead of <o_size>
* and the maximum memblock size.
* The result can be passed as 'size' parameter to new_pool() functions.
*/
{
size_t esize = (ROUND(elemsize) + o_size);
unsigned int num;
num = MEMBLOCK_LIMIT / esize;
if (num < 1)
num = 1;
return num * esize;
} /* size_pool() */
/*-------------------------------------------------------------------------*/
size_t
size_mempool (size_t elemsize)
/* Return the userspace size for a mempool suitable to hold objects of
* size <elemsize>, taking into account an per-element overhead of <o_size>
* and the maximum memblock size.
* The result can be passed as 'size' parameter to new_mempool().
*/
{
return size_pool(elemsize, 0);
} /* size_mempool() */
/*-------------------------------------------------------------------------*/
size_t
size_lifopool (size_t elemsize)
/* Return the userspace size for a lifopool suitable to hold objects of
* size <elemsize>, taking into account an per-element overhead of <o_size>
* and the maximum memblock size.
* The result can be passed as 'size' parameter to new_lifopool().
*/
{
return size_pool(elemsize, SIZEOF_LIFO_T);
} /* size_lifopool() */
/*-------------------------------------------------------------------------*/
static INLINE Mempool
new_pool (size_t iSize, pooltype_t type)
/* Create a new memory pool of <type> for a typical allocation size of <iSize>
* bytes per memory block and prepare
* Result is the pointer to the mempool structure, or NULL if an error
* occurs.
*/
{
Mempool pPool;
struct memblock_s * pBlock;
assert(iSize > 0);
assert(sizeof(union align) == (sizeof(union align) & ~(sizeof(union align)-1)));
/* If this assert fails, sizeof(union align) is not a power of 2 */
/* Round iSize up to the next integral of sizeof(union align) */
iSize = ROUND(iSize);
pPool = xalloc(sizeof(*pPool));
if (!pPool)
return NULL;
/* There must be at least one memblock in the list! */
pBlock = xalloc(sizeof(*pBlock) - sizeof(pBlock->u) + iSize);
if (!pBlock)
{
xfree(pPool);
return NULL;
}
pBlock->pNext = NULL;
pBlock->length = sizeof(*pBlock) - sizeof(pBlock->u) + iSize;
pBlock->pMark = pBlock->u.data + iSize;
/* Setup the pool */
pPool->type = type;
pPool->iAllocSize = iSize;
pPool->pBlocks = pBlock;
pPool->pFree = NULL;
pPool->pSuper = NULL;
pPool->pSubPools = NULL;
return pPool;
} /* new_pool() */
/*-------------------------------------------------------------------------*/
Mempool
new_mempool (size_t iSize)
/* Create a new Mempool for a typical allocation size of <iSize>
* bytes per memory block and prepare
* Result is the pointer to the mempool structure, or NULL if an error
* occurs.
*/
{
return new_pool(iSize, MEMPOOL);
} /* new_mempool() */
/*-------------------------------------------------------------------------*/
Mempool
new_lifopool (size_t iSize)
/* Create a new Lifopool for a typical allocation size of <iSize>
* bytes per memory block and prepare
* Result is the pointer to the mempool structure, or NULL if an error
* occurs.
*/
{
Mempool pPool;
iSize += SIZEOF_LIFO_T; /* Include space for the sentinel block */
pPool = new_pool(iSize, LIFOPOOL);
if (pPool)
{
/* Add a sentinel (pseudo-used block) at the end of the arena.
*/
struct memblock_s * pBlock = pPool->pBlocks;
lifo_t *p = (lifo_t *)(pBlock->pMark - SIZEOF_LIFO_T);
p->length = 1;
p->pBlock = pBlock;
/* Update the pMark pointer */
pBlock->pMark = (char *)p;
}
return pPool;
} /* new_lifopool() */
/*-------------------------------------------------------------------------*/
void
mempool_depend_on (Mempool pSub, Mempool pSuper)
/* Memory pool pSub is made a dependee of pool pSuper.
* If pSub is a dependee of some pool already or if the pooltypes differ,
* an assertion is raised.
*/
{
assert(pSub->pSuper == NULL);
assert(pSub->type == pSuper->type);
pSub->pSuper = pSuper;
pSub->pNextSub = pSuper->pSubPools;
pSuper->pSubPools = pSub;
} /* mempool_depend_on() */
/*-------------------------------------------------------------------------*/
static INLINE void *
alloc_from_pool (Mempool pPool, size_t iSize)
/* Allocate <iSize> bytes of memory from the mempool <pPool>.
* Return a pointer to the allocated memory (it is at least aligned to
* the size of a ALIGNTYPE), or NULL on failure.
*
* Within the memblocks, the memory is allocated from the end of
* the allocated memory.
*/
{
Memblock pBlock;
/* Round iSize up to the next integral of sizeof(ALIGNTYPE) */
iSize = ROUND(iSize);
/* If it is a big block, allocate it directly and insert
* it directly _after_ the current 'normal sized' memblock.
*/
if (iSize >= pPool->iAllocSize)
{
assert(pPool->pBlocks != NULL); /* just in case */
pBlock = xalloc(sizeof(*pBlock)-sizeof(pBlock->u)+iSize);
if (pBlock == NULL)
return NULL;
pBlock->length = sizeof(*pBlock)-sizeof(pBlock->u)+iSize;
pBlock->pMark = pBlock->u.data;
pBlock->pNext = pPool->pBlocks->pNext;
pPool->pBlocks->pNext = pBlock;
return (void *)(pBlock->u.data);
}
/* Normal iSizes are always allocated from the first memblock
* in the pBlock list. If the current memblock has not enough
* memory left, a new one is allocated.
*/
pBlock = pPool->pBlocks;
if ((ptrdiff_t)iSize > pBlock->pMark - pBlock->u.data)
{
pBlock = xalloc( sizeof(*pBlock)-sizeof(pBlock->u)
+ pPool->iAllocSize);
if (pBlock == NULL)
return NULL;
pBlock->length = sizeof(*pBlock)-sizeof(pBlock->u)
+ pPool->iAllocSize;
pBlock->pMark = pBlock->u.data + pPool->iAllocSize;
pBlock->pNext = pPool->pBlocks;
pPool->pBlocks = pBlock;
}
/* pBlock now points to a memblock with enough memory left.
* Allocate the desired chunk from the end of the .data[] array.
*/
pBlock->pMark -= iSize;
return (void *)(pBlock->pMark);
} /* alloc_from_pool() */
/*-------------------------------------------------------------------------*/
static INLINE void *
alloc_from_lifo (Mempool pPool, size_t iSize)
/* Allocate <iSize> bytes of memory from the lifopool <pPool>.
* Return a pointer to the allocated memory (it is at least aligned to
* the size of a ALIGNTYPE), or NULL on failure.
*
* Within the memblocks, the memory is allocated from the end of
* the allocated memory.
*/
{
Memblock pBlock;
lifo_t *pLifo;
/* Round iSize up to the next integral of sizeof(ALIGNTYPE) */
iSize = ROUND(iSize + SIZEOF_LIFO_T);
/* If it is a big block, allocate it directly and insert
* it directly _after_ the current 'normal sized' memblock.
*/
if (iSize >= pPool->iAllocSize)
{
assert(pPool->pBlocks != NULL); /* just in case */
pBlock = xalloc(sizeof(*pBlock)-sizeof(pBlock->u)
+iSize+SIZEOF_LIFO_T);
if (pBlock == NULL)
return NULL;
pBlock->length = sizeof(*pBlock)-sizeof(pBlock->u)
+iSize+SIZEOF_LIFO_T;
pBlock->pMark = pBlock->u.data;
pBlock->pNext = pPool->pBlocks->pNext;
pPool->pBlocks->pNext = pBlock;
/* Write the lifo_t for the allocated block */
pLifo = (lifo_t *)pBlock->pMark;
pLifo->length = (ssize_t)iSize;
pLifo->pBlock = pBlock;
/* Write the sentinel */
pLifo = (lifo_t *)(pBlock->pMark+iSize);
pLifo->length = 1;
pLifo->pBlock = pBlock;
/* Return the address */
return (void *)(pBlock->u.data+SIZEOF_LIFO_T);
}
/* Normal iSizes are always allocated from the first memblock
* in the pBlock list. If the current memblock has not enough
* memory left, a new one is allocated.
*/
pBlock = pPool->pBlocks;
if ((ptrdiff_t)iSize > pBlock->pMark - pBlock->u.data)
{
/* If there are blocks in the freelist, use those first;
* otherwise allocate a new one.
*/
if (pPool->pFree)
{
pBlock = pPool->pFree;
pPool->pFree = pBlock->pNext;
}
else
{
pBlock = xalloc( sizeof(*pBlock)-sizeof(pBlock->u)
+ pPool->iAllocSize);
if (pBlock == NULL)
return NULL;
pBlock->length = sizeof(*pBlock)-sizeof(pBlock->u)
+ pPool->iAllocSize;
pBlock->pMark = pBlock->u.data + pPool->iAllocSize;
/* For lifopools, add a sentinel (pseudo-used block) at the end
* of the arena.
*/
pLifo = (lifo_t *)(pBlock->pMark-SIZEOF_LIFO_T);
pLifo->length = 1;
pLifo->pBlock = pBlock;
/* Update the pMark pointer */
pBlock->pMark = (char *)pLifo;
}
/* Link the block into the list of used blocks */
pBlock->pNext = pPool->pBlocks;
pPool->pBlocks = pBlock;
}
/* pBlock now points to a memblock with enough memory left.
* Allocate the desired chunk from the end of the .data[] array.
*/
pBlock->pMark -= iSize;
/* Put in the lifo_t structure and
* return the address after the structure.
*/
pLifo = (lifo_t *)pBlock->pMark;
pLifo->length = (ssize_t)iSize;
pLifo->pBlock = pBlock;
return (void *)(pBlock->pMark + SIZEOF_LIFO_T);
} /* alloc_from_lifo() */
/*-------------------------------------------------------------------------*/
void *
mempool_alloc (Mempool pPool, size_t iSize)
/* Allocate <iSize> bytes of memory from the pool <pPool>.
* Return a pointer to the allocated memory (it is at least aligned to
* the size of a ALIGNTYPE), or NULL on failure.
*
* Within the memblocks, the memory is allocated from the end of
* the allocated memory.
*/
{
assert(pPool != NULL);
assert(iSize < LONG_MAX);
if (pPool->type == LIFOPOOL)
return alloc_from_lifo(pPool, iSize);
return alloc_from_pool(pPool, iSize);
} /* mempool_alloc() */
/*-------------------------------------------------------------------------*/
void
mempool_free (Mempool pPool, void * adr)
/* Return the block allocated at <adr> to the pool <pPool>.
* This is a noop for mempools, but (lazily) returns memory to a lifopool.
*/
{
Memblock pBlock;
lifo_t * pLifo;
ssize_t length;
assert(pPool != NULL);
assert(adr != NULL);
if (LIFOPOOL != pPool->type)
return;
/* Get the lifo_t structure and its data */
pLifo = (lifo_t *)((char *)adr - SIZEOF_LIFO_T);
assert(pLifo->length > 1);
pBlock = pLifo->pBlock;
length = pLifo->length;
/* Mark the block as unused */
pLifo->length = -length;
/* If this newly freed block happens to be the first free block in the
* memblock, return it and all following free blocks to the free
* arena of the memblock.
*/
if ((char *)pLifo == pBlock->pMark)
{
/* Loop invariant: pMark == pLifo */
while (pLifo->length < 0)
{
pBlock->pMark = pBlock->pMark - pLifo->length;
pLifo = (lifo_t *)pBlock->pMark;
}
}
/* If the leading memblock(s) of the pool are completely free,
* move them over into the free list.
*/
if (pBlock == pPool->pBlocks)
{
while (pBlock->pNext != NULL
&& pBlock->pMark - (char*)&(pBlock->u)
>= (ptrdiff_t)(pPool->iAllocSize - SIZEOF_LIFO_T))
{
pPool->pBlocks = pBlock->pNext;
pBlock->pNext = pPool->pFree;
pPool->pFree = pBlock;
pBlock = pPool->pBlocks;
}
}
/* That's it */
} /* mempool_free() */
/*-------------------------------------------------------------------------*/
void
mempool_reset (Mempool pPool)
/* Free all memory allocated from the pool <pPool>, but leave the pool
* around for further usage. If the pool has dependees, they are reset
* recursively.
*/
{
Memblock pBlock;
assert(pPool != NULL);
assert(pPool->pBlocks != NULL); /* just in case */
/* Deallocate all memblocks but the first one */
pBlock = pPool->pBlocks->pNext;
while (pBlock != NULL)
{
Memblock pThis = pBlock;
pBlock = pBlock->pNext;
xfree(pThis);
}
pBlock = pPool->pFree;
while (pBlock != NULL)
{
Memblock pThis = pBlock;
pBlock = pBlock->pNext;
xfree(pThis);
}
pPool->pFree = NULL;
/* Reinitialise the first (and now only) memblock */
pBlock = pPool->pBlocks;
pBlock->pMark = pBlock->u.data + pPool->iAllocSize
- (LIFOPOOL == pPool->type ? SIZEOF_LIFO_T : 0);
pBlock->pNext = NULL;
/* Reset all depending pools */
for (pPool = pPool->pSubPools; pPool != NULL; pPool = pPool->pNextSub)
{
mempool_reset(pPool);
}
} /* mempool_reset() */
/*-------------------------------------------------------------------------*/
void
mempool_delete (Mempool pPool)
/* Delete the pool <pPool>, all memory allocated from it, and all
* depending pools. <pPool> is invalid after the function returns.
*/
{
Memblock pBlock;
Mempool pSubPool;
assert(pPool != NULL);
/* Free all memblocks */
pBlock = pPool->pBlocks;
while (pBlock != NULL)
{
Memblock pThis = pBlock;
pBlock = pBlock->pNext;
xfree(pThis);
}
pBlock = pPool->pFree;
while (pBlock != NULL)
{
Memblock pThis = pBlock;
pBlock = pBlock->pNext;
xfree(pThis);
}
/* If this pool is a dependee, delete it from the list */
if (pPool->pSuper != NULL)
{
Mempool pPrev, pNext;
pPrev = pPool->pSuper;
pNext = pPrev->pSubPools;
if (pPrev->pSubPools == pPool)
{
pPrev->pSubPools = pPool->pNextSub;
}
else
{
for (; pNext != NULL && pNext != pPool
; pPrev = pNext, pNext = pNext->pNextSub
) /* SKIP */;
if (pNext == pPool)
pPrev->pNextSub = pPool->pNextSub;
}
}
/* Delete all depending pools, but take care that those
* pools don't start to scan our subpool list.
*/
for (pSubPool = pPool->pSubPools; pSubPool != NULL; )
{
Mempool pThis = pSubPool;
pSubPool = pSubPool->pNextSub;
pThis->pSuper = NULL; /* ! */
mempool_delete(pThis);
}
/* Finally, deallocate this pool */
xfree(pPool);
} /* mempool_delete() */
/*-------------------------------------------------------------------------*/
size_t
mempool_size (Mempool pPool)
/* Return the total size of the mempool <pPool>.
*/
{
Memblock pBlock;
size_t size;
size = sizeof(*pPool);
for (pBlock = pPool->pBlocks; pBlock; pBlock = pBlock->pNext)
size += pBlock->length;
for (pBlock = pPool->pFree; pBlock; pBlock = pBlock->pNext)
size += pBlock->length;
return size;
} /* mempool_size() */
/*-------------------------------------------------------------------------*/
#ifdef GC_SUPPORT
void
mempool_clear_refs (Mempool pPool)
/* GC Support: Clear the refs of all memory associated with <pPool> and
* its dependees.
*/
{
Memblock pBlock;
clear_memory_reference(pPool);
for (pBlock = pPool->pBlocks; pBlock; pBlock = pBlock->pNext)
clear_memory_reference(pBlock);
for (pBlock = pPool->pFree; pBlock; pBlock = pBlock->pNext)
clear_memory_reference(pBlock);
for (pPool = pPool->pSubPools; pPool != NULL; pPool = pPool->pNextSub)
mempool_clear_refs(pPool);
} /* mempool_clear_refs() */
void
mempool_note_refs (Mempool pPool)
/* GC Support: Note the refs of all memory associated with <pPool> and
* its dependees.
*/
{
Memblock pBlock;
note_malloced_block_ref(pPool);
for (pBlock = pPool->pBlocks; pBlock; pBlock = pBlock->pNext)
note_malloced_block_ref(pBlock);
for (pBlock = pPool->pFree; pBlock; pBlock = pBlock->pNext)
note_malloced_block_ref(pBlock);
for (pPool = pPool->pSubPools; pPool != NULL; pPool = pPool->pNextSub)
mempool_note_refs(pPool);
} /* mempool_note_refs() */
#endif /* GC_SUPPORT */
/*-------------------------------------------------------------------------*/
/*=========================================================================*/
/***************************************************************************/
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