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author | dkf <dkf@noemail.net> | 2004-06-21 08:54:33 (GMT) |
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committer | dkf <dkf@noemail.net> | 2004-06-21 08:54:33 (GMT) |
commit | e0c40c81b46bedc9c11d37026800b7fe06fa3a6a (patch) | |
tree | cfa5692499fd9be856f6830da5138fddec8fb3ea /generic/tclThreadAlloc.c | |
parent | 87733915bfadc0092db52e10e2563abec9ae56b7 (diff) | |
download | tcl-e0c40c81b46bedc9c11d37026800b7fe06fa3a6a.zip tcl-e0c40c81b46bedc9c11d37026800b7fe06fa3a6a.tar.gz tcl-e0c40c81b46bedc9c11d37026800b7fe06fa3a6a.tar.bz2 |
Make [Bug 975895] less likely to be hit
FossilOrigin-Name: a99c5f486a8ac67067df34bff1a5e5f98f32704d
Diffstat (limited to 'generic/tclThreadAlloc.c')
-rwxr-xr-x | generic/tclThreadAlloc.c | 531 |
1 files changed, 274 insertions, 257 deletions
diff --git a/generic/tclThreadAlloc.c b/generic/tclThreadAlloc.c index d18bf3a..8f2b336 100755 --- a/generic/tclThreadAlloc.c +++ b/generic/tclThreadAlloc.c @@ -3,7 +3,7 @@ * * This is a very fast storage allocator for used with threads (designed * avoid lock contention). The basic strategy is to allocate memory in - * fixed size blocks from block caches. + * fixed size blocks from block caches. * * The Initial Developer of the Original Code is America Online, Inc. * Portions created by AOL are Copyright (C) 1999 America Online, Inc. @@ -11,12 +11,12 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclThreadAlloc.c,v 1.12 2004/05/04 20:09:33 dgp Exp $ + * RCS: @(#) $Id: tclThreadAlloc.c,v 1.13 2004/06/21 08:54:34 dkf Exp $ */ #include "tclInt.h" #if defined(TCL_THREADS) && defined(USE_THREAD_ALLOC) - + /* * If range checking is enabled, an additional byte will be allocated * to store the magic number at the end of the requested memory. @@ -34,7 +34,6 @@ * The following define the number of Tcl_Obj's to allocate/move * at a time and the high water mark to prune a per-thread cache. * On a 32 bit system, sizeof(Tcl_Obj) = 24 so 800 * 24 = ~16k. - * */ #define NOBJALLOC 800 @@ -58,21 +57,21 @@ typedef struct Block { union { - struct Block *next; /* Next in free list. */ - struct { - unsigned char magic1; /* First magic number. */ - unsigned char bucket; /* Bucket block allocated from. */ - unsigned char unused; /* Padding. */ - unsigned char magic2; /* Second magic number. */ - } b_s; - } b_u; - size_t b_reqsize; /* Requested allocation size. */ + struct Block *next; /* Next in free list. */ + struct { + unsigned char magic1; /* First magic number. */ + unsigned char bucket; /* Bucket block allocated from. */ + unsigned char unused; /* Padding. */ + unsigned char magic2; /* Second magic number. */ + } s; + } u; + size_t reqSize; /* Requested allocation size. */ } Block; -#define b_next b_u.next -#define b_bucket b_u.b_s.bucket -#define b_magic1 b_u.b_s.magic1 -#define b_magic2 b_u.b_s.magic2 -#define MAGIC 0xef +#define nextBlock u.next +#define sourceBucket u.s.bucket +#define magicNum1 u.s.magic1 +#define magicNum2 u.s.magic2 +#define MAGIC 0xEF /* * The following structure defines a bucket of blocks with @@ -80,40 +79,44 @@ typedef struct Block { */ typedef struct Bucket { - Block *firstPtr; - int nfree; - int nget; - int nput; - int nwait; - int nlock; - int nrequest; + Block *firstPtr; /* First block available */ + int numFree; /* Number of blocks available */ + + /* All fields below for accounting only */ + + int numRemoves; /* Number of removes from bucket */ + int numInserts; /* Number of inserts into bucket */ + int numWaits; /* Number of waits to acquire a lock */ + int numLocks; /* Number of locks acquired */ + int totalAssigned; /* Total space assigned to bucket */ } Bucket; /* - * The following structure defines a cache of buckets and objs. + * The following structure defines a cache of buckets and objs, of + * which there will be (at most) one per thread. */ typedef struct Cache { - struct Cache *nextPtr; - Tcl_ThreadId owner; - Tcl_Obj *firstObjPtr; - int nobjs; - int nsysalloc; - Bucket buckets[NBUCKETS]; + struct Cache *nextPtr; /* Linked list of cache entries */ + Tcl_ThreadId owner; /* Which thread's cache is this? */ + Tcl_Obj *firstObjPtr; /* List of free objects for thread */ + int numObjects; /* Number of objects for thread */ + int totalAssigned; /* Total space assigned to thread */ + Bucket buckets[NBUCKETS]; /* The buckets for this thread */ } Cache; /* - * The following array specifies various per-bucket - * limits and locks. The values are statically initialized - * to avoid calculating them repeatedly. + * The following array specifies various per-bucket limits and locks. + * The values are statically initialized to avoid calculating them + * repeatedly. */ static struct { - size_t blocksize; /* Bucket blocksize. */ - int maxblocks; /* Max blocks before move to share. */ - int nmove; /* Num blocks to move to share. */ - Tcl_Mutex *lockPtr; /* Share bucket lock. */ -} binfo[NBUCKETS] = { + size_t blockSize; /* Bucket blocksize. */ + int maxBlocks; /* Max blocks before move to share. */ + int numMove; /* Num blocks to move to share. */ + Tcl_Mutex *lockPtr; /* Share bucket lock. */ +} bucketInfo[NBUCKETS] = { { 16, 1024, 512, NULL}, { 32, 512, 256, NULL}, { 64, 256, 128, NULL}, @@ -131,13 +134,16 @@ static struct { * Static functions defined in this file. */ -static void LockBucket(Cache *cachePtr, int bucket); -static void UnlockBucket(Cache *cachePtr, int bucket); -static void PutBlocks(Cache *cachePtr, int bucket, int nmove); -static int GetBlocks(Cache *cachePtr, int bucket); -static Block *Ptr2Block(char *ptr); -static char *Block2Ptr(Block *blockPtr, int bucket, unsigned int reqsize); -static void MoveObjs(Cache *fromPtr, Cache *toPtr, int nmove); +static void LockBucket _ANSI_ARGS_((Cache *cachePtr, int bucket)); +static void UnlockBucket _ANSI_ARGS_((Cache *cachePtr, int bucket)); +static void PutBlocks _ANSI_ARGS_((Cache *cachePtr, int bucket, + int numMove)); +static int GetBlocks _ANSI_ARGS_((Cache *cachePtr, int bucket)); +static Block * Ptr2Block _ANSI_ARGS_((char *ptr)); +static char * Block2Ptr _ANSI_ARGS_((Block *blockPtr, int bucket, + unsigned int reqSize)); +static void MoveObjs _ANSI_ARGS_((Cache *fromPtr, Cache *toPtr, + int numMove)); /* * Local variables defined in this file and initialized at @@ -146,15 +152,14 @@ static void MoveObjs(Cache *fromPtr, Cache *toPtr, int nmove); static Tcl_Mutex *listLockPtr; static Tcl_Mutex *objLockPtr; -static Cache sharedCache; -static Cache *sharedPtr = &sharedCache; -static Cache *firstCachePtr = &sharedCache; - +static Cache sharedCache; +static Cache *sharedPtr = &sharedCache; +static Cache *firstCachePtr = &sharedCache; /* *---------------------------------------------------------------------- * - * GetCache --- + * GetCache --- * * Gets per-thread memory cache, allocating it if necessary. * @@ -162,7 +167,7 @@ static Cache *firstCachePtr = &sharedCache; * Pointer to cache. * * Side effects: - * None. + * None. * *---------------------------------------------------------------------- */ @@ -178,7 +183,7 @@ GetCache(void) if (listLockPtr == NULL) { Tcl_Mutex *initLockPtr; - int i; + int i; initLockPtr = Tcl_GetAllocMutex(); Tcl_MutexLock(initLockPtr); @@ -186,7 +191,7 @@ GetCache(void) listLockPtr = TclpNewAllocMutex(); objLockPtr = TclpNewAllocMutex(); for (i = 0; i < NBUCKETS; ++i) { - binfo[i].lockPtr = TclpNewAllocMutex(); + bucketInfo[i].lockPtr = TclpNewAllocMutex(); } } Tcl_MutexUnlock(initLockPtr); @@ -198,25 +203,24 @@ GetCache(void) cachePtr = TclpGetAllocCache(); if (cachePtr == NULL) { - cachePtr = calloc(1, sizeof(Cache)); - if (cachePtr == NULL) { + cachePtr = calloc(1, sizeof(Cache)); + if (cachePtr == NULL) { Tcl_Panic("alloc: could not allocate new cache"); - } - Tcl_MutexLock(listLockPtr); - cachePtr->nextPtr = firstCachePtr; - firstCachePtr = cachePtr; - Tcl_MutexUnlock(listLockPtr); - cachePtr->owner = Tcl_GetCurrentThread(); + } + Tcl_MutexLock(listLockPtr); + cachePtr->nextPtr = firstCachePtr; + firstCachePtr = cachePtr; + Tcl_MutexUnlock(listLockPtr); + cachePtr->owner = Tcl_GetCurrentThread(); TclpSetAllocCache(cachePtr); } return cachePtr; } - /* *---------------------------------------------------------------------- * - * TclFreeAllocCache -- + * TclFreeAllocCache -- * * Flush and delete a cache, removing from list of caches. * @@ -230,19 +234,20 @@ GetCache(void) */ void -TclFreeAllocCache(void *arg) +TclFreeAllocCache(arg) + void *arg; { Cache *cachePtr = arg; Cache **nextPtrPtr; - register int bucket; + register int bucket; /* * Flush blocks. */ for (bucket = 0; bucket < NBUCKETS; ++bucket) { - if (cachePtr->buckets[bucket].nfree > 0) { - PutBlocks(cachePtr, bucket, cachePtr->buckets[bucket].nfree); + if (cachePtr->buckets[bucket].numFree > 0) { + PutBlocks(cachePtr, bucket, cachePtr->buckets[bucket].numFree); } } @@ -250,10 +255,10 @@ TclFreeAllocCache(void *arg) * Flush objs. */ - if (cachePtr->nobjs > 0) { - Tcl_MutexLock(objLockPtr); - MoveObjs(cachePtr, sharedPtr, cachePtr->nobjs); - Tcl_MutexUnlock(objLockPtr); + if (cachePtr->numObjects > 0) { + Tcl_MutexLock(objLockPtr); + MoveObjs(cachePtr, sharedPtr, cachePtr->numObjects); + Tcl_MutexUnlock(objLockPtr); } /* @@ -270,12 +275,11 @@ TclFreeAllocCache(void *arg) Tcl_MutexUnlock(listLockPtr); free(cachePtr); } - /* *---------------------------------------------------------------------- * - * TclpAlloc -- + * TclpAlloc -- * * Allocate memory. * @@ -289,12 +293,13 @@ TclFreeAllocCache(void *arg) */ char * -TclpAlloc(unsigned int reqsize) +TclpAlloc(reqSize) + unsigned int reqSize; { - Cache *cachePtr = TclpGetAllocCache(); - Block *blockPtr; - register int bucket; - size_t size; + Cache *cachePtr = TclpGetAllocCache(); + Block *blockPtr; + register int bucket; + size_t size; if (cachePtr == NULL) { cachePtr = GetCache(); @@ -309,40 +314,39 @@ TclpAlloc(unsigned int reqsize) */ blockPtr = NULL; - size = reqsize + sizeof(Block); + size = reqSize + sizeof(Block); #if RCHECK ++size; #endif if (size > MAXALLOC) { bucket = NBUCKETS; - blockPtr = malloc(size); + blockPtr = malloc(size); if (blockPtr != NULL) { - cachePtr->nsysalloc += reqsize; + cachePtr->totalAssigned += reqSize; } } else { - bucket = 0; - while (binfo[bucket].blocksize < size) { - ++bucket; - } - if (cachePtr->buckets[bucket].nfree || GetBlocks(cachePtr, bucket)) { + bucket = 0; + while (bucketInfo[bucket].blockSize < size) { + ++bucket; + } + if (cachePtr->buckets[bucket].numFree || GetBlocks(cachePtr, bucket)) { blockPtr = cachePtr->buckets[bucket].firstPtr; - cachePtr->buckets[bucket].firstPtr = blockPtr->b_next; - --cachePtr->buckets[bucket].nfree; - ++cachePtr->buckets[bucket].nget; - cachePtr->buckets[bucket].nrequest += reqsize; + cachePtr->buckets[bucket].firstPtr = blockPtr->nextBlock; + --cachePtr->buckets[bucket].numFree; + ++cachePtr->buckets[bucket].numRemoves; + cachePtr->buckets[bucket].totalAssigned += reqSize; } } if (blockPtr == NULL) { - return NULL; + return NULL; } - return Block2Ptr(blockPtr, bucket, reqsize); + return Block2Ptr(blockPtr, bucket, reqSize); } - /* *---------------------------------------------------------------------- * - * TclpFree -- + * TclpFree -- * * Return blocks to the thread block cache. * @@ -356,49 +360,51 @@ TclpAlloc(unsigned int reqsize) */ void -TclpFree(char *ptr) +TclpFree(ptr) + char *ptr; { - if (ptr != NULL) { - Cache *cachePtr = TclpGetAllocCache(); - Block *blockPtr; - int bucket; + Cache *cachePtr; + Block *blockPtr; + int bucket; - if (cachePtr == NULL) { - cachePtr = GetCache(); - } + if (ptr == NULL) { + return; + } - /* - * Get the block back from the user pointer and - * call system free directly for large blocks. - * Otherwise, push the block back on the bucket and - * move blocks to the shared cache if there are now - * too many free. - */ + cachePtr = TclpGetAllocCache(); + if (cachePtr == NULL) { + cachePtr = GetCache(); + } - blockPtr = Ptr2Block(ptr); - bucket = blockPtr->b_bucket; - if (bucket == NBUCKETS) { - cachePtr->nsysalloc -= blockPtr->b_reqsize; - free(blockPtr); - } else { - cachePtr->buckets[bucket].nrequest -= blockPtr->b_reqsize; - blockPtr->b_next = cachePtr->buckets[bucket].firstPtr; - cachePtr->buckets[bucket].firstPtr = blockPtr; - ++cachePtr->buckets[bucket].nfree; - ++cachePtr->buckets[bucket].nput; - if (cachePtr != sharedPtr && - cachePtr->buckets[bucket].nfree > binfo[bucket].maxblocks) { - PutBlocks(cachePtr, bucket, binfo[bucket].nmove); - } - } + /* + * Get the block back from the user pointer and call system free + * directly for large blocks. Otherwise, push the block back on + * the bucket and move blocks to the shared cache if there are now + * too many free. + */ + + blockPtr = Ptr2Block(ptr); + bucket = blockPtr->sourceBucket; + if (bucket == NBUCKETS) { + cachePtr->totalAssigned -= blockPtr->reqSize; + free(blockPtr); + return; + } + cachePtr->buckets[bucket].totalAssigned -= blockPtr->reqSize; + blockPtr->nextBlock = cachePtr->buckets[bucket].firstPtr; + cachePtr->buckets[bucket].firstPtr = blockPtr; + ++cachePtr->buckets[bucket].numFree; + ++cachePtr->buckets[bucket].numInserts; + if (cachePtr != sharedPtr && + cachePtr->buckets[bucket].numFree > bucketInfo[bucket].maxBlocks) { + PutBlocks(cachePtr, bucket, bucketInfo[bucket].numMove); } } - /* *---------------------------------------------------------------------- * - * TclpRealloc -- + * TclpRealloc -- * * Re-allocate memory to a larger or smaller size. * @@ -412,7 +418,9 @@ TclpFree(char *ptr) */ char * -TclpRealloc(char *ptr, unsigned int reqsize) +TclpRealloc(ptr, reqSize) + char *ptr; + unsigned int reqSize; { Cache *cachePtr = TclpGetAllocCache(); Block *blockPtr; @@ -421,7 +429,7 @@ TclpRealloc(char *ptr, unsigned int reqsize) int bucket; if (ptr == NULL) { - return TclpAlloc(reqsize); + return TclpAlloc(reqSize); } if (cachePtr == NULL) { @@ -436,47 +444,46 @@ TclpRealloc(char *ptr, unsigned int reqsize) */ blockPtr = Ptr2Block(ptr); - size = reqsize + sizeof(Block); + size = reqSize + sizeof(Block); #if RCHECK ++size; #endif - bucket = blockPtr->b_bucket; + bucket = blockPtr->sourceBucket; if (bucket != NBUCKETS) { if (bucket > 0) { - min = binfo[bucket-1].blocksize; + min = bucketInfo[bucket-1].blockSize; } else { min = 0; } - if (size > min && size <= binfo[bucket].blocksize) { - cachePtr->buckets[bucket].nrequest -= blockPtr->b_reqsize; - cachePtr->buckets[bucket].nrequest += reqsize; - return Block2Ptr(blockPtr, bucket, reqsize); + if (size > min && size <= bucketInfo[bucket].blockSize) { + cachePtr->buckets[bucket].totalAssigned -= blockPtr->reqSize; + cachePtr->buckets[bucket].totalAssigned += reqSize; + return Block2Ptr(blockPtr, bucket, reqSize); } } else if (size > MAXALLOC) { - cachePtr->nsysalloc -= blockPtr->b_reqsize; - cachePtr->nsysalloc += reqsize; + cachePtr->totalAssigned -= blockPtr->reqSize; + cachePtr->totalAssigned += reqSize; blockPtr = realloc(blockPtr, size); if (blockPtr == NULL) { return NULL; } - return Block2Ptr(blockPtr, NBUCKETS, reqsize); + return Block2Ptr(blockPtr, NBUCKETS, reqSize); } /* * Finally, perform an expensive malloc/copy/free. */ - new = TclpAlloc(reqsize); + new = TclpAlloc(reqSize); if (new != NULL) { - if (reqsize > blockPtr->b_reqsize) { - reqsize = blockPtr->b_reqsize; + if (reqSize > blockPtr->reqSize) { + reqSize = blockPtr->reqSize; } - memcpy(new, ptr, reqsize); - TclpFree(ptr); + memcpy(new, ptr, reqSize); + TclpFree(ptr); } return new; } - /* *---------------------------------------------------------------------- @@ -490,7 +497,7 @@ TclpRealloc(char *ptr, unsigned int reqsize) * * Side effects: * May move Tcl_Obj's from shared cached or allocate new Tcl_Obj's - * if list is empty. + * if list is empty. * *---------------------------------------------------------------------- */ @@ -499,7 +506,7 @@ Tcl_Obj * TclThreadAllocObj(void) { register Cache *cachePtr = TclpGetAllocCache(); - register int nmove; + register int numMove; register Tcl_Obj *objPtr; Tcl_Obj *newObjsPtr; @@ -512,24 +519,24 @@ TclThreadAllocObj(void) * or allocate new objs if necessary. */ - if (cachePtr->nobjs == 0) { - Tcl_MutexLock(objLockPtr); - nmove = sharedPtr->nobjs; - if (nmove > 0) { - if (nmove > NOBJALLOC) { - nmove = NOBJALLOC; + if (cachePtr->numObjects == 0) { + Tcl_MutexLock(objLockPtr); + numMove = sharedPtr->numObjects; + if (numMove > 0) { + if (numMove > NOBJALLOC) { + numMove = NOBJALLOC; } - MoveObjs(sharedPtr, cachePtr, nmove); + MoveObjs(sharedPtr, cachePtr, numMove); } - Tcl_MutexUnlock(objLockPtr); - if (cachePtr->nobjs == 0) { - cachePtr->nobjs = nmove = NOBJALLOC; - newObjsPtr = malloc(sizeof(Tcl_Obj) * nmove); + Tcl_MutexUnlock(objLockPtr); + if (cachePtr->numObjects == 0) { + cachePtr->numObjects = numMove = NOBJALLOC; + newObjsPtr = malloc(sizeof(Tcl_Obj) * numMove); if (newObjsPtr == NULL) { - Tcl_Panic("alloc: could not allocate %d new objects", nmove); + Tcl_Panic("alloc: could not allocate %d new objects", numMove); } - while (--nmove >= 0) { - objPtr = &newObjsPtr[nmove]; + while (--numMove >= 0) { + objPtr = &newObjsPtr[numMove]; objPtr->internalRep.otherValuePtr = cachePtr->firstObjPtr; cachePtr->firstObjPtr = objPtr; } @@ -542,10 +549,9 @@ TclThreadAllocObj(void) objPtr = cachePtr->firstObjPtr; cachePtr->firstObjPtr = objPtr->internalRep.otherValuePtr; - --cachePtr->nobjs; + --cachePtr->numObjects; return objPtr; } - /* *---------------------------------------------------------------------- @@ -559,13 +565,14 @@ TclThreadAllocObj(void) * * Side effects: * May move free Tcl_Obj's to shared list upon hitting high - * water mark. + * water mark. * *---------------------------------------------------------------------- */ void -TclThreadFreeObj(Tcl_Obj *objPtr) +TclThreadFreeObj(objPtr) + Tcl_Obj *objPtr; { Cache *cachePtr = TclpGetAllocCache(); @@ -579,20 +586,19 @@ TclThreadFreeObj(Tcl_Obj *objPtr) objPtr->internalRep.otherValuePtr = cachePtr->firstObjPtr; cachePtr->firstObjPtr = objPtr; - ++cachePtr->nobjs; + ++cachePtr->numObjects; /* * If the number of free objects has exceeded the high * water mark, move some blocks to the shared list. */ - if (cachePtr->nobjs > NOBJHIGH) { + if (cachePtr->numObjects > NOBJHIGH) { Tcl_MutexLock(objLockPtr); MoveObjs(cachePtr, sharedPtr, NOBJALLOC); Tcl_MutexUnlock(objLockPtr); } } - /* *---------------------------------------------------------------------- @@ -605,13 +611,14 @@ TclThreadFreeObj(Tcl_Obj *objPtr) * None. * * Side effects: - * List appended to given dstring. + * List appended to given dstring. * *---------------------------------------------------------------------- */ void -Tcl_GetMemoryInfo(Tcl_DString *dsPtr) +Tcl_GetMemoryInfo(dsPtr) + Tcl_DString *dsPtr; { Cache *cachePtr; char buf[200]; @@ -622,28 +629,27 @@ Tcl_GetMemoryInfo(Tcl_DString *dsPtr) while (cachePtr != NULL) { Tcl_DStringStartSublist(dsPtr); if (cachePtr == sharedPtr) { - Tcl_DStringAppendElement(dsPtr, "shared"); + Tcl_DStringAppendElement(dsPtr, "shared"); } else { sprintf(buf, "thread%d", (int) cachePtr->owner); - Tcl_DStringAppendElement(dsPtr, buf); + Tcl_DStringAppendElement(dsPtr, buf); } for (n = 0; n < NBUCKETS; ++n) { - sprintf(buf, "%d %d %d %d %d %d %d", - (int) binfo[n].blocksize, - cachePtr->buckets[n].nfree, - cachePtr->buckets[n].nget, - cachePtr->buckets[n].nput, - cachePtr->buckets[n].nrequest, - cachePtr->buckets[n].nlock, - cachePtr->buckets[n].nwait); + sprintf(buf, "%d %d %d %d %d %d %d", + (int) bucketInfo[n].blockSize, + cachePtr->buckets[n].numFree, + cachePtr->buckets[n].numRemoves, + cachePtr->buckets[n].numInserts, + cachePtr->buckets[n].totalAssigned, + cachePtr->buckets[n].numLocks, + cachePtr->buckets[n].numWaits); Tcl_DStringAppendElement(dsPtr, buf); } Tcl_DStringEndSublist(dsPtr); - cachePtr = cachePtr->nextPtr; + cachePtr = cachePtr->nextPtr; } Tcl_MutexUnlock(listLockPtr); } - /* *---------------------------------------------------------------------- @@ -656,19 +662,21 @@ Tcl_GetMemoryInfo(Tcl_DString *dsPtr) * None. * * Side effects: - * None. + * None. * *---------------------------------------------------------------------- */ static void -MoveObjs(Cache *fromPtr, Cache *toPtr, int nmove) +MoveObjs(fromPtr, toPtr, numMove) + Cache *fromPtr, *toPtr; + int numMove; { register Tcl_Obj *objPtr = fromPtr->firstObjPtr; Tcl_Obj *fromFirstObjPtr = objPtr; - toPtr->nobjs += nmove; - fromPtr->nobjs -= nmove; + toPtr->numObjects += numMove; + fromPtr->numObjects -= numMove; /* * Find the last object to be moved; set the next one @@ -676,7 +684,7 @@ MoveObjs(Cache *fromPtr, Cache *toPtr, int nmove) * in the 'from' cache. */ - while (--nmove) { + while (--numMove) { objPtr = objPtr->internalRep.otherValuePtr; } fromPtr->firstObjPtr = objPtr->internalRep.otherValuePtr; @@ -689,12 +697,11 @@ MoveObjs(Cache *fromPtr, Cache *toPtr, int nmove) objPtr->internalRep.otherValuePtr = toPtr->firstObjPtr; toPtr->firstObjPtr = fromFirstObjPtr; } - /* *---------------------------------------------------------------------- * - * Block2Ptr, Ptr2Block -- + * Block2Ptr, Ptr2Block -- * * Convert between internal blocks and user pointers. * @@ -708,84 +715,91 @@ MoveObjs(Cache *fromPtr, Cache *toPtr, int nmove) */ static char * -Block2Ptr(Block *blockPtr, int bucket, unsigned int reqsize) +Block2Ptr(blockPtr, bucket, reqSize) + Block *blockPtr; + int bucket; + unsigned int reqSize; { register void *ptr; - blockPtr->b_magic1 = blockPtr->b_magic2 = MAGIC; - blockPtr->b_bucket = bucket; - blockPtr->b_reqsize = reqsize; + blockPtr->magicNum1 = blockPtr->magicNum2 = MAGIC; + blockPtr->sourceBucket = bucket; + blockPtr->reqSize = reqSize; ptr = ((void *) (blockPtr + 1)); #if RCHECK - ((unsigned char *)(ptr))[reqsize] = MAGIC; + ((unsigned char *)(ptr))[reqSize] = MAGIC; #endif return (char *) ptr; } static Block * -Ptr2Block(char *ptr) +Ptr2Block(ptr) + char *ptr; { register Block *blockPtr; blockPtr = (((Block *) ptr) - 1); - if (blockPtr->b_magic1 != MAGIC + if (blockPtr->magicNum1 != MAGIC || blockPtr->magicNum2 != MAGIC) { + Tcl_Panic("alloc: invalid block: %p: %x %x\n", + blockPtr, blockPtr->magicNum1, blockPtr->magicNum2); + } #if RCHECK - || ((unsigned char *) ptr)[blockPtr->b_reqsize] != MAGIC -#endif - || blockPtr->b_magic2 != MAGIC) { + if (((unsigned char *) ptr)[blockPtr->reqSize] != MAGIC) { Tcl_Panic("alloc: invalid block: %p: %x %x %x\n", - blockPtr, blockPtr->b_magic1, blockPtr->b_magic2, - ((unsigned char *) ptr)[blockPtr->b_reqsize]); + blockPtr, blockPtr->magicNum1, blockPtr->magicNum2, + ((unsigned char *) ptr)[blockPtr->reqSize]); } +#endif return blockPtr; } - /* *---------------------------------------------------------------------- * - * LockBucket, UnlockBucket -- + * LockBucket, UnlockBucket -- * * Set/unset the lock to access a bucket in the shared cache. * * Results: - * None. + * None. * * Side effects: * Lock activity and contention are monitored globally and on - * a per-cache basis. + * a per-cache basis. * *---------------------------------------------------------------------- */ static void -LockBucket(Cache *cachePtr, int bucket) +LockBucket(cachePtr, bucket) + Cache *cachePtr; + int bucket; { #if 0 - if (Tcl_MutexTryLock(binfo[bucket].lockPtr) != TCL_OK) { - Tcl_MutexLock(binfo[bucket].lockPtr); - ++cachePtr->buckets[bucket].nwait; - ++sharedPtr->buckets[bucket].nwait; + if (Tcl_MutexTryLock(bucketInfo[bucket].lockPtr) != TCL_OK) { + Tcl_MutexLock(bucketInfo[bucket].lockPtr); + ++cachePtr->buckets[bucket].numWaits; + ++sharedPtr->buckets[bucket].numWaits; } #else - Tcl_MutexLock(binfo[bucket].lockPtr); + Tcl_MutexLock(bucketInfo[bucket].lockPtr); #endif - ++cachePtr->buckets[bucket].nlock; - ++sharedPtr->buckets[bucket].nlock; + ++cachePtr->buckets[bucket].numLocks; + ++sharedPtr->buckets[bucket].numLocks; } - static void -UnlockBucket(Cache *cachePtr, int bucket) +UnlockBucket(cachePtr, bucket) + Cache *cachePtr; + int bucket; { - Tcl_MutexUnlock(binfo[bucket].lockPtr); + Tcl_MutexUnlock(bucketInfo[bucket].lockPtr); } - /* *---------------------------------------------------------------------- * - * PutBlocks -- + * PutBlocks -- * * Return unused blocks to the shared cache. * @@ -799,10 +813,12 @@ UnlockBucket(Cache *cachePtr, int bucket) */ static void -PutBlocks(Cache *cachePtr, int bucket, int nmove) +PutBlocks(cachePtr, bucket, numMove) + Cache *cachePtr; + int bucket, numMove; { register Block *lastPtr, *firstPtr; - register int n = nmove; + register int n = numMove; /* * Before acquiring the lock, walk the block list to find @@ -811,10 +827,10 @@ PutBlocks(Cache *cachePtr, int bucket, int nmove) firstPtr = lastPtr = cachePtr->buckets[bucket].firstPtr; while (--n > 0) { - lastPtr = lastPtr->b_next; + lastPtr = lastPtr->nextBlock; } - cachePtr->buckets[bucket].firstPtr = lastPtr->b_next; - cachePtr->buckets[bucket].nfree -= nmove; + cachePtr->buckets[bucket].firstPtr = lastPtr->nextBlock; + cachePtr->buckets[bucket].numFree -= numMove; /* * Aquire the lock and place the list of blocks at the front @@ -822,17 +838,16 @@ PutBlocks(Cache *cachePtr, int bucket, int nmove) */ LockBucket(cachePtr, bucket); - lastPtr->b_next = sharedPtr->buckets[bucket].firstPtr; + lastPtr->nextBlock = sharedPtr->buckets[bucket].firstPtr; sharedPtr->buckets[bucket].firstPtr = firstPtr; - sharedPtr->buckets[bucket].nfree += nmove; + sharedPtr->buckets[bucket].numFree += numMove; UnlockBucket(cachePtr, bucket); } - /* *---------------------------------------------------------------------- * - * GetBlocks -- + * GetBlocks -- * * Get more blocks for a bucket. * @@ -846,7 +861,9 @@ PutBlocks(Cache *cachePtr, int bucket, int nmove) */ static int -GetBlocks(Cache *cachePtr, int bucket) +GetBlocks(cachePtr, bucket) + Cache *cachePtr; + int bucket; { register Block *blockPtr; register int n; @@ -854,59 +871,59 @@ GetBlocks(Cache *cachePtr, int bucket) /* * First, atttempt to move blocks from the shared cache. Note - * the potentially dirty read of nfree before acquiring the lock + * the potentially dirty read of numFree before acquiring the lock * which is a slight performance enhancement. The value is * verified after the lock is actually acquired. */ - if (cachePtr != sharedPtr && sharedPtr->buckets[bucket].nfree > 0) { + if (cachePtr != sharedPtr && sharedPtr->buckets[bucket].numFree > 0) { LockBucket(cachePtr, bucket); - if (sharedPtr->buckets[bucket].nfree > 0) { + if (sharedPtr->buckets[bucket].numFree > 0) { /* * Either move the entire list or walk the list to find * the last block to move. */ - n = binfo[bucket].nmove; - if (n >= sharedPtr->buckets[bucket].nfree) { + n = bucketInfo[bucket].numMove; + if (n >= sharedPtr->buckets[bucket].numFree) { cachePtr->buckets[bucket].firstPtr = - sharedPtr->buckets[bucket].firstPtr; - cachePtr->buckets[bucket].nfree = - sharedPtr->buckets[bucket].nfree; + sharedPtr->buckets[bucket].firstPtr; + cachePtr->buckets[bucket].numFree = + sharedPtr->buckets[bucket].numFree; sharedPtr->buckets[bucket].firstPtr = NULL; - sharedPtr->buckets[bucket].nfree = 0; + sharedPtr->buckets[bucket].numFree = 0; } else { blockPtr = sharedPtr->buckets[bucket].firstPtr; cachePtr->buckets[bucket].firstPtr = blockPtr; - sharedPtr->buckets[bucket].nfree -= n; - cachePtr->buckets[bucket].nfree = n; + sharedPtr->buckets[bucket].numFree -= n; + cachePtr->buckets[bucket].numFree = n; while (--n > 0) { - blockPtr = blockPtr->b_next; + blockPtr = blockPtr->nextBlock; } - sharedPtr->buckets[bucket].firstPtr = blockPtr->b_next; - blockPtr->b_next = NULL; + sharedPtr->buckets[bucket].firstPtr = blockPtr->nextBlock; + blockPtr->nextBlock = NULL; } } UnlockBucket(cachePtr, bucket); } - if (cachePtr->buckets[bucket].nfree == 0) { + if (cachePtr->buckets[bucket].numFree == 0) { /* * If no blocks could be moved from shared, first look for a * larger block in this cache to split up. */ - blockPtr = NULL; + blockPtr = NULL; n = NBUCKETS; size = 0; /* lint */ while (--n > bucket) { - if (cachePtr->buckets[n].nfree > 0) { - size = binfo[n].blocksize; + if (cachePtr->buckets[n].numFree > 0) { + size = bucketInfo[n].blockSize; blockPtr = cachePtr->buckets[n].firstPtr; - cachePtr->buckets[n].firstPtr = blockPtr->b_next; - --cachePtr->buckets[n].nfree; + cachePtr->buckets[n].firstPtr = blockPtr->nextBlock; + --cachePtr->buckets[n].numFree; break; } } @@ -927,17 +944,17 @@ GetBlocks(Cache *cachePtr, int bucket) * Split the larger block into smaller blocks for this bucket. */ - n = size / binfo[bucket].blocksize; - cachePtr->buckets[bucket].nfree = n; + n = size / bucketInfo[bucket].blockSize; + cachePtr->buckets[bucket].numFree = n; cachePtr->buckets[bucket].firstPtr = blockPtr; while (--n > 0) { - blockPtr->b_next = (Block *) - ((char *) blockPtr + binfo[bucket].blocksize); - blockPtr = blockPtr->b_next; + blockPtr->nextBlock = (Block *) + ((char *) blockPtr + bucketInfo[bucket].blockSize); + blockPtr = blockPtr->nextBlock; } - blockPtr->b_next = NULL; + blockPtr->nextBlock = NULL; } return 1; } - + #endif /* TCL_THREADS */ |