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-rw-r--r--generic/tclThreadAlloc.c119
1 files changed, 98 insertions, 21 deletions
diff --git a/generic/tclThreadAlloc.c b/generic/tclThreadAlloc.c
index 560556d..3267a0d 100644
--- a/generic/tclThreadAlloc.c
+++ b/generic/tclThreadAlloc.c
@@ -84,6 +84,7 @@ typedef union Block {
typedef struct Bucket {
Block *firstPtr; /* First block available */
+ Block *lastPtr; /* End of block list */
long numFree; /* Number of blocks available */
/* All fields below for accounting only */
@@ -107,6 +108,7 @@ typedef struct Cache {
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 */
+ Tcl_Obj *lastPtr; /* Last object in this cache */
int totalAssigned; /* Total space assigned to thread */
Bucket buckets[NBUCKETS]; /* The buckets for this thread */
} Cache;
@@ -135,6 +137,7 @@ 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 numMove);
+static void PutObjs(Cache *fromPtr, int numMove);
/*
* Local variables defined in this file and initialized at startup.
@@ -271,9 +274,7 @@ TclFreeAllocCache(
*/
if (cachePtr->numObjects > 0) {
- Tcl_MutexLock(objLockPtr);
- MoveObjs(cachePtr, sharedPtr, cachePtr->numObjects);
- Tcl_MutexUnlock(objLockPtr);
+ PutObjs(cachePtr, cachePtr->numObjects);
}
/*
@@ -415,6 +416,9 @@ TclpFree(
cachePtr->buckets[bucket].totalAssigned -= blockPtr->blockReqSize;
blockPtr->nextBlock = cachePtr->buckets[bucket].firstPtr;
cachePtr->buckets[bucket].firstPtr = blockPtr;
+ if (cachePtr->buckets[bucket].numFree == 0) {
+ cachePtr->buckets[bucket].lastPtr = blockPtr;
+ }
cachePtr->buckets[bucket].numFree++;
cachePtr->buckets[bucket].numInserts++;
@@ -572,11 +576,13 @@ TclThreadAllocObj(void)
if (newObjsPtr == NULL) {
Tcl_Panic("alloc: could not allocate %d new objects", numMove);
}
+ cachePtr->lastPtr = newObjsPtr + numMove - 1;
+ objPtr = cachePtr->firstObjPtr; /* NULL */
while (--numMove >= 0) {
- objPtr = &newObjsPtr[numMove];
- objPtr->internalRep.twoPtrValue.ptr1 = cachePtr->firstObjPtr;
- cachePtr->firstObjPtr = objPtr;
+ newObjsPtr[numMove].internalRep.twoPtrValue.ptr1 = objPtr;
+ objPtr = newObjsPtr + numMove;
}
+ cachePtr->firstObjPtr = newObjsPtr;
}
}
@@ -624,6 +630,9 @@ TclThreadFreeObj(
objPtr->internalRep.twoPtrValue.ptr1 = cachePtr->firstObjPtr;
cachePtr->firstObjPtr = objPtr;
+ if (cachePtr->numObjects == 0) {
+ cachePtr->lastPtr = objPtr;
+ }
cachePtr->numObjects++;
/*
@@ -632,9 +641,7 @@ TclThreadFreeObj(
*/
if (cachePtr->numObjects > NOBJHIGH) {
- Tcl_MutexLock(objLockPtr);
- MoveObjs(cachePtr, sharedPtr, NOBJALLOC);
- Tcl_MutexUnlock(objLockPtr);
+ PutObjs(cachePtr, NOBJALLOC);
}
}
@@ -732,13 +739,67 @@ MoveObjs(
* just have to update the first and last.
*/
- objPtr->internalRep.twoPtrValue.ptr1 = toPtr->firstObjPtr;
+ toPtr->lastPtr = objPtr;
+ objPtr->internalRep.twoPtrValue.ptr1 = toPtr->firstObjPtr; /* NULL */
toPtr->firstObjPtr = fromFirstObjPtr;
}
/*
*----------------------------------------------------------------------
*
+ * PutObjs --
+ *
+ * Move Tcl_Obj's from thread cache to shared cache.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+PutObjs(
+ Cache *fromPtr,
+ int numMove)
+{
+ int keep = fromPtr->numObjects - numMove;
+ Tcl_Obj *firstPtr, *lastPtr = NULL;
+
+ fromPtr->numObjects = keep;
+ firstPtr = fromPtr->firstObjPtr;
+ if (keep == 0) {
+ fromPtr->firstObjPtr = NULL;
+ } else {
+ do {
+ lastPtr = firstPtr;
+ firstPtr = firstPtr->internalRep.twoPtrValue.ptr1;
+ } while (--keep > 0);
+ lastPtr->internalRep.twoPtrValue.ptr1 = NULL;
+ }
+
+ /*
+ * Move all objects as a block - they are already linked to each other, we
+ * just have to update the first and last.
+ */
+
+ Tcl_MutexLock(objLockPtr);
+ fromPtr->lastPtr->internalRep.twoPtrValue.ptr1 = sharedPtr->firstObjPtr;
+ sharedPtr->firstObjPtr = firstPtr;
+ if (sharedPtr->numObjects == 0) {
+ sharedPtr->lastPtr = fromPtr->lastPtr;
+ }
+ sharedPtr->numObjects += numMove;
+ Tcl_MutexUnlock(objLockPtr);
+
+ fromPtr->lastPtr = lastPtr;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
* Block2Ptr, Ptr2Block --
*
* Convert between internal blocks and user pointers.
@@ -848,20 +909,25 @@ PutBlocks(
int bucket,
int numMove)
{
- register Block *lastPtr, *firstPtr;
- register int n = numMove;
-
/*
- * Before acquiring the lock, walk the block list to find the last block
- * to be moved.
+ * We have numFree. Want to shed numMove. So compute how many
+ * Blocks to keep.
*/
- firstPtr = lastPtr = cachePtr->buckets[bucket].firstPtr;
- while (--n > 0) {
- lastPtr = lastPtr->nextBlock;
+ int keep = cachePtr->buckets[bucket].numFree - numMove;
+ Block *lastPtr = NULL, *firstPtr;
+
+ cachePtr->buckets[bucket].numFree = keep;
+ firstPtr = cachePtr->buckets[bucket].firstPtr;
+ if (keep == 0) {
+ cachePtr->buckets[bucket].firstPtr = NULL;
+ } else {
+ do {
+ lastPtr = firstPtr;
+ firstPtr = firstPtr->nextBlock;
+ } while (--keep > 0);
+ lastPtr->nextBlock = NULL;
}
- cachePtr->buckets[bucket].firstPtr = lastPtr->nextBlock;
- cachePtr->buckets[bucket].numFree -= numMove;
/*
* Aquire the lock and place the list of blocks at the front of the shared
@@ -869,10 +935,17 @@ PutBlocks(
*/
LockBucket(cachePtr, bucket);
- lastPtr->nextBlock = sharedPtr->buckets[bucket].firstPtr;
+ cachePtr->buckets[bucket].lastPtr->nextBlock
+ = sharedPtr->buckets[bucket].firstPtr;
sharedPtr->buckets[bucket].firstPtr = firstPtr;
+ if (sharedPtr->buckets[bucket].numFree == 0) {
+ sharedPtr->buckets[bucket].lastPtr
+ = cachePtr->buckets[bucket].lastPtr;
+ }
sharedPtr->buckets[bucket].numFree += numMove;
UnlockBucket(cachePtr, bucket);
+
+ cachePtr->buckets[bucket].lastPtr = lastPtr;
}
/*
@@ -919,6 +992,8 @@ GetBlocks(
if (n >= sharedPtr->buckets[bucket].numFree) {
cachePtr->buckets[bucket].firstPtr =
sharedPtr->buckets[bucket].firstPtr;
+ cachePtr->buckets[bucket].lastPtr =
+ sharedPtr->buckets[bucket].lastPtr;
cachePtr->buckets[bucket].numFree =
sharedPtr->buckets[bucket].numFree;
sharedPtr->buckets[bucket].firstPtr = NULL;
@@ -932,6 +1007,7 @@ GetBlocks(
blockPtr = blockPtr->nextBlock;
}
sharedPtr->buckets[bucket].firstPtr = blockPtr->nextBlock;
+ cachePtr->buckets[bucket].lastPtr = blockPtr;
blockPtr->nextBlock = NULL;
}
}
@@ -983,6 +1059,7 @@ GetBlocks(
((char *) blockPtr + bucketInfo[bucket].blockSize);
blockPtr = blockPtr->nextBlock;
}
+ cachePtr->buckets[bucket].lastPtr = blockPtr;
blockPtr->nextBlock = NULL;
}
return 1;
generated by cgit v0.12 at 2024-07-17 19:46:20 (GMT)