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-rw-r--r--[-rwxr-xr-x]generic/tclThreadAlloc.c144
1 files changed, 98 insertions, 46 deletions
diff --git a/generic/tclThreadAlloc.c b/generic/tclThreadAlloc.c
index ba30637..ddf888a 100755..100644
--- a/generic/tclThreadAlloc.c
+++ b/generic/tclThreadAlloc.c
@@ -10,8 +10,6 @@
*
* 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 1.29 2009/01/09 11:21:46 dkf Exp $
*/
#include "tclInt.h"
@@ -147,6 +145,26 @@ static Tcl_Mutex *objLockPtr;
static Cache sharedCache;
static Cache *sharedPtr = &sharedCache;
static Cache *firstCachePtr = &sharedCache;
+
+#if defined(HAVE_FAST_TSD)
+static __thread Cache *tcachePtr;
+
+# define GETCACHE(cachePtr) \
+ do { \
+ if (!tcachePtr) { \
+ tcachePtr = GetCache(); \
+ } \
+ (cachePtr) = tcachePtr; \
+ } while (0)
+#else
+# define GETCACHE(cachePtr) \
+ do { \
+ (cachePtr) = TclpGetAllocCache(); \
+ if ((cachePtr) == NULL) { \
+ (cachePtr) = GetCache(); \
+ } \
+ } while (0)
+#endif
/*
*----------------------------------------------------------------------
@@ -292,14 +310,25 @@ char *
TclpAlloc(
unsigned int reqSize)
{
- Cache *cachePtr = TclpGetAllocCache();
+ Cache *cachePtr;
Block *blockPtr;
register int bucket;
size_t size;
- if (cachePtr == NULL) {
- cachePtr = GetCache();
+#ifndef __LP64__
+ if (sizeof(int) >= sizeof(size_t)) {
+ /* An unsigned int overflow can also be a size_t overflow */
+ const size_t zero = 0;
+ const size_t max = ~zero;
+
+ if (((size_t) reqSize) > max - sizeof(Block) - RCHECK) {
+ /* Requested allocation exceeds memory */
+ return NULL;
+ }
}
+#endif
+
+ GETCACHE(cachePtr);
/*
* Increment the requested size to include room for the Block structure.
@@ -311,7 +340,7 @@ TclpAlloc(
blockPtr = NULL;
size = reqSize + sizeof(Block);
#if RCHECK
- ++size;
+ size++;
#endif
if (size > MAXALLOC) {
bucket = NBUCKETS;
@@ -322,13 +351,13 @@ TclpAlloc(
} else {
bucket = 0;
while (bucketInfo[bucket].blockSize < size) {
- ++bucket;
+ bucket++;
}
if (cachePtr->buckets[bucket].numFree || GetBlocks(cachePtr, bucket)) {
blockPtr = cachePtr->buckets[bucket].firstPtr;
cachePtr->buckets[bucket].firstPtr = blockPtr->nextBlock;
- --cachePtr->buckets[bucket].numFree;
- ++cachePtr->buckets[bucket].numRemoves;
+ cachePtr->buckets[bucket].numFree--;
+ cachePtr->buckets[bucket].numRemoves++;
cachePtr->buckets[bucket].totalAssigned += reqSize;
}
}
@@ -366,10 +395,7 @@ TclpFree(
return;
}
- cachePtr = TclpGetAllocCache();
- if (cachePtr == NULL) {
- cachePtr = GetCache();
- }
+ GETCACHE(cachePtr);
/*
* Get the block back from the user pointer and call system free directly
@@ -388,8 +414,8 @@ TclpFree(
cachePtr->buckets[bucket].totalAssigned -= blockPtr->blockReqSize;
blockPtr->nextBlock = cachePtr->buckets[bucket].firstPtr;
cachePtr->buckets[bucket].firstPtr = blockPtr;
- ++cachePtr->buckets[bucket].numFree;
- ++cachePtr->buckets[bucket].numInserts;
+ cachePtr->buckets[bucket].numFree++;
+ cachePtr->buckets[bucket].numInserts++;
if (cachePtr != sharedPtr &&
cachePtr->buckets[bucket].numFree > bucketInfo[bucket].maxBlocks) {
@@ -418,7 +444,7 @@ TclpRealloc(
char *ptr,
unsigned int reqSize)
{
- Cache *cachePtr = TclpGetAllocCache();
+ Cache *cachePtr;
Block *blockPtr;
void *newPtr;
size_t size, min;
@@ -428,9 +454,20 @@ TclpRealloc(
return TclpAlloc(reqSize);
}
- if (cachePtr == NULL) {
- cachePtr = GetCache();
+#ifndef __LP64__
+ if (sizeof(int) >= sizeof(size_t)) {
+ /* An unsigned int overflow can also be a size_t overflow */
+ const size_t zero = 0;
+ const size_t max = ~zero;
+
+ if (((size_t) reqSize) > max - sizeof(Block) - RCHECK) {
+ /* Requested allocation exceeds memory */
+ return NULL;
+ }
}
+#endif
+
+ GETCACHE(cachePtr);
/*
* If the block is not a system block and fits in place, simply return the
@@ -441,7 +478,7 @@ TclpRealloc(
blockPtr = Ptr2Block(ptr);
size = reqSize + sizeof(Block);
#if RCHECK
- ++size;
+ size++;
#endif
bucket = blockPtr->sourceBucket;
if (bucket != NBUCKETS) {
@@ -504,12 +541,10 @@ TclpRealloc(
Tcl_Obj *
TclThreadAllocObj(void)
{
- register Cache *cachePtr = TclpGetAllocCache();
+ register Cache *cachePtr;
register Tcl_Obj *objPtr;
- if (cachePtr == NULL) {
- cachePtr = GetCache();
- }
+ GETCACHE(cachePtr);
/*
* Get this thread's obj list structure and move or allocate new objs if
@@ -538,7 +573,7 @@ TclThreadAllocObj(void)
}
while (--numMove >= 0) {
objPtr = &newObjsPtr[numMove];
- objPtr->internalRep.otherValuePtr = cachePtr->firstObjPtr;
+ objPtr->internalRep.twoPtrValue.ptr1 = cachePtr->firstObjPtr;
cachePtr->firstObjPtr = objPtr;
}
}
@@ -549,8 +584,8 @@ TclThreadAllocObj(void)
*/
objPtr = cachePtr->firstObjPtr;
- cachePtr->firstObjPtr = objPtr->internalRep.otherValuePtr;
- --cachePtr->numObjects;
+ cachePtr->firstObjPtr = objPtr->internalRep.twoPtrValue.ptr1;
+ cachePtr->numObjects--;
return objPtr;
}
@@ -578,19 +613,17 @@ void
TclThreadFreeObj(
Tcl_Obj *objPtr)
{
- Cache *cachePtr = TclpGetAllocCache();
+ Cache *cachePtr;
- if (cachePtr == NULL) {
- cachePtr = GetCache();
- }
+ GETCACHE(cachePtr);
/*
* Get this thread's list and push on the free Tcl_Obj.
*/
- objPtr->internalRep.otherValuePtr = cachePtr->firstObjPtr;
+ objPtr->internalRep.twoPtrValue.ptr1 = cachePtr->firstObjPtr;
cachePtr->firstObjPtr = objPtr;
- ++cachePtr->numObjects;
+ cachePtr->numObjects++;
/*
* If the number of free objects has exceeded the high water mark, move
@@ -689,16 +722,16 @@ MoveObjs(
*/
while (--numMove) {
- objPtr = objPtr->internalRep.otherValuePtr;
+ objPtr = objPtr->internalRep.twoPtrValue.ptr1;
}
- fromPtr->firstObjPtr = objPtr->internalRep.otherValuePtr;
+ fromPtr->firstObjPtr = objPtr->internalRep.twoPtrValue.ptr1;
/*
* Move all objects as a block - they are already linked to each other, we
* just have to update the first and last.
*/
- objPtr->internalRep.otherValuePtr = toPtr->firstObjPtr;
+ objPtr->internalRep.twoPtrValue.ptr1 = toPtr->firstObjPtr;
toPtr->firstObjPtr = fromFirstObjPtr;
}
@@ -779,17 +812,9 @@ LockBucket(
Cache *cachePtr,
int bucket)
{
-#if 0
- if (Tcl_MutexTryLock(bucketInfo[bucket].lockPtr) != TCL_OK) {
- Tcl_MutexLock(bucketInfo[bucket].lockPtr);
- ++cachePtr->buckets[bucket].numWaits;
- ++sharedPtr->buckets[bucket].numWaits;
- }
-#else
Tcl_MutexLock(bucketInfo[bucket].lockPtr);
-#endif
- ++cachePtr->buckets[bucket].numLocks;
- ++sharedPtr->buckets[bucket].numLocks;
+ cachePtr->buckets[bucket].numLocks++;
+ sharedPtr->buckets[bucket].numLocks++;
}
static void
@@ -928,7 +953,7 @@ GetBlocks(
size = bucketInfo[n].blockSize;
blockPtr = cachePtr->buckets[n].firstPtr;
cachePtr->buckets[n].firstPtr = blockPtr->nextBlock;
- --cachePtr->buckets[n].numFree;
+ cachePtr->buckets[n].numFree--;
break;
}
}
@@ -998,6 +1023,33 @@ TclFinalizeThreadAlloc(void)
TclpFreeAllocCache(NULL);
}
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclFinalizeThreadAllocThread --
+ *
+ * This procedure is used to destroy single thread private resources used
+ * in this file.
+ * Called in TclpFinalizeThreadData when a thread exits (Tcl_FinalizeThread).
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TclFinalizeThreadAllocThread(void)
+{
+ Cache *cachePtr = TclpGetAllocCache();
+ if (cachePtr != NULL) {
+ TclpFreeAllocCache(cachePtr);
+ }
+}
+
#else /* !(TCL_THREADS && USE_THREAD_ALLOC) */
/*
*----------------------------------------------------------------------
generated by cgit v0.12 at 2025-10-21 20:53:22 (GMT)