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-rw-r--r--generic/tclIOUtil.c123
1 files changed, 62 insertions, 61 deletions
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c
index 3bdcca3..b1b8961 100644
--- a/generic/tclIOUtil.c
+++ b/generic/tclIOUtil.c
@@ -39,9 +39,10 @@ static void FsAddMountsToGlobResult(Tcl_Obj *resultPtr,
Tcl_GlobTypeData *types);
static void FsUpdateCwd(Tcl_Obj *cwdObj, ClientData clientData);
-#ifdef TCL_THREADS
static void FsRecacheFilesystemList(void);
-#endif
+static void Claim(void);
+static void Disclaim(void);
+
/*
* These form part of the native filesystem support. They are needed here
@@ -398,7 +399,6 @@ Tcl_Filesystem tclNativeFilesystem = {
static FilesystemRecord nativeFilesystemRecord = {
NULL,
&tclNativeFilesystem,
- 1,
NULL,
NULL
};
@@ -410,7 +410,7 @@ static FilesystemRecord nativeFilesystemRecord = {
* trigger cache cleanup in all threads.
*/
-static int theFilesystemEpoch = 0;
+static int theFilesystemEpoch = 1;
/*
* Stores the linked list of filesystems. A 1:1 copy of this list is also
@@ -479,9 +479,8 @@ FsThrExitProc(
fsRecPtr = tsdPtr->filesystemList;
while (fsRecPtr != NULL) {
tmpFsRecPtr = fsRecPtr->nextPtr;
- if (--fsRecPtr->fileRefCount <= 0) {
- ckfree((char *)fsRecPtr);
- }
+ fsRecPtr->fsPtr = NULL;
+ ckfree((char *)fsRecPtr);
fsRecPtr = tmpFsRecPtr;
}
tsdPtr->initialized = 0;
@@ -583,12 +582,11 @@ TclFSCwdPointerEquals(
}
}
-#ifdef TCL_THREADS
static void
FsRecacheFilesystemList(void)
{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
- FilesystemRecord *fsRecPtr, *tmpFsRecPtr = NULL;
+ FilesystemRecord *fsRecPtr, *tmpFsRecPtr = NULL, *toFree = NULL, *list;
/*
* Trash the current cache.
@@ -597,20 +595,16 @@ FsRecacheFilesystemList(void)
fsRecPtr = tsdPtr->filesystemList;
while (fsRecPtr != NULL) {
tmpFsRecPtr = fsRecPtr->nextPtr;
- if (--fsRecPtr->fileRefCount <= 0) {
- ckfree((char *)fsRecPtr);
- }
+ fsRecPtr->nextPtr = toFree;
+ toFree = fsRecPtr;
fsRecPtr = tmpFsRecPtr;
}
- tsdPtr->filesystemList = NULL;
/*
- * Code below operates on shared data. We are already called under mutex
- * lock so we can safely proceed.
- *
* Locate tail of the global filesystem list.
*/
+ Tcl_MutexLock(&filesystemMutex);
fsRecPtr = filesystemList;
while (fsRecPtr != NULL) {
tmpFsRecPtr = fsRecPtr;
@@ -621,18 +615,26 @@ FsRecacheFilesystemList(void)
* Refill the cache honouring the order.
*/
+ list = NULL;
fsRecPtr = tmpFsRecPtr;
while (fsRecPtr != NULL) {
tmpFsRecPtr = (FilesystemRecord *) ckalloc(sizeof(FilesystemRecord));
*tmpFsRecPtr = *fsRecPtr;
- tmpFsRecPtr->nextPtr = tsdPtr->filesystemList;
+ tmpFsRecPtr->nextPtr = list;
tmpFsRecPtr->prevPtr = NULL;
- if (tsdPtr->filesystemList) {
- tsdPtr->filesystemList->prevPtr = tmpFsRecPtr;
- }
- tsdPtr->filesystemList = tmpFsRecPtr;
+ list = tmpFsRecPtr;
fsRecPtr = fsRecPtr->prevPtr;
}
+ tsdPtr->filesystemList = list;
+ tsdPtr->filesystemEpoch = theFilesystemEpoch;
+ Tcl_MutexUnlock(&filesystemMutex);
+
+ while (toFree) {
+ FilesystemRecord *next = toFree->nextPtr;
+ toFree->fsPtr = NULL;
+ ckfree((char *)toFree);
+ toFree = next;
+ }
/*
* Make sure the above gets released on thread exit.
@@ -643,27 +645,16 @@ FsRecacheFilesystemList(void)
tsdPtr->initialized = 1;
}
}
-#endif /* TCL_THREADS */
static FilesystemRecord *
FsGetFirstFilesystem(void)
{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
- FilesystemRecord *fsRecPtr;
-#ifndef TCL_THREADS
- tsdPtr->filesystemEpoch = theFilesystemEpoch;
- fsRecPtr = filesystemList;
-#else
- Tcl_MutexLock(&filesystemMutex);
- if (tsdPtr->filesystemList == NULL
- || (tsdPtr->filesystemEpoch != theFilesystemEpoch)) {
+ if (tsdPtr->filesystemList == NULL || ((tsdPtr->claims == 0)
+ && (tsdPtr->filesystemEpoch != theFilesystemEpoch))) {
FsRecacheFilesystemList();
- tsdPtr->filesystemEpoch = theFilesystemEpoch;
}
- Tcl_MutexUnlock(&filesystemMutex);
- fsRecPtr = tsdPtr->filesystemList;
-#endif
- return fsRecPtr;
+ return tsdPtr->filesystemList;
}
/*
@@ -675,9 +666,21 @@ int
TclFSEpochOk(
int filesystemEpoch)
{
+ return (filesystemEpoch == 0 || filesystemEpoch == theFilesystemEpoch);
+}
+
+static void
+Claim()
+{
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ tsdPtr->claims++;
+}
+
+static void
+Disclaim()
+{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
- (void) FsGetFirstFilesystem();
- return (filesystemEpoch == tsdPtr->filesystemEpoch);
+ tsdPtr->claims--;
}
/*
@@ -787,17 +790,15 @@ TclFinalizeFilesystem(void)
fsRecPtr = filesystemList;
while (fsRecPtr != NULL) {
FilesystemRecord *tmpFsRecPtr = fsRecPtr->nextPtr;
- if (fsRecPtr->fileRefCount <= 0) {
- /*
- * The native filesystem is static, so we don't free it.
- */
- if (fsRecPtr->fsPtr != &tclNativeFilesystem) {
- ckfree((char *)fsRecPtr);
- }
+ /* The native filesystem is static, so we don't free it. */
+
+ if (fsRecPtr != &nativeFilesystemRecord) {
+ ckfree((char *)fsRecPtr);
}
fsRecPtr = tmpFsRecPtr;
}
+ theFilesystemEpoch++;
filesystemList = NULL;
/*
@@ -835,11 +836,7 @@ void
TclResetFilesystem(void)
{
filesystemList = &nativeFilesystemRecord;
-
- /*
- * Note, at this point, I believe nativeFilesystemRecord -> fileRefCount
- * should equal 1 and if not, we should try to track down the cause.
- */
+ theFilesystemEpoch++;
#ifdef __WIN32__
/*
@@ -898,13 +895,6 @@ Tcl_FSRegister(
newFilesystemPtr->fsPtr = fsPtr;
/*
- * We start with a refCount of 1. If this drops to zero, then anyone is
- * welcome to ckfree us.
- */
-
- newFilesystemPtr->fileRefCount = 1;
-
- /*
* Is this lock and wait strictly speaking necessary? Since any iterators
* out there will have grabbed a copy of the head of the list and be
* iterating away from that, if we add a new element to the head of the
@@ -977,7 +967,7 @@ Tcl_FSUnregister(
*/
fsRecPtr = filesystemList;
- while ((retVal == TCL_ERROR) && (fsRecPtr->fsPtr != &tclNativeFilesystem)) {
+ while ((retVal == TCL_ERROR) && (fsRecPtr != &nativeFilesystemRecord)) {
if (fsRecPtr->fsPtr == fsPtr) {
if (fsRecPtr->prevPtr) {
fsRecPtr->prevPtr->nextPtr = fsRecPtr->nextPtr;
@@ -998,10 +988,7 @@ Tcl_FSUnregister(
theFilesystemEpoch++;
- fsRecPtr->fileRefCount--;
- if (fsRecPtr->fileRefCount <= 0) {
- ckfree((char *)fsRecPtr);
- }
+ ckfree((char *)fsRecPtr);
retVal = TCL_OK;
} else {
@@ -1422,6 +1409,7 @@ TclFSNormalizeToUniquePath(
firstFsRecPtr = FsGetFirstFilesystem();
+ Claim();
fsRecPtr = firstFsRecPtr;
while (fsRecPtr != NULL) {
if (fsRecPtr->fsPtr == &tclNativeFilesystem) {
@@ -1454,6 +1442,7 @@ TclFSNormalizeToUniquePath(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return startAt;
}
@@ -2648,6 +2637,7 @@ Tcl_FSGetCwd(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while ((retVal == NULL) && (fsRecPtr != NULL)) {
Tcl_FSGetCwdProc *proc = fsRecPtr->fsPtr->getCwdProc;
if (proc != NULL) {
@@ -2685,6 +2675,7 @@ Tcl_FSGetCwd(
}
Tcl_DecrRefCount(retVal);
retVal = NULL;
+ Disclaim();
goto cdDidNotChange;
} else if (interp != NULL) {
Tcl_AppendResult(interp,
@@ -2697,6 +2688,7 @@ Tcl_FSGetCwd(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
/*
* Now the 'cwd' may NOT be normalized, at least on some platforms.
@@ -3642,6 +3634,7 @@ Tcl_FSListVolumes(void)
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while (fsRecPtr != NULL) {
Tcl_FSListVolumesProc *proc = fsRecPtr->fsPtr->listVolumesProc;
if (proc != NULL) {
@@ -3653,6 +3646,7 @@ Tcl_FSListVolumes(void)
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return resultPtr;
}
@@ -3692,6 +3686,7 @@ FsListMounts(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while (fsRecPtr != NULL) {
if (fsRecPtr->fsPtr != &tclNativeFilesystem) {
Tcl_FSMatchInDirectoryProc *proc =
@@ -3705,6 +3700,7 @@ FsListMounts(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return resultPtr;
}
@@ -3917,6 +3913,7 @@ TclFSNonnativePathType(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while (fsRecPtr != NULL) {
Tcl_FSListVolumesProc *proc = fsRecPtr->fsPtr->listVolumesProc;
@@ -3995,6 +3992,7 @@ TclFSNonnativePathType(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return type;
}
@@ -4389,8 +4387,10 @@ Tcl_FSGetFileSystemForPath(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
if (TclFSEnsureEpochOk(pathPtr, &retVal) != TCL_OK) {
+ Disclaim();
return NULL;
}
@@ -4417,6 +4417,7 @@ Tcl_FSGetFileSystemForPath(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return retVal;
}
generated by cgit v0.12 at 2024-11-25 03:29:07 (GMT)