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-rw-r--r--generic/tclIOUtil.c65
1 files changed, 55 insertions, 10 deletions
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c
index c1abc8e..bea1897 100644
--- a/generic/tclIOUtil.c
+++ b/generic/tclIOUtil.c
@@ -28,6 +28,43 @@
#include "tclFileSystem.h"
/*
+ * struct FilesystemRecord --
+ *
+ * A filesystem record is used to keep track of each filesystem currently
+ * registered with the core, in a linked list.
+ */
+
+typedef struct FilesystemRecord {
+ ClientData clientData; /* Client specific data for the new filesystem
+ * (can be NULL) */
+ const Tcl_Filesystem *fsPtr;/* Pointer to filesystem dispatch table. */
+ struct FilesystemRecord *nextPtr;
+ /* The next filesystem registered to Tcl, or
+ * NULL if no more. */
+ struct FilesystemRecord *prevPtr;
+ /* The previous filesystem registered to Tcl,
+ * or NULL if no more. */
+} FilesystemRecord;
+
+/*
+ * This structure holds per-thread private copy of the current directory
+ * maintained by the global cwdPathPtr. This structure holds per-thread
+ * private copies of some global data. This way we avoid most of the
+ * synchronization calls which boosts performance, at cost of having to update
+ * this information each time the corresponding epoch counter changes.
+ */
+
+typedef struct ThreadSpecificData {
+ int initialized;
+ int cwdPathEpoch;
+ int filesystemEpoch;
+ Tcl_Obj *cwdPathPtr;
+ ClientData cwdClientData;
+ FilesystemRecord *filesystemList;
+ int claims;
+} ThreadSpecificData;
+
+/*
* Prototypes for functions defined later in this file.
*/
@@ -195,7 +232,7 @@ static int cwdPathEpoch = 0;
static ClientData cwdClientData = NULL;
TCL_DECLARE_MUTEX(cwdMutex)
-Tcl_ThreadDataKey tclFsDataKey;
+static Tcl_ThreadDataKey fsDataKey;
/*
* One of these structures is used each time we successfully load a file from
@@ -429,7 +466,7 @@ FsThrExitProc(
int
TclFSCwdIsNative(void)
{
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
if (tsdPtr->cwdClientData != NULL) {
return 1;
@@ -463,7 +500,7 @@ int
TclFSCwdPointerEquals(
Tcl_Obj **pathPtrPtr)
{
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
Tcl_MutexLock(&cwdMutex);
if (tsdPtr->cwdPathPtr == NULL
@@ -525,7 +562,7 @@ TclFSCwdPointerEquals(
static void
FsRecacheFilesystemList(void)
{
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
FilesystemRecord *fsRecPtr, *tmpFsRecPtr = NULL, *toFree = NULL, *list;
/*
@@ -589,7 +626,7 @@ FsRecacheFilesystemList(void)
static FilesystemRecord *
FsGetFirstFilesystem(void)
{
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
if (tsdPtr->filesystemList == NULL || ((tsdPtr->claims == 0)
&& (tsdPtr->filesystemEpoch != theFilesystemEpoch))) {
FsRecacheFilesystemList();
@@ -612,16 +649,24 @@ TclFSEpochOk(
static void
Claim()
{
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
tsdPtr->claims++;
}
static void
Disclaim()
{
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
tsdPtr->claims--;
}
+
+int
+TclFSEpoch()
+{
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
+ return tsdPtr->filesystemEpoch;
+}
+
/*
* If non-NULL, clientData is owned by us and must be freed later.
@@ -634,7 +679,7 @@ FsUpdateCwd(
{
int len;
const char *str = NULL;
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
if (cwdObj != NULL) {
str = Tcl_GetStringFromObj(cwdObj, &len);
@@ -2577,7 +2622,7 @@ Tcl_Obj *
Tcl_FSGetCwd(
Tcl_Interp *interp)
{
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
if (TclFSCwdPointerEquals(NULL)) {
FilesystemRecord *fsRecPtr;
@@ -2928,7 +2973,7 @@ Tcl_FSChdir(
* instead. This should be examined by someone on Unix.
*/
- ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
ClientData cd;
ClientData oldcd = tsdPtr->cwdClientData;