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-rw-r--r--generic/tclInterp.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/generic/tclInterp.c b/generic/tclInterp.c
index 6ccde87..bfcc383 100644
--- a/generic/tclInterp.c
+++ b/generic/tclInterp.c
@@ -2096,6 +2096,72 @@ Tcl_GetMaster(
/*
*----------------------------------------------------------------------
*
+ * TclSetSlaveCancelFlags --
+ *
+ * This function marks all slave interpreters belonging to a given
+ * interpreter as being canceled or not canceled, depending on the
+ * provided flags.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TclSetSlaveCancelFlags(
+ Tcl_Interp *interp, /* Set cancel flags of this interpreter. */
+ int flags, /* Collection of OR-ed bits that control
+ * the cancellation of the script. Only
+ * TCL_CANCEL_UNWIND is currently
+ * supported. */
+ int force) /* Non-zero to ignore numLevels for the purpose
+ * of resetting the cancellation flags. */
+{
+ Master *masterPtr; /* Master record of given interpreter. */
+ Tcl_HashEntry *hPtr; /* Search element. */
+ Tcl_HashSearch hashSearch; /* Search variable. */
+ Slave *slavePtr; /* Slave record of interpreter. */
+ Interp *iPtr;
+
+ if (interp == NULL) {
+ return;
+ }
+
+ flags &= (CANCELED | TCL_CANCEL_UNWIND);
+
+ masterPtr = &((InterpInfo *) ((Interp *) interp)->interpInfo)->master;
+
+ hPtr = Tcl_FirstHashEntry(&masterPtr->slaveTable, &hashSearch);
+ for ( ; hPtr != NULL; hPtr = Tcl_NextHashEntry(&hashSearch)) {
+ slavePtr = Tcl_GetHashValue(hPtr);
+ iPtr = (Interp *) slavePtr->slaveInterp;
+
+ if (iPtr == NULL) {
+ continue;
+ }
+
+ if (flags == 0) {
+ TclResetCancellation((Tcl_Interp *) iPtr, force);
+ } else {
+ TclSetCancelFlags(iPtr, flags);
+ }
+
+ /*
+ * Now, recursively handle this for the slaves of this slave
+ * interpreter.
+ */
+
+ TclSetSlaveCancelFlags((Tcl_Interp *) iPtr, flags, force);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
* Tcl_GetInterpPath --
*
* Sets the result of the asking interpreter to a proper Tcl list
@@ -2717,6 +2783,16 @@ SlaveEval(
{
int result;
+ /*
+ * TIP #285: If necessary, reset the cancellation flags for the slave
+ * interpreter now; otherwise, canceling a script in a master interpreter
+ * can result in a situation where a slave interpreter can no longer
+ * evaluate any scripts unless somebody calls the TclResetCancellation
+ * function for that particular Tcl_Interp.
+ */
+
+ TclSetSlaveCancelFlags(slaveInterp, 0, 0);
+
Tcl_Preserve(slaveInterp);
Tcl_AllowExceptions(slaveInterp);