Backout failed attempt to fix [32ae34e63a].

2 files changed, 12 insertions, 43 deletions

diff --git a/generic/tclIO.c b/generic/tclIO.c
index d154c77..8e9e346 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -102,30 +102,11 @@ typedef struct CopyState {
     Tcl_WideInt total;		/* Total bytes transferred (written). */
     Tcl_Interp *interp;		/* Interp that started the copy. */
     Tcl_Obj *cmdPtr;		/* Command to be invoked at completion. */
-    int refCount;		/* Claim count on the struct */
-    int bufInUse;		/* Flag to govern access to buffer */
     int bufSize;		/* Size of appended buffer. */
     char buffer[1];		/* Copy buffer, this must be the last
                                  * field. */
 } CopyState;
 
-static void
-PreserveCopyState(
-    CopyState *csPtr)
-{
-    csPtr->refCount++;
-}
-
-static void
-ReleaseCopyState(
-    CopyState *csPtr)
-{
-    if (--csPtr->refCount) {
-	return;
-    }
-    ckfree(csPtr);
-}
-
 /*
  * All static variables used in this file are collected into a single instance
  * of the following structure. For multi-threaded implementations, there is
@@ -9111,13 +9092,9 @@ TclCopyChannel(
 	Tcl_IncrRefCount(cmdPtr);
     }
     csPtr->cmdPtr = cmdPtr;
-    csPtr->refCount = 1;
-    csPtr->bufInUse = 0;
 
     inStatePtr->csPtrR  = csPtr;
-    PreserveCopyState(csPtr);
     outStatePtr->csPtrW = csPtr;
-    PreserveCopyState(csPtr);
 
     if (moveBytes) {
 	return MoveBytes(csPtr);
@@ -9403,11 +9380,6 @@ CopyData(
 				/* Encoding control */
     int underflow;		/* Input underflow */
 
-    if (csPtr->bufInUse) {
-	return TCL_OK;
-    }
-    PreserveCopyState(csPtr);
-
     inChan	= (Tcl_Channel) csPtr->readPtr;
     outChan	= (Tcl_Channel) csPtr->writePtr;
     inStatePtr	= csPtr->readPtr->state;
@@ -9470,7 +9442,6 @@ CopyData(
 		sizeb = (int) csPtr->toRead;
 	    }
 
-	    csPtr->bufInUse = 1;
 	    if (inBinary || sameEncoding) {
 		size = DoRead(inStatePtr->topChanPtr, csPtr->buffer, sizeb,
                               !GotFlag(inStatePtr, CHANNEL_NONBLOCKING));
@@ -9526,7 +9497,6 @@ CopyData(
 		    TclDecrRefCount(bufObj);
 		    bufObj = NULL;
 		}
-		ReleaseCopyState(csPtr);
 		return TCL_OK;
 	    }
 	}
@@ -9547,7 +9517,6 @@ CopyData(
 	} else {
 	    sizeb = WriteChars(outStatePtr->topChanPtr, buffer, sizeb);
 	}
-	csPtr->bufInUse = 0;
 
 	/*
 	 * [Bug 2895565]. At this point 'size' still contains the number of
@@ -9619,7 +9588,6 @@ CopyData(
 		TclDecrRefCount(bufObj);
 		bufObj = NULL;
 	    }
-	    ReleaseCopyState(csPtr);
 	    return TCL_OK;
 	}
 
@@ -9642,7 +9610,6 @@ CopyData(
 		TclDecrRefCount(bufObj);
 		bufObj = NULL;
 	    }
-	    ReleaseCopyState(csPtr);
 	    return TCL_OK;
 	}
     } /* while */
@@ -9658,7 +9625,7 @@ CopyData(
      */
 
     total = csPtr->total;
-    if (cmdPtr && interp && csPtr->cmdPtr) {
+    if (cmdPtr && interp) {
 	int code;
 
 	/*
@@ -9666,7 +9633,8 @@ CopyData(
 	 * arguments. Note that StopCopy frees our saved reference to the
 	 * original command obj.
 	 */
-	cmdPtr = Tcl_DuplicateObj(csPtr->cmdPtr);
+
+	cmdPtr = Tcl_DuplicateObj(cmdPtr);
 	Tcl_IncrRefCount(cmdPtr);
 	StopCopy(csPtr);
 	Tcl_Preserve(interp);
@@ -9694,7 +9662,6 @@ CopyData(
 	    }
 	}
     }
-    ReleaseCopyState(csPtr);
     return result;
 }
 
@@ -10012,16 +9979,10 @@ StopCopy(
 	Tcl_DeleteChannelHandler(inChan, MBEvent, csPtr);
 	Tcl_DeleteChannelHandler(outChan, MBEvent, csPtr);
 	TclDecrRefCount(csPtr->cmdPtr);
-	csPtr->cmdPtr = NULL;
     }
-    if (inStatePtr->csPtrR == NULL) {
-	return;
-    }
-    ReleaseCopyState(inStatePtr->csPtrR);
     inStatePtr->csPtrR = NULL;
-    ReleaseCopyState(outStatePtr->csPtrW);
     outStatePtr->csPtrW = NULL;
-    ReleaseCopyState(csPtr);
+    ckfree(csPtr);
 }
 
 /*
diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c
index a387410..21c766e 100644
--- a/generic/tclIORChan.c
+++ b/generic/tclIORChan.c
@@ -1601,6 +1601,14 @@ ReflectWatch(
 
     mask &= rcPtr->mode;
 
+    if (mask == rcPtr->interest) {
+	/*
+	 * Same old, same old, why should we do something?
+	 */
+
+	return;
+    }
+
     rcPtr->interest = mask;
 
     /*