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-'\"
-'\" Copyright (c) 2006-2008 Joe Mistachkin.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_Cancel 3 8.6 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_CancelEval, Tcl_Canceled \- cancel Tcl scripts
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-int
-\fBTcl_CancelEval\fR(\fIinterp, resultObjPtr, clientData, flags\fR)
-.sp
-int
-\fBTcl_Canceled\fR(\fIinterp, flags\fR)
-.SH ARGUMENTS
-.AS Tcl_Interp *interp
-.AP Tcl_Interp *interp in
-Interpreter in which to cancel the script.
-.AP Tcl_Obj *resultObjPtr in
-Error message to use in the cancellation, or NULL to use a default message. If
-not NULL, this object will have its reference count decremented before
-\fBTcl_CancelEval\fR returns.
-.AP int flags in
-ORed combination of flag bits that specify additional options.
-For \fBTcl_CancelEval\fR, only \fBTCL_CANCEL_UNWIND\fR is currently
-supported.  For \fBTcl_Canceled\fR, only \fBTCL_LEAVE_ERR_MSG\fR and
-\fBTCL_CANCEL_UNWIND\fR are currently supported.
-.AP ClientData clientData in
-Currently reserved for future use.
-It should be set to NULL.
-.BE
-.SH DESCRIPTION
-.PP
-\fBTcl_CancelEval\fR cancels or unwinds the script in progress soon after
-the next invocation of asynchronous handlers, causing \fBTCL_ERROR\fR to be
-the return code for that script.  This function is thread-safe and may be
-called from any thread in the process.
-.PP
-\fBTcl_Canceled\fR checks if the script in progress has been canceled and
-returns \fBTCL_ERROR\fR if it has.  Otherwise, \fBTCL_OK\fR is returned.
-Extensions can use this function to check to see if they should abort a long
-running command.  This function is thread sensitive and may only be called
-from the thread the interpreter was created in.
-.SS "FLAG BITS"
-Any ORed combination of the following values may be used for the
-\fIflags\fR argument to procedures such as \fBTcl_CancelEval\fR:
-.TP 20
-\fBTCL_CANCEL_UNWIND\fR
-.
-This flag is used by \fBTcl_CancelEval\fR and \fBTcl_Canceled\fR.
-For \fBTcl_CancelEval\fR, if this flag is set, the script in progress
-is canceled and the evaluation stack for the interpreter is unwound.
-For \fBTcl_Canceled\fR, if this flag is set, the script in progress
-is considered to be canceled only if the evaluation stack for the
-interpreter is being unwound.
-.TP 20
-\fBTCL_LEAVE_ERR_MSG\fR
-.
-This flag is only used by \fBTcl_Canceled\fR; it is ignored by
-other procedures.  If an error is returned and this bit is set in
-\fIflags\fR, then an error message will be left in the interpreter's
-result, where it can be retrieved with \fBTcl_GetObjResult\fR or
-\fBTcl_GetStringResult\fR.  If this flag bit is not set then no error
-message is left and the interpreter's result will not be modified.
-.SH "SEE ALSO"
-interp(n), Tcl_Eval(3),
-TIP 285
-.SH KEYWORDS
-cancel, unwind