diff -r ff95708d4427 Modules/_tkinter.c
--- a/Modules/_tkinter.c	Tue Jun 02 11:38:01 2015 -0400
+++ b/Modules/_tkinter.c	Thu Jun 04 21:29:32 2015 +0900
@@ -24,6 +24,7 @@
 
 #include "Python.h"
 #include <ctype.h>
+#include <signal.h>
 
 #ifdef WITH_THREAD
 #include "pythread.h"
@@ -3527,12 +3528,29 @@
 static PyThreadState *event_tstate = NULL;
 #endif
 
+static Tcl_AsyncHandler handler;
+
+static void sigint_handler(int signum)
+{
+    Tcl_AsyncMark(handler);
+}
+
+static int
+interrupt_handler(ClientData clientData, Tcl_Interp *interp, int code)
+{
+    int* flag = (int*)clientData;
+    *flag = 1;
+    return code;
+}
+
 static int
 EventHook(void)
 {
 #ifndef MS_WINDOWS
     int tfile;
 #endif
+    int interrupted = 0;
+    PyOS_sighandler_t py_sigint_handler;
 #ifdef WITH_THREAD
     PyEval_RestoreThread(event_tstate);
 #endif
@@ -3542,6 +3560,8 @@
     tfile = fileno(stdin);
     Tcl_CreateFileHandler(tfile, TCL_READABLE, MyFileProc, NULL);
 #endif
+    py_sigint_handler = PyOS_setsig(SIGINT, sigint_handler);
+    handler = Tcl_AsyncCreate(interrupt_handler, (ClientData)&interrupted);
     while (!errorInCmd && !stdin_ready) {
         int result;
 #ifdef MS_WINDOWS
@@ -3565,10 +3585,13 @@
 #else
         result = Tcl_DoOneEvent(0);
 #endif
+        if (interrupted) break;
 
         if (result < 0)
             break;
     }
+    PyOS_setsig(SIGINT, py_sigint_handler);
+    Tcl_AsyncDelete(handler);
 #ifndef MS_WINDOWS
     Tcl_DeleteFileHandler(tfile);
 #endif
@@ -3581,6 +3604,11 @@
 #ifdef WITH_THREAD
     PyEval_SaveThread();
 #endif
+    if (interrupted) {
+        raise(SIGINT);
+        errno = EINTR;
+        return -1;
+    }
     return 0;
 }