diff --git a/collects/racket/place.rkt b/collects/racket/place.rkt
index eedaa88b9c..89f751d47c 100644
--- a/collects/racket/place.rkt
+++ b/collects/racket/place.rkt
@@ -59,6 +59,7 @@
 (define (th-place-sleep n) (sleep n))
 (define (th-place-wait pl) (thread-wait (TH-place-th pl)) 0)
 (define (th-place-kill pl) (custodian-shutdown-all (TH-place-cust pl)))
+(define (th-place-break pl) (break-thread (TH-place-th pl)))
 (define (th-place-channel)
   (define-values (as ar) (make-th-async-channel))
   (define-values (bs br) (make-th-async-channel))
@@ -117,6 +118,7 @@
 (define-pl place-sleep        pl-place-sleep        th-place-sleep)
 (define-pl place-wait         pl-place-wait         th-place-wait)
 (define-pl place-kill         pl-place-kill         th-place-kill)
+(define-pl place-break        pl-place-break        th-place-break)
 (define-pl place-channel      pl-place-channel      th-place-channel)
 (define-pl place-channel-send pl-place-channel-send th-place-channel-send)
 (define-pl place-channel-receive pl-place-channel-receive th-place-channel-receive)
diff --git a/collects/scribblings/reference/places.scrbl b/collects/scribblings/reference/places.scrbl
index e39645ffd7..953593b553 100644
--- a/collects/scribblings/reference/places.scrbl
+++ b/collects/scribblings/reference/places.scrbl
@@ -119,6 +119,13 @@ racket
   blocking until the place completes if it has not already completed.
 }
 
+@defproc[(place-break [p place?]) void?]{
+  Sends place @racket[p] a break signal; see @secref["breakhandler"].
+}
+
+@defproc[(place-kill [p place?]) void?]{
+  Terminates the place indicated by @racket[p],
+}
 
 @defproc[(place-channel) (values place-channel? place-channel?)]{
 
diff --git a/collects/setup/parallel-do.rkt b/collects/setup/parallel-do.rkt
index 2716c2affe..86f01fde16 100644
--- a/collects/setup/parallel-do.rkt
+++ b/collects/setup/parallel-do.rkt
@@ -82,14 +82,14 @@
   (define/public (send/msg msg) 
     (with-handlers ([exn:fail?
       (lambda (x)
-          (eprintf "CONTROLLER SEND MESSAGE ERROR TO WORKER ~a ~a\n" id (exn-message x))
+          (eprintf "While sending message to parallel-do worker: ~a ~a\n" id (exn-message x))
           (exit 1))])
     (DEBUG_COMM (eprintf "CSENDING ~v ~v\n" id msg))
     (write msg in) (flush-output in)))
   (define/public (recv/msg)
     (with-handlers ([exn:fail?
       (lambda (x)
-          (eprintf "CONTROLLER RECEIVE MESSAGE ERROR FROM WORKER ~a ~a\n" id (exn-message x))
+          (eprintf "While receiving message from parallel-do worker ~a ~a\n" id (exn-message x))
           (exit 1))])
     (define r (read out))
     (DEBUG_COMM (eprintf "CRECEIVNG ~v ~v\n" id r))
@@ -177,6 +177,7 @@
   (define (jobs?) (queue/has jobqueue))
   (define (empty?) (not (queue/has jobqueue)))
   (define workers #f)
+  (define no-breaks #f)
   (dynamic-wind
     (lambda ()
       (parameterize-break #f
@@ -206,7 +207,7 @@
                             [error-count error-count]) 
              (error-threshold error-count)
              (with-handlers* ([exn:fail? (lambda (e) 
-                     (printf "MASTER WRITE ERROR - writing to worker: ~v ~a\n" (wrkr/id wrkr) (exn-message e))    
+                     (printf "Error writing to worker: ~v ~a\n" (wrkr/id wrkr) (exn-message e))    
                      (wrkr/kill wrkr)
                      (retry-loop (spawn (wrkr/id wrkr)) (add1 error-count)))])
                 (wrkr/send wrkr cmd-list))
@@ -224,7 +225,7 @@
                 [(list node wrkr)
                   (handle-evt (wrkr/out wrkr) (λ (e)
                     (with-handlers* ([exn:fail? (lambda (e) 
-                                    (printf "MASTER READ ERROR - reading from worker: ~v ~a\n" (wrkr/id wrkr) (exn-message e))
+                                    (printf "Error reading from worker: ~v ~a\n" (wrkr/id wrkr) (exn-message e))
                                     (kill/remove-dead-worker node-worker wrkr))])
                       (let ([msg (if use-places e (wrkr/recv wrkr))])
                         (if (pair? msg)
@@ -238,7 +239,9 @@
                   (eprintf "parallel-do-event-loop match node-worker failed.\n")
                   (eprintf "trying to match:\n~a\n" node-worker)]))
             (DEBUG_COMM (printf "WAITING ON WORKERS TO RESPOND\n"))
-            (apply sync (map gen-node-handler inflight))])))
+            (begin0 
+              (apply sync (map gen-node-handler inflight))
+              (set! no-breaks #t))])))
     (lambda () 
       ;(printf "Asking all workers to die\n")
       (for ([p workers]) (with-handlers ([exn:fail? void]) (wrkr/send p (list 'DIE))))
diff --git a/src/racket/src/places.c b/src/racket/src/places.c
index 692183aaac..60c6a9ebe1 100644
--- a/src/racket/src/places.c
+++ b/src/racket/src/places.c
@@ -24,6 +24,7 @@ THREAD_LOCAL_DECL(void *place_object);
 static Scheme_Object *scheme_place(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_wait(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_kill(int argc, Scheme_Object *args[]);
+static Scheme_Object *scheme_place_break(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_sleep(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_p(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_send(int argc, Scheme_Object *args[]);
@@ -92,6 +93,7 @@ void scheme_init_place(Scheme_Env *env)
   PLACE_PRIM_W_ARITY("place-sleep",           scheme_place_sleep,     1, 1, plenv);
   PLACE_PRIM_W_ARITY("place-wait",            scheme_place_wait,      1, 1, plenv);
   PLACE_PRIM_W_ARITY("place-kill",            scheme_place_kill,      1, 1, plenv);
+  PLACE_PRIM_W_ARITY("place-break",           scheme_place_break,     1, 1, plenv);
   PLACE_PRIM_W_ARITY("place?",                scheme_place_p,         1, 1, plenv);
   PLACE_PRIM_W_ARITY("place-channel",         scheme_place_channel,   0, 0, plenv);
   PLACE_PRIM_W_ARITY("place-channel-send",    scheme_place_send,      1, 2, plenv);
@@ -176,7 +178,9 @@ Scheme_Object *scheme_place_sleep(int argc, Scheme_Object *args[]) {
  * it is shared acrosss place boundaries and 
  * must be allocated with malloc and free*/
 typedef struct Scheme_Place_Object {
-  int die;
+  mzrt_mutex *lock;
+  char die;
+  char pbreak;
   mz_jmp_buf *exit_buf;
   void *signal_handle;
   /*Thread_Local_Variables *tlvs; */
@@ -194,8 +198,10 @@ Scheme_Object *scheme_place(int argc, Scheme_Object *args[]) {
   place = MALLOC_ONE_TAGGED(Scheme_Place);
   place->so.type = scheme_place_type;
   place_obj = malloc(sizeof(Scheme_Place_Object));
+  mzrt_mutex_create(&place_obj->lock);
   place->place_obj = place_obj;
   place_obj->die = 0;
+  place_obj->pbreak = 0;
 
   mzrt_sema_create(&ready, 0);
 
@@ -266,12 +272,36 @@ Scheme_Object *scheme_place(int argc, Scheme_Object *args[]) {
 static int place_kill(Scheme_Place *place) {
   Scheme_Place_Object *place_obj;
   place_obj = (Scheme_Place_Object*) place->place_obj;
-  place_obj->die = 1;
+
+  {
+    mzrt_mutex_lock(place_obj->lock);
+
+    place_obj->die = 1;
+
+    mzrt_mutex_unlock(place_obj->lock);
+  }
+
   scheme_signal_received_at(place_obj->signal_handle);
   scheme_remove_managed(place->mref, (Scheme_Object *)place);
   return 0;
 }
 
+static int place_break(Scheme_Place *place) {
+  Scheme_Place_Object *place_obj;
+  place_obj = (Scheme_Place_Object*) place->place_obj;
+
+  {
+    mzrt_mutex_lock(place_obj->lock);
+
+    place_obj->pbreak = 1;
+
+    mzrt_mutex_unlock(place_obj->lock);
+  }
+
+  scheme_signal_received_at(place_obj->signal_handle);
+  return 0;
+}
+
 static int cust_kill_place(Scheme_Object *pl, void *notused) {
   return place_kill((Scheme_Place *)pl);
 }
@@ -289,6 +319,19 @@ static Scheme_Object *scheme_place_kill(int argc, Scheme_Object *args[]) {
   return scheme_make_integer(place_kill(place));
 }
 
+static Scheme_Object *scheme_place_break(int argc, Scheme_Object *args[]) {
+  Scheme_Place          *place;
+  place = (Scheme_Place *) args[0];
+
+  if (argc != 1) {
+    scheme_wrong_count_m("place-break", 1, 1, argc, args, 0);
+  }
+  if (!SAME_TYPE(SCHEME_TYPE(args[0]), scheme_place_type)) {
+    scheme_wrong_type("place-break", "place", 0, argc, args);
+  }
+  return scheme_make_integer(place_break(place));
+}
+
 
 # if defined(MZ_PLACES_WAITPID)
 /*============= SIGCHLD SIGNAL HANDLING =============*/
@@ -1115,11 +1158,27 @@ static void *place_start_proc(void *data_arg) {
   return rc;
 }
 
-void scheme_place_check_for_killed() {
+void scheme_place_check_for_interruption() {
   Scheme_Place_Object *place_obj;
+  char local_die;
+  char local_break;
+
   place_obj = (Scheme_Place_Object *) place_object;
-  if (place_obj && place_obj->die) {
-    scheme_longjmp(*place_obj->exit_buf, 1);
+  if (place_obj) {
+    {
+      mzrt_mutex_lock(place_obj->lock);
+
+      local_die = place_obj->die;
+      local_break = place_obj->pbreak;
+      place_obj->pbreak = 0;
+
+      mzrt_mutex_unlock(place_obj->lock);
+    }
+
+    if (local_die)
+      scheme_longjmp(*place_obj->exit_buf, 1);
+    if (local_break)
+      scheme_break_thread(NULL);
   }
 }
   
diff --git a/src/racket/src/schpriv.h b/src/racket/src/schpriv.h
index c43b7b275b..3dc8dfe883 100644
--- a/src/racket/src/schpriv.h
+++ b/src/racket/src/schpriv.h
@@ -3672,7 +3672,7 @@ typedef struct Scheme_Place {
 Scheme_Env *scheme_place_instance_init();
 void scheme_place_instance_destroy();
 void scheme_kill_green_thread_timer();
-void scheme_place_check_for_killed();
+void scheme_place_check_for_interruption();
 /*========================================================================*/
 /*                           engine                                       */
 /*========================================================================*/
diff --git a/src/racket/src/thread.c b/src/racket/src/thread.c
index 17a28b6370..3c3371d4dd 100644
--- a/src/racket/src/thread.c
+++ b/src/racket/src/thread.c
@@ -4164,7 +4164,7 @@ void scheme_thread_block(float sleep_time)
 #endif
 #if defined(MZ_USE_PLACES)
   if (!do_atomic)
-    scheme_place_check_for_killed();
+    scheme_place_check_for_interruption();
 #endif
   
   if (sleep_end > 0) {