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diff --git a/tos/lib/tosthreads/lib/net/ctp/BlockingCollectionSenderImplP.nc b/tos/lib/tosthreads/lib/net/ctp/BlockingCollectionSenderImplP.nc
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+/*
+ * Copyright (c) 2008 Johns Hopkins University.
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written
+ * agreement is hereby granted, provided that the above copyright
+ * notice, the (updated) modification history and the author appear in
+ * all copies of this source code.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF USE, DATA,
+ * OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*
+ * @author Chieh-Jan Mike Liang <cliang4@cs.jhu.edu>
+ */
+ 
+module BlockingCollectionSenderImplP {
+  provides {
+    interface BlockingSend[uint8_t client];
+    interface Init;
+  }
+  
+  uses {
+    interface Send[uint8_t client];
+    interface SystemCall;
+    interface Mutex;
+    interface Packet;
+    interface Leds;
+  }
+}
+
+implementation {
+  typedef struct params {
+    message_t *msg;
+    uint8_t len;
+    error_t error;
+  } params_t;
+  
+  syscall_t* send_call;
+  mutex_t my_mutex;
+  
+  command error_t Init.init()
+  {
+    call Mutex.init(&my_mutex);
+    return SUCCESS;
+  }
+
+  void sendTask(syscall_t *s)
+  {
+    params_t* p = s->params;
+    
+    p->error = call Send.send[s->id](p->msg, p->len);
+    if(p->error != SUCCESS) {
+      call SystemCall.finish(s);
+    }
+  }
+
+  command error_t BlockingSend.send[uint8_t client](message_t *msg, uint8_t len)
+  {
+    syscall_t s;
+    params_t p;
+    call Mutex.lock(&my_mutex);
+    send_call = &s;
+    
+    p.msg = msg;
+    p.len = len;
+    
+    call SystemCall.start(&sendTask, &s, client, &p);
+    
+    atomic {
+      call Mutex.unlock(&my_mutex);
+      return p.error;
+    }
+  }
+  
+  event void Send.sendDone[uint8_t client](message_t* m, error_t error)
+  {
+    if (client == send_call->id) {
+      params_t* p;
+      
+      p = send_call->params;
+      p->error = error;
+      call SystemCall.finish(send_call);
+    }
+  }
+  
+  command error_t BlockingSend.cancel[uint8_t client](message_t* msg)
+  {
+    return call Send.cancel[client](msg);
+  }
+  
+  command uint8_t BlockingSend.maxPayloadLength[uint8_t client]()
+  {
+    return call Send.maxPayloadLength[client]();
+  }
+  
+  command void* BlockingSend.getPayload[uint8_t client](message_t* msg, uint8_t len)
+  {
+    return call Send.getPayload[client](msg, len);
+  }
+}