From: idgay <idgay>
Date: Thu, 8 Feb 2007 17:49:05 +0000 (+0000)
Subject: arbitrate a parameterised Read interface and forward requests to a single
X-Git-Tag: tinyos/2.0.1~185
X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=commitdiff_plain;h=b470b87e694865bd8f209b78edc48c4ec15cac51;p=tinyos-2.x.git

arbitrate a parameterised Read interface and forward requests to a single
Read interface (contrast with ArbitratedReadC)
---

diff --git a/tos/system/MultiplexedReadC.nc b/tos/system/MultiplexedReadC.nc
new file mode 100644
index 00000000..97a6c8f0
--- /dev/null
+++ b/tos/system/MultiplexedReadC.nc
@@ -0,0 +1,46 @@
+/* $Id$
+ * Copyright (c) 2005 Intel Corporation
+ * All rights reserved.
+ *
+ * This file is distributed under the terms in the attached INTEL-LICENSE     
+ * file. If you do not find these files, copies can be found by writing to
+ * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
+ * 94704.  Attention:  Intel License Inquiry.
+ */
+/**
+ * Multiplex access to a single Read interface for a parameterised
+ * Read interface whose access is controlled by an arbiter.
+ *
+ * @param width_t Width of the underlying Read interface.
+ *
+ * @author David Gay
+ */
+generic module MultiplexedReadC(typedef width_t) {
+  provides interface Read<width_t>[uint8_t client];
+  uses {
+    interface Read<width_t> as Service;
+    interface Resource[uint8_t client];
+  }
+}
+implementation {
+  command error_t Read.read[uint8_t client]() {
+    return call Resource.request[client]();
+  }
+
+  event void Resource.granted[uint8_t client]() {
+    call Service.read();
+  }
+
+  event void Service.readDone(error_t result, width_t data) {
+    uint8_t client = call ArbiterInfo.userId();
+
+    call Resource.release[client]();
+    signal Read.readDone[client](result, data);
+  }
+
+  default async command error_t Resource.request[uint8_t client]() { 
+    return FAIL; 
+  }
+  default async command error_t Resource.release[uint8_t client]() { return FAIL; }
+  default event void Read.readDone[uint8_t client](error_t result, width_t data) { }
+}