Initial commit

specs/Timer/LICENSE.txt

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+The MIT License
+
+Copyright (c) 2015 P Developers
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

specs/Timer/PSrc/Timer.p

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+/*****************************************************************************************
+The timer state machine models the non-deterministic behavior of an OS timer
+******************************************************************************************/
+machine Timer
+{
+    // user of the timer
+  var client: machine;
+  start state Init {
+    entry (_client : machine){
+      client = _client;
+      goto WaitForTimerRequests;
+    }
+  }
+
+  state WaitForTimerRequests {
+    on eStartTimer goto TimerStarted;
+    ignore eCancelTimer, eDelayedTimeOut;
+  }
+
+  state TimerStarted {
+    defer eStartTimer;
+    entry {
+      if($)
+      {
+        send client, eTimeOut;
+        goto WaitForTimerRequests;
+      }
+      else
+      {
+        send this, eDelayedTimeOut;
+      }
+    }
+    on eDelayedTimeOut goto TimerStarted;
+    on eCancelTimer goto WaitForTimerRequests;
+  }
+}
+
+/************************************************
+Events used to interact with the timer machine
+************************************************/
+event eStartTimer;
+event eCancelTimer;
+event eTimeOut;
+event eDelayedTimeOut;
+/************************************************
+Functions or API's to interact with the OS Timer
+*************************************************/
+// create timer
+fun CreateTimer(client: machine) : Timer
+{
+  return new Timer(client);
+}
+
+// start timer
+fun StartTimer(timer: Timer)
+{
+  send timer, eStartTimer;
+}
+
+// cancel timer
+fun CancelTimer(timer: Timer)
+{
+  send timer, eCancelTimer;
+}

specs/Timer/PSrc/TimerModules.p

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+/* Create the timer module which consists of only the timer machine */
+module Timer = { Timer };

specs/Timer/README.md

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+# Timer
+
+This project includes modified portions of the following open-source project:
+
+- [**P**](https://github.com/p-org/P) Licensed under the [MIT License](LICENSE.txt).
+  - Source: the original implementation of [`Timer`](https://github.com/p-org/P/tree/master/Tutorial/Common/Timer).

specs/Timer/Timer.pproj

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+<!-- P Project file for the Timer Module-->
+<Project>
+<ProjectName>Timer</ProjectName>
+<InputFiles>
+	<PFile>./PSrc/</PFile>
+</InputFiles>
+<OutputDir>./PGenerated/</OutputDir>
+</Project>