Difference between pages "Tasking Event-B Overview" and "Theory Release History"

From Event-B
(Difference between pages)
Jump to navigationJump to search
imported>Andy
 
 
Line 1: Line 1:
−
=== Tasking Event-B ===
+
Back to [[Theory Plug-in]].
−
Tasking Event-B can be viewed as an extension of the existing Event-B language. We use the existing approaches of refinement and decomposition to structure a project that is suitable for a Tasking Development. During the modelling phase parameters are introduced to facilitate decomposition. As a result of the decomposition process, parameters become part of the interface that enables event synchronization. We make use of this interface and add information (see [[#Implementing Events]]) to facilitate code generation. The tasking extension consists of the constructs in the following table.
 
  
−
<center>
+
Follow this page for the latest on the Theory plug-in. The user manual is also provided together with the installation details.
−
{| border="1"
 
−
!Construct
 
−
!Options
 
−
|-
 
−
|Machine Type
 
−
|DeclaredTask, [http://wiki.event-b.org/index.php/Tasking_Event-B_Overview#Tasking_Machines AutoTask], [http://wiki.event-b.org/index.php/Tasking_Event-B_Overview#Shared_Machines SharedMachine], [http://wiki.event-b.org/index.php/Tasking_Event-B_Overview#The_Environ_Machine Environ]
 
−
|-
 
−
|[http://wiki.event-b.org/index.php/Tasking_Event-B_Overview#Control_Constructs Control]
 
−
|Sequence, Loop, Branch, Event, Output
 
−
|-
 
−
|[http://wiki.event-b.org/index.php/Tasking_Event-B_Overview#Tasking_Machines Task Type]
 
−
|Periodic(n), Triggered, Repeating, OneShot
 
−
|-
 
−
|Priority
 
−
| -
 
−
|-
 
−
|[http://wiki.event-b.org/index.php/Tasking_Event-B_Overview#Implementing_Events Event Role]
 
−
| Actuating, Sensing
 
−
|-
 
−
|[http://wiki.event-b.org/index.php/Tasking_Event-B_Overview#Addressed_Variables Addressed Variable]
 
−
|Address, Base
 
−
|}
 
−
</center>
 
  
−
==== Tasking Machines ====
+
===News===
−
The following constructs relate to Tasking and Environ Machines, and provide implementation details. Timing of periodic tasks is not modelled formally. Tasking and Environ Machines model Ada tasks, so they can be implemented easily in Ada; in C using the pthread library, or in Java using threads.
+
* ''22th December 2020'': [[#Version_4.0.1|Version 4.0.1]] is released. It requires Rodin 3.5.
 +
* ''19th December 2014'': [[#Version_3.0.0|Version 3.0.o]] is released. It requires Rodin 3.1.
 +
* ''10th July 2014'': [[#Version_2.0.2|Version 2.0.2]] is released. It requires Rodin 2.8.
 +
* ''24th June 2014'': [[#Version_2.0.1|Version 2.0.1]] is released. It requires Rodin 2.8.
 +
* ''30th April 2014'': [[#Version_2.0.0|Version 2.0.0]] is released. It requires Rodin 2.8. This release contains major changes in the features and accessibilities.
 +
* ''20th April 2012'': [[#Version_1.3.2|Version 1.3.2]] is released. It requires Rodin 2.4.
 +
* ''15th August 2011'': [[#Version_1.2|Version 1.2]] is released. It requires Rodin 2.2.2.
 +
* ''6th August 2011'': [[#Version_1.1|Version 1.1]] is released. It requires Rodin 2.2.2.
 +
* ''8th July 2011'': [[#Version_1.0|Version 1.0]] is released. It requires Rodin 2.2.
 +
* ''22nd May 2011'': [[#Version_0.8|Version 0.8]] released. It is based on Rodin 2.1.1.
 +
* ''11th April 2011'': [[#Version_0.7|Version 0.7]] released. It is based on Rodin 2.1.1.
 +
* ''6th January 2011'': [[#Version_0.6|Version 0.6]] released. It is based on Rodin 2.0.1.
 +
* ''28th October 2010'': [[#Version_0.5|Version 0.5]] released. It is based on Rodin 2.0.
  
−
* Tasking Machines may be one of the following types:
+
===Releases===
−
** AutoTasks - Anonymous Tasks running from start-up.
+
===== Version 4.0.1 =====
−
** Declared tasks - (Not currently used) A task template relating to an Ada ''tasktype'' declaration.
+
''22th December 2020''
  
−
''Auto Tasks'' are tasks that will be declared and defined in the ''Main'' procedure of the implementation. The effect of this is that the ''Auto Tasks'' are created when the program first loads, and then activated (made ready to run) before the ''Main'' procedure body runs.
+
Release target: Rodin 3.5
 +
* Bug fixes:
 +
** The theory plugin now takes into account updates in theories, as well as creating a theory after using it (there was a cache issue).
 +
** The error messages at launch about rule-based provers failing to find the context of the proof have been removed.
 +
** The dropdown list in theory imports is now usable (there was an off-by-one issue when selecting an element in the list).
 +
** Manually applying an inference rule no longer throws a NullPointerException.
 +
** It is now possible to rename theories.
 +
** The TheoryPath creation dialog box has been simplified.
 +
* Optimizations:
 +
** The proving interface is now much more responsive, even when a theory contains a lot of rewrite rules (we have implemented a cache of the places where a rewrite rule can apply).
 +
** The theory plugin now generates much simpler WD conditions, especially for the pred, succ, prj1, prj2, and id operators.
  
−
* Tasking and Environ Machines options are:
+
===== Version 4.0.0-RC1 =====
−
** TaskType - Defines the scheduling, cycle and lifetime of a task. i.e. one-shot periodic or triggered. The period of a task is specified in milliseconds.
+
''10th April 2017''
−
** Priority - An integer value is supplied, the task with the highest value priority takes precedence when being scheduled. The default priority is 5.
 
  
−
==== Shared Machines ====
+
Release target: Rodin 3.2
−
A Shared Machine models a protected resource, such as a monitor. It may be implemented in Ada as a Protected Object, in C using mutex locking, or in Java as a monitor.
+
* AST Extensions (4.0.0) Major API change.
 +
** Compatibility upgrade to Rodin 3.2
 +
** Support for get operator position for INFIX extended predicate operators.
 +
** Improve pattern matching for associative operators.
 +
* Theory plug-in Branding (0.0.1) Initial version
 +
* Theory Core (4.0.0) Internal implementation changes.
 +
** Compatibility upgrade to Rodin 3.2
 +
** Support for INFIX extended predicate operators.
 +
** Various bugs fixed.
 +
* Theory help (2.0.0) User documentations.
 +
* Theory Keyboard (0.0.1) Initial version (A special plug-in for typesetting Theory).
 +
** Support for typesetting Real arithmetics (plus, unary minus, multiply, divide, less than, less than or equal, greater than, greater than or equal).
 +
* Theory Rule-based Prover (4.0.0)
 +
** Reasoners' input does not contain the proof-obligation context.
 +
** Use the current sequent's origin to get the proof-obligation context.
 +
** Bug fixed: translate formula to ensure they have the same formula factory.
 +
** Added version numbers for reasoners.
 +
** Automatic rewrite and inference tactics are re-implemented so that each rule application is visible in proof trees.
 +
* Theory UI (3.0.0)
  
−
* A Shared Machine is identified using the ''Shared Machine'' annotation.
+
===== Version 3.0.0 =====
 +
''17th December 2014''
  
−
==== The Environ Machine ====
+
Release target : Rodin 3.1
−
An Environ machine is a model of the environment. It can be used to generate code for use in a simulation, or be discarded in the case that a simulated environment is not required.
+
* migration changes to Rodin 3.1
  
−
* An Environ Machine is identified using the ''Environ Machine'' annotation.
+
===== Version 2.0.2 =====
 +
''10th July 2014''
  
−
=== Control of Program Flow ===
+
Release target : Rodin 2.8
−
At the implementation stage we need to think about controlling the flow of execution; and where interaction with the environment is concerned, how events should be implemented. The following section describes the constructs that we have introduced to facilitate this.
+
* bug fixes.  
−
==== Control Constructs ====
 
−
Each Tasking Machine has a ''task body'' which contains the flow control (algorithmic constructs).  
 
  
−
* We have the following constructs available in the Tasking Machine body:
+
===== Version 2.0.1 =====
−
** Sequence - for imposing an order on events.
+
''24th June 2014''
−
** Branch - choice between a number of mutually exclusive events.
 
−
** Loop - event repetition while it's guard remains true.
 
−
** Event - a wrapper for the Event-B element (soon to be redundant). 
 
−
** Text Output - writes textual output to the screen.
 
  
−
The syntax for task bodies, as used in the Rose TaskBody editor, is as follows:
+
Release target : Rodin 2.8
 +
* bug fixes.
  
−
<br/>
+
===== Version 2.0.0 =====
−
[[Image:Syntax.png]]
+
''30th April 2014''
−
<br/>
 
  
−
The ''String'' will be an event name, a variable name, or a text fragment to be output to the screen. The concrete syntax is shown in bold red font. '*' indicates 0 or more; [] indicates 0 or 1.
+
Release target : Rodin 2.8
 +
* Major changes in the usability.
 +
* Important bug fixes.  
  
−
===== Event Translation =====
+
===== Version 1.3.2 =====
−
When an event, used in the task body, is translated to an implementation its translation depends on where it is used in the task body. The mappings are relatively simple for branch, loop, and sequence. The Output is not linked to an event, but the Event translation depends on whether it is part of a synchronization: the simplest translation is when no synchronization is involved. The translator checks the composed machine to see if the event is paired in a combined event. If it is not, then the actions of the event are
+
''20th April 2012''
  
−
===== Synchronization =====
+
Release target : Rodin 2.4
 +
* Important bug fixes.
 +
* Improvement of deployment and un-deployment wizards
  
−
Synchronization between local events (in AutoTasks) and remote events (in shared/Environ Machines) is determined using the composed machine. To use an event simply enter its name in the TaskBody editor. The translator will in-line any local actions, and add a call to perform remote updates, and obtain remote data.
+
===== Version 1.2 =====
 +
''15th August 2011''
  
 +
Release target : Rodin 2.2.2
 +
* Bug fixes.
 +
* Added capability to instantiate multiple theorems at once.
 +
* Added automatic tactic for expanding operator definitions RbPxd·
  
−
Synchronization corresponds to:
+
===== Version 1.1 =====
−
* a subroutine call from task to shared machine, or,
+
''6th August 2011''
−
* sensing or actuating of environment variables.
 
  
−
In the case of a subroutine call the subroutine is an atomic (with respect to an external viewer) update to state. The updates in the protected resource are implemented by a procedure call to a protected object, and tasks do no share state. The synchronization construct also provides the means to specify parameter passing, both in and out of the task.
+
Release target : Rodin 2.2.2
 +
* Theory library first version.
 +
* Bug fixes.
 +
* Improved UI.
  
−
In the case of a sensing or actuating event, the updates of the action correspond to reads of monitored variables, and writes to controlled variables of the environment.
+
===== Version 1.0 =====
 +
''8th July 2011''
  
−
==== Implementing Events ====
+
Release target : Rodin 2.2
−
An event's role in the implementation is identified using the following extensions which are added to the event. Events used in task bodies are 'references' that make use of existing event definitions from the abstract development. The events are extended. to assist with translation, with a keyword indicating their role in the implementation.
 
  
−
* Event implementation role.  
+
* Bug fixes.  
−
** Branch - In essence a task's event is split in the implementation; guards are mapped to branch conditions and actions are mapped to the branch body. If the branch refers to a Shared Machine event (procedureDef) then this is mapped to a simple procedure call.  
+
* Added import relationships between theories.  
−
** Loop - The task's event guard maps to the loop condition and actions to to loop body. If the loop refers to a Shared Machine event then it is mapped to a simple procedure call.  
+
* Added experimental support for recursive definitions.
−
** ProcedureSynch - This usually indicates to the translator that the event maps to a subroutine, but an event in a task may not require a subroutine implementation if its role is simply to provide parameters for a procedure call.
+
* Improved project as well as workspace scope for mathematical and prover extensions.
−
** ProcedureDef - Identifies an event that maps to a (potentially blocking) subroutine definition. Event guards are implemented as a conditional wait; in Ada this is an entry barrier, and in C may use a pthread condition variable .
+
* Added tactic (xd) to expand all definitions.
−
** Sensing - Identifies an event that maps to a read from the environment. If the environment is simulated without address variables then the sensing event is similar to a ProcedureSynch event, in that it has an update action that models assignment of a return value from a subroutine call. The event parameters act like the ''actualIn'' parameters of a ProcedureSynch event. On the other hand, if the event has addressed variables associated with its event parameters, then they map to direct reads from memory mapped variables in the generated code.
+
* Fixed support for polymorphic theorems.
−
** Actuating - Identifies an event that maps to a write to the environment. If the environment is simulated without address variables then the actuating event has no update action, the parameters act like ''actualOut'' parameters of a ProcedureSynch event. If a sensing event has addressed variables associated with its parameters then they map to direct writes to memory mapped variables in the generated code.  
 
  
−
Sensing (and actuating) can be viewed as a kind of synchronisation. Synchronisation between tasks and shared objects are represented as subroutine calls. The sensing/actuating synchronisations only occur between tasks and the environment. In implementable code, when an subroutine is defined, its formal parameters are replaced by actual parameter values at run-time. To assist the code generator we extend the Event-B parameters. We identify formal and actual parameters in the implementation, and add the following keywords to the event parameters, as follows:
+
===== Version 0.8 =====
 +
''22nd May 2011''
  
−
* Event parameter types - Note: formal parameters are place-holders in a subroutine; they are replaced by the actual parameters at call time.
+
Release target : Rodin 2.1.1
−
** FormalIn or FormalOut - event parameters are extended with the ParameterType construct. Extension with formal parameters indicates a mapping to formal parameters in the implementation.
 
−
** ActualIn or ActualOut - Extension with an actual parameter indicates a mapping to an actual parameter in the implementation.
 
  
−
===== Addressed Variables =====
+
* Bug fixes.
−
When sensing monitored variables, or actuating controlled variables in the environment, we may wish to use explicit memory addresses for use in the final implementation, or perhaps in the environment simulation too. We can link a task's event parameters, and an Environ machines variables, with specific addresses and use these in the generated code.
+
* Added import relationships between theories.
 +
* Added experimental support for recursive definitions.
 +
* Added project as well as workspace scope for mathematical and prover extensions.
  
−
== References ==
+
===== Version 0.7 =====
 +
''11th April 2011''
  
−
<references/>
+
Bug fixes. Fixed for Rodin 2.1.1.
  
 +
===== Version 0.6 =====
 +
''6th January 2011''
  
−
[[Category:User documentation]]
+
Minor bug fixes and improvements to theories pretty printer.
 +
 
 +
===== Version 0.5 =====
 +
''28th October 2010''
 +
 
 +
This is the first release of the Theory plug-in with support for mathematical as well as prover extensions.
 +
 
 +
===Features Requests and Bugs===
 +
Please do not hesitate to raise any issues with regards to usability as well as efficiency. Finally, please remember to report any bugs through the SourceForge portal.

Revision as of 14:31, 22 December 2020

Back to Theory Plug-in.

Follow this page for the latest on the Theory plug-in. The user manual is also provided together with the installation details.

News

  • 22th December 2020: Version 4.0.1 is released. It requires Rodin 3.5.
  • 19th December 2014: Version 3.0.o is released. It requires Rodin 3.1.
  • 10th July 2014: Version 2.0.2 is released. It requires Rodin 2.8.
  • 24th June 2014: Version 2.0.1 is released. It requires Rodin 2.8.
  • 30th April 2014: Version 2.0.0 is released. It requires Rodin 2.8. This release contains major changes in the features and accessibilities.
  • 20th April 2012: Version 1.3.2 is released. It requires Rodin 2.4.
  • 15th August 2011: Version 1.2 is released. It requires Rodin 2.2.2.
  • 6th August 2011: Version 1.1 is released. It requires Rodin 2.2.2.
  • 8th July 2011: Version 1.0 is released. It requires Rodin 2.2.
  • 22nd May 2011: Version 0.8 released. It is based on Rodin 2.1.1.
  • 11th April 2011: Version 0.7 released. It is based on Rodin 2.1.1.
  • 6th January 2011: Version 0.6 released. It is based on Rodin 2.0.1.
  • 28th October 2010: Version 0.5 released. It is based on Rodin 2.0.

Releases

Version 4.0.1

22th December 2020

Release target: Rodin 3.5

  • Bug fixes:
    • The theory plugin now takes into account updates in theories, as well as creating a theory after using it (there was a cache issue).
    • The error messages at launch about rule-based provers failing to find the context of the proof have been removed.
    • The dropdown list in theory imports is now usable (there was an off-by-one issue when selecting an element in the list).
    • Manually applying an inference rule no longer throws a NullPointerException.
    • It is now possible to rename theories.
    • The TheoryPath creation dialog box has been simplified.
  • Optimizations:
    • The proving interface is now much more responsive, even when a theory contains a lot of rewrite rules (we have implemented a cache of the places where a rewrite rule can apply).
    • The theory plugin now generates much simpler WD conditions, especially for the pred, succ, prj1, prj2, and id operators.
Version 4.0.0-RC1

10th April 2017

Release target: Rodin 3.2

  • AST Extensions (4.0.0) Major API change.
    • Compatibility upgrade to Rodin 3.2
    • Support for get operator position for INFIX extended predicate operators.
    • Improve pattern matching for associative operators.
  • Theory plug-in Branding (0.0.1) Initial version
  • Theory Core (4.0.0) Internal implementation changes.
    • Compatibility upgrade to Rodin 3.2
    • Support for INFIX extended predicate operators.
    • Various bugs fixed.
  • Theory help (2.0.0) User documentations.
  • Theory Keyboard (0.0.1) Initial version (A special plug-in for typesetting Theory).
    • Support for typesetting Real arithmetics (plus, unary minus, multiply, divide, less than, less than or equal, greater than, greater than or equal).
  • Theory Rule-based Prover (4.0.0)
    • Reasoners' input does not contain the proof-obligation context.
    • Use the current sequent's origin to get the proof-obligation context.
    • Bug fixed: translate formula to ensure they have the same formula factory.
    • Added version numbers for reasoners.
    • Automatic rewrite and inference tactics are re-implemented so that each rule application is visible in proof trees.
  • Theory UI (3.0.0)
Version 3.0.0

17th December 2014

Release target : Rodin 3.1

  • migration changes to Rodin 3.1
Version 2.0.2

10th July 2014

Release target : Rodin 2.8

  • bug fixes.
Version 2.0.1

24th June 2014

Release target : Rodin 2.8

  • bug fixes.
Version 2.0.0

30th April 2014

Release target : Rodin 2.8

  • Major changes in the usability.
  • Important bug fixes.
Version 1.3.2

20th April 2012

Release target : Rodin 2.4

  • Important bug fixes.
  • Improvement of deployment and un-deployment wizards
Version 1.2

15th August 2011

Release target : Rodin 2.2.2

  • Bug fixes.
  • Added capability to instantiate multiple theorems at once.
  • Added automatic tactic for expanding operator definitions RbPxd·
Version 1.1

6th August 2011

Release target : Rodin 2.2.2

  • Theory library first version.
  • Bug fixes.
  • Improved UI.
Version 1.0

8th July 2011

Release target : Rodin 2.2

  • Bug fixes.
  • Added import relationships between theories.
  • Added experimental support for recursive definitions.
  • Improved project as well as workspace scope for mathematical and prover extensions.
  • Added tactic (xd) to expand all definitions.
  • Fixed support for polymorphic theorems.
Version 0.8

22nd May 2011

Release target : Rodin 2.1.1

  • Bug fixes.
  • Added import relationships between theories.
  • Added experimental support for recursive definitions.
  • Added project as well as workspace scope for mathematical and prover extensions.
Version 0.7

11th April 2011

Bug fixes. Fixed for Rodin 2.1.1.

Version 0.6

6th January 2011

Minor bug fixes and improvements to theories pretty printer.

Version 0.5

28th October 2010

This is the first release of the Theory plug-in with support for mathematical as well as prover extensions.

Features Requests and Bugs

Please do not hesitate to raise any issues with regards to usability as well as efficiency. Finally, please remember to report any bugs through the SourceForge portal.

Retrieved from ‘https://wiki.event-b.org/index.php?title=Tasking_Event-B_Overview&oldid=14400’