IForeThread.Start

Syntax

Start([Param: Variant = Null]);

Parameters

Param. Parameter value that will be passed to the executed method.

Description

The Start method starts the stream for execution.

Comments

When the Start method is called, the custom method is started for execution that was specified in the Create constructor. If the custom method has a parameter in its signature, one can use Param to pass the required value or array odf values to the method.

Example

Executing the example requires that the repository contains a unit with the M_THREAD_CALC identifier. The specified methods are implemented in the unit.

Add a link to the Fore system assembly.

Sub UserProc;
Var
    Method: IForeMethod;
    Th1, Th2: IForeThread;
Begin
    Method := New ForeMethod.Create;
    Method.Assembly := "M_THREAD_CALC";
    Method.Method := "Init";
    //Create a thread
    Th1 := New ForeThread.Create(Method);
    Th1.Name := "Prepare to calculate";
    Th1.Start;
    //Wait until the Init method end in thread
    Th1.Join;
    //Create threads based on the Calculate method
    Method.Method := "Calculate";
    Th1 := New ForeThread.Create(Method);
    Th1.Name := "General calculation";
    Th2 := New ForeThread.Create(Method);
    Th2.Name := "High-precision calculation";
    //Start parallel execution of threads with different parameter values
    Th1.Start(0.00001);
    Th2.Start(0.0000001);
    While (Th1.State = ForeThreadState.Running) Or (Th2.State = ForeThreadState.Running) Do
        //...
        //Monitor thread state
        //...
    End While;
    Debug.WriteLine("End");
End Sub UserProc;

Sub Init;
Begin
    Debug.WriteLine("Init");
    //...
    //Prepare to calculate
    //...
End Sub Init;

Sub Calculate(Error: Double);
Begin
    Debug.WriteLine(Error);
    //...
    //Operations to execute some calculation
    //...
End Sub Calculate;

Executing the example creates a thread connected with the Init custom method. The thread will be started, the current code will wait until thread execution end. After this, two threads are created that are connected with the Calculate custom method. The threads are started in parallel with different parameter values. The thread state is monitored in the cycle until the threads are completed.