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Threads

  

Create

  

evaluate an expression in a new thread

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

Create( expr, opt1, opt2, ... )

Create( expr, var, opt1, opt2, ... )

Parameters

expr

-

(anything) the expression to evaluate in the new thread

var

-

(name) (optional) an output variable for the result

opt1, opt2, ...

-

optional arguments

Description

• 

The Create command is used to start evaluating a Maple expression in a new thread.  This command returns an integer identifier for the new thread.

• 

When the evaluation of expr is finished, the thread terminates.  If var is given, the result of the evaluation is assigned to var.

• 

The identifier returned by Create can be passed into Wait.

• 

Due to the unique functionality of Create, there are special evaluation rules for expr.  If expr is a procedure, then the arguments to the procedure are evaluated in the current thread, but the function call itself is evaluated in the new thread.  If expr is not a procedure, then it is evaluated entirely in the new thread.

• 

One side effect of these rules is that if expr is a function call, with another function call as an argument, the argument will be evaluated in the current thread, not the new thread.

• 

There is one optional argument: stacksize

  

stacksize = integer

The stacksize optional argument specifies the maximum amount of stack space available to the new thread.  The maximum stack size of a thread is fixed at thread creation time and cannot be changed.  By default the stack size is the minimum allowed stack, which is platform dependent.

Examples

with(Threads);
p := proc( n )
   local j;
   global i;
   
   for j from 1 to n
   do
       i := j;
   end do;
end proc:

Add,ConditionVariable,Create,Map,Mul,Mutex,Self,Seq,Sleep,Task,Wait

(1)

idCreatep106

id:=1

(2)

forjto104doend do:

i

86369

(3)

Waitid

i

1000000

(4)

idCreate∫sinxxⅆx,d

id:=2

(5)

d

d

(6)

Waitid

d

∫sinxxⅆx

(7)

See Also

Threads

Threads[ConditionVariable]

Threads[Mutex]

Threads[Self]

Threads[Wait]

 


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