std.concurrency.scheduler - multiple declarations

This variable sets the Scheduler behavior within this program. Typically, when setting a Scheduler, scheduler.start() should be called in main. This routine will not return until program execution is complete.

Declaration

Scheduler scheduler;

Implementing a Scheduler allows the concurrency mechanism used by this module to be customized according to different needs. By default, a call to spawn will create a new kernel thread that executes the supplied routine and terminates when finished. But it is possible to create Schedulers that reuse threads, that multiplex Fibers (coroutines) across a single thread, or any number of other approaches. By making the choice of Scheduler a user-level option, std.concurrency may be used for far more types of application than if this behavior were predefined.

Properties

Methods

Example

import std.concurrency;
import std.stdio;

void main()
{
    scheduler = new FiberScheduler;
    scheduler.start(
    {
        writeln("the rest of main goes here");
    });
}

Some schedulers have a dispatching loop that must run if they are to work properly, so for the sake of consistency, when using a scheduler, start() must be called within main(). This yields control to the scheduler and will ensure that any spawned threads are executed in an expected manner.