Creating implementation for idiom 241 : Yield priority to other threads

Idiom

# 241 Yield priority to other threads

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Explicitly decrease the priority of the current process, so that other execution threads have a better chance to execute now. Then resume normal execution and call the function busywork.

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Other implementations

System.Threading

Thread.Yield();
busywork();

import "runtime"

runtime.Gosched()
busywork()

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Thread.yield();
busywork();

uses Classes;

TThread.Yield;
busywork;

use Coro;

sub busywork { print 'busy' };

my $n = 12;

my $th_sub = sub {
    my ($limit) = @_;
    foreach ( 1 .. $limit ) {
       print '.';
       cede;
    }
};

my $th = Coro->new( $th_sub, $n );

$th->ready;

foreach my $ii ( 1 .. $n ) {
    if ( $ii == int $n * 2/3 ) {
        $Coro::current->prio(-1);
        cede;
        busywork();
    }
    print '-';
    cede;
}

::std::thread::yield_now();
busywork();

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