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@m0wfo m0wfo/gist:202591
Created Oct 5, 2009

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#include <dispatch/dispatch.h>
#include <ruby/ruby.h>
VALUE primes;
static VALUE primes_new(VALUE self)
{
return self;
}
// MY LATEST ATTEMPT USING GRAND CENTRAL
static VALUE primes_generate(VALUE self)
{
int i;
__block VALUE final;
__block int j;
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_queue_t private_queue = dispatch_queue_create("com.ruby.queue", NULL);
dispatch_group_t group = dispatch_group_create();
for ( i = 2; i < 100000; i++ ) {
// dispatch_retain(private_queue);
dispatch_group_async(group, queue, ^{
for ( j = 2; j <= i/2; j++ ) {
if ( ! ( i % j ) ) break;
}
if ( j > i / 2 ) {
dispatch_sync(private_queue, ^{ final = INT2FIX(i); });
// dispatch_release(private_queue);
}
});
}
dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
return final;
}
// THE ORIGINAL VANILLA RUBY METHOD
// static VALUE primes_generate(VALUE self)
// {
// VALUE final = INT2FIX(0);
// int i, j;
//
// for ( i = 2; i < 100000; i++ )
// {
// for ( j = 2; j <= i/2; j++ )
// {
// if ( ! ( i % j ) ) break;
// }
//
// if ( j > i / 2 ) {
// final = INT2FIX(i);
// }
// }
// return final;
// }
void Init_primes()
{
primes = rb_define_class("Primes", rb_cObject);
rb_define_method(primes, "intialize", primes_new, 0);
rb_define_method(primes, "generate", primes_generate, 0);
}
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