From: SASADA Koichi <ko1@...>
Date: 2007-12-07T19:10:32+09:00
Subject: Re: How to have fine grain control over GL in C extensions

Hi,

hemant wrote:
> Well.. first I am not able to handle interupts and signals. I tried
> CHECK_INTS and RUBY_VM_CHECK_INTS both and it throws undefined symbol
> error.

OK.  I'll add a C API such as rb_thread_interrupted(void).  But you
don't need this API on your example.

> Also, I do not think, both functions are getting executed
> concurrently. Is there anything else I need to do?

2 comments:

  1. Ruby is already concurrent thread.  You may mean "parallel".
     So Ruby's thread is "ConcurrentThread".

  2. It seems run in parallel.  Why do you think so?

> Last and final question is, how am i supposed to interupt
> count_to_100000 method from stop_thr1 ?

example:

static void count_to_10000(void* data){
  int i = 0;
  for( i = 0; i < 10000; i++ ) {
    if ((*(VALUE *)data) == Qtrue) {
      break;
    }
    printf("Currently Counting from thr 1: %d\n",i);
  }
}

static void stop_thr1(void* data) {
  printf("Calling thread1 break method\n");
  *((VALUE *)data) = Qtrue;
}

static VALUE rb_concurrent_thread_method(VALUE self)
{
  VALUE interrupt_flag;
  rb_thread_blocking_region(count_to_10000, &interrupt_flag,
                            stop_thr1, &interrupt_flag);
}


-- 
// SASADA Koichi at atdot dot net