Re: [Vala] Coroutines / async methods - info needed for talk

["Sam Liddicott" <sam liddicott com>]

* Frederik wrote, On 11/03/09 10:38:

Sam Liddicott wrote:
  

I've come up with this Vala example to help me see what is going on:

using GLib;

int foo (int y) yields {
  int x;
  x=1;
  message ("hello");
  yield;
  y=2;
  message ("world");
  yield;
  y=3;
  message ("thats all folks");
  return 5;
}

void main () {
  foo.begin (0);
  message ("vala");

  var loop = new MainLoop (null, false);
  loop.run ();
}
    

Does this compile for you? For me it doesn't (latest Vala from git):
  

Me too, and I don't even know if it is because the vala is invalid because I can't find clearer examples or instructions.

async.c: In function 'foo':
async.c:32: error: 'data' undeclared (first use in this function)
async.c:32: error: (Each undeclared identifier is reported only once
async.c:32: error: for each function it appears in.)
async.c:35: error: case label not within a switch statement
async.c:41: error: case label not within a switch statement
async.c: In function 'foo_co':
async.c:83: error: 'x' undeclared (first use in this function)
async.c:89: error: 'y' undeclared (first use in this function)
error: cc exited with status 256
Compilation failed: 1 error(s), 0 warning(s)
  

Yeah, but it can still be instructive to look at the generated C - but not only does it not compile, it looks wrong too, when you try and make sense of the C - and I don't just mean the stepped switch/case statement in foo_co which looks abominable and surely will interleave badly with any vala case statements.

Sam