Hello, fellow monks.

I am aware that the 5.8 threads model differs from system to system and compiling options so after reading the POD over and over, super-searching PM and reading up on several thread-threads, and actual code testing, I am still left with some doubt, and would greatly appreciate any experts here for their $0.02!

First, I assume that the Linux, FreeBSD and most other Unix or Unix-like systems, except perhaps for Solaris, must have very similar threads implementations with the vanilla Perl 5.8.x offered in these platforms. I would assume that for example in most Linux systems, a vanilla Perl threads implementation will use, or compiled by default to use LWP aka Kernel Threads. Any in-depth comments for *nix OSs here very welcome.

Second, and my actual question is that if using threads->yield _plus_ a millisecond delay with Time::HiRes is redundant, and if the snippet below is doing what I want: to yield at least 250 milliseconds of time to other threads before checking for the queue again. I am thinking that the yield is actually issuing a single no-op and really isn't doing much... but is the usleep() accomplishing what I need?

Thridly, I would like to know if using Time::HiRes is thread safe, especially if I'm using Perl GTK2 which make everything a lot more fragile (not because of Perl but because of GTK-intrinsic threading flaws, which I have already learned to tame for the most part). 

  REPEAT:

  [...]

  # gomr note ready yet...
  if($imgaq->pending){
    # yield CPU...
    threads->yield;
    # 250 milisecond delay
    usleep(250000);
    warn "GOMR NOT READY...";
    goto REPEAT;
  }

[download]


Thanks a bunch in advance,
Alejandro Imass

In reply to Perl threads: using yield() and Time::HiRes usleep() in Linux/*nix by ait

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