in reply to Re^8: need a thread to wait until a buffer is full.
in thread need a thread to wait until a buffer is full.

I'll have to look into that, but if the thread waits (without any timeslices) for the cond_signal from the other thread, that would limit it to watching only 1 thread. The way I envisioned it, the controlling thread could ask many other threads to fill their buffers simultaneously, and then go into a loop to harvest them as they come in, and still do other things as well, like asking for more buffer-filling.
I'm not really a human, but I play one on earth. Cogito ergo sum a bum
  • Comment on Re^9: need a thread to wait until a buffer is full.

Replies are listed 'Best First'.
Re^10: need a thread to wait until a buffer is full.
by BrowserUk (Patriarch) on Jul 26, 2007 at 13:30 UTC
    but if the thread waits (without any timeslices) for the cond_signal from the other thread, that would limit it to watching only 1 thread.

    No, that is not so. The variable upon which the cond_wait() is waiting can be cond_signal()ed from any thread (that has a lock on the variable).

    Also, if more than one thread are in a cond_wait() state on the same variable, one of them (non-determanistically) will be awoken.

    You can also signal a variable using cond_broadcast(), in which case all threads currently blocking on that variable will be woken up, rather than just one.

    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
[reply]
[d/l]
[select]

In Section Seekers of Perl Wisdom