Re: [Factor-talk] messaging between native vm threads
No native mutex is needed if you have a pair of pipes between every two VMs that need to communicate. Then, one VM thread writes to the pipe, another VM thread reads from it. Since a VM thread is so heavy-weight (it has its own data heap) opening a handful of pipes is nothing. What you do need for correct semantics though is a lightweight lock for co-operative threads (using the existing concurrency.locks), to avoid the following race condition: - co-operative thread A wants to send message to co-operative thread C in VM Y - co-operative thread A writes message to pipe - co-operative thread A yields because its doing blocking I/O - co-operative thread B begins running - co-operative thread B wants to send message to co-operative thread D in VM Y - VM-thread X writes message to pipe, now two messaged are interleaved To solve this you need to ensure that if a co-operative thread yields while sending a message to a given VM, no other thread can send a message before it is done, and a lock will accomplish exactly this. Slava On Fri, Oct 23, 2009 at 8:21 AM, Phil Dawes p...@phildawes.net wrote: Makes sense. I was hoping to just pass an fd/Handle on vm startup but I guess an alien address to a FD/mutex pair isn't much different. I'd have to do the same for a malloc'd message queue anyway. -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
[Factor-talk] Remove [let, [let*, [wlet and leave : to simplify locals?
There's a bit of redundancy in locals. You can bind a variable using :, [let, or [let*, and the two latter forms just get transformed into the former behind the scenes. The [let forms also seem unnecessarily bulky compared to : . What would you all say to phasing out the [let forms and just leaving : ? Also, nobody appears to use [wlet . Would anyone object to that being removed? -Joe -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
Re: [Factor-talk] Remove [let, [let*, [wlet and leave : to simplify locals?
: et [let are different because : can't be used everywhere. From the docs: Notes This word ( : ) can only be used inside a lambda word, lambda quotation or let binding form. : toto ( a b -- c ) [let | b' [ 6 * ] | b' + ] ; ! works : toto ( a b -- c ) 6 * : b' b' + ; ! does not work I like the [let form better than :, but that's just my opinion, and I'm very new to factor. On Sun, Oct 25, 2009 at 11:20 AM, Joe Groff arc...@gmail.com wrote: There's a bit of redundancy in locals. You can bind a variable using :, [let, or [let*, and the two latter forms just get transformed into the former behind the scenes. The [let forms also seem unnecessarily bulky compared to : . What would you all say to phasing out the [let forms and just leaving : ? Also, nobody appears to use [wlet . Would anyone object to that being removed? -Joe -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk -- Jon Harper -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
