Hi, as i've mentioned, that's up to implementation, for more infos please pay attention to
http://en.wikipedia.org/wiki/Coroutine#Implementations_for_C Well, the libtask mentioned there isn't thread safe (but could be made). Especially have earned some attention http://msdn.microsoft.com/en-us/library/windows/desktop/ms684847(v=vs.85).aspx#fiber_functions and https://github.com/stevedekorte/coroutine which is portable. Regards Anatoliy Am Mo, 11.06.2012, 23:12 schrieb Tom Boutell: > Can you really use setjmp and longjmp in that way safely? I thought it > was only safe to longjmp "back," not "forward" - you can use them to > fake exception support but that's it because you'll smash the stack > otherwise. Something like that... > > OK, I'm thinking of this: > > "Similarly, C99 does not require that longjmp preserve the current > stack frame. This means that jumping into a function which was exited > via a call to longjmp is undefined.[6] However, most implementations > of longjmp leave the stack frame intact, allowing setjmp and longjmp > to be used to jump back-and-forth between two or more functions?a > feature exploited for multitasking." > > It does not sound like something that can be done in portable C. > > On Mon, Jun 11, 2012 at 4:13 PM, Anatoliy Belsky <a...@php.net> wrote: >> Hi, >> >> it'd be really cool if the implementation would do the "real" context >> switch in c, which would be the true basis for spl_coroutine. The >> current >> implementation seems not to do that. >> >> Context switch in c would be comparable with threads. In fact coroutines >> would be a comensation for lacking threads functionality in php, as they >> are already implemented on most popular platforms. However, it would >> require some platform specific libs (fibers on windows, setjmp and >> longjmp >> on unix(like)). >> >> Coroutines in c are per se thread safe, so implementing them once would >> not hurt both ts and nts. Additionally, in some cases coroutines can >> even >> have advantages over the "usual" preemptive threads. >> >> Regards >> >> Anatoliy >> >> Am Mi, 6.06.2012, 04:42 schrieb Laruence: >>> On Wed, Jun 6, 2012 at 10:27 AM, Laruence <larue...@php.net> wrote: >>>> On Wed, Jun 6, 2012 at 10:15 AM, Laruence <larue...@php.net> wrote: >>>>> Hi Nikita: >>>>> >>>>> the most important part to me is how did you implemented `yield` >>>>> keyword, is there a whole patch file I can look into? >>>> Nervermind, I will check the branch out later >>>> >>>> thanks >>> >>> After a quick look, I think the main idea should goes to two parts: >>> >>> 1. implement yield (Zend) >>> 2. implement spl_generators but not generator class (Spl) >>> >>> then we can implement spl_coroutine later base on this. what do you >>> think? >>> >>> thanks >>>>> >>>>> what will happen if you use a `yield` in a normal function? >>>>> >>>>> actually, I tried to implemented coroutine, but since I could not >>>>> find a way to make zend_execute interruptable, then I didn't make it. >>>>> >>>>> so, I am really interesting of this tech-specific :) >>>>> >>>>> thanks >>>>> >>>>> On Wed, Jun 6, 2012 at 1:35 AM, Nikita Popov >>>>> <nikita....@googlemail.com> wrote: >>>>>> Hi internals! >>>>>> >>>>>> In the last few days I've created a proof of concept implementation >>>>>> for generators in PHP. It's not yet complete, but the basic >>>>>> functionality is there: >>>>>> https://github.com/nikic/php-src/tree/addGeneratorsSupport >>>>>> >>>>>> The implementation is outlined in the RFC-stub here: >>>>>> https://wiki.php.net/rfc/generators >>>>>> >>>>>> Before going any further I'd like to get some comments about what >>>>>> you >>>>>> think of adding generator support to PHP. >>>>>> >>>>>> If you don't know what generators are you should have a look at the >>>>>> "Introduction" section in the above RFC or in the Python >>>>>> documentation >>>>>> at http://wiki.python.org/moin/Generators. >>>>>> >>>>>> Nikita >>>>>> >>>>>> -- >>>>>> PHP Internals - PHP Runtime Development Mailing List >>>>>> To unsubscribe, visit: http://www.php.net/unsub.php >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Laruence Xinchen Hui >>>>> http://www.laruence.com/ >>>> >>>> >>>> >>>> -- >>>> Laruence Xinchen Hui >>>> http://www.laruence.com/ >>> >>> >>> >>> -- >>> Laruence Xinchen Hui >>> http://www.laruence.com/ >>> >>> -- >>> PHP Internals - PHP Runtime Development Mailing List >>> To unsubscribe, visit: http://www.php.net/unsub.php >>> >>> >> >> >> >> -- >> PHP Internals - PHP Runtime Development Mailing List >> To unsubscribe, visit: http://www.php.net/unsub.php >> > > > > -- > Tom Boutell > P'unk Avenue > 215 755 1330 > punkave.com > window.punkave.com > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > > -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
