Or you can also consider using IPC::Shareable <https://metacpan.org/pod/IPC::Shareable> if your system supports IPC.
Jacques Deguest On 2021/08/25 17:11, Brad Van Sickle wrote: > I've shared read-only data across threads many times a cheap and easy > caching mechanims, but as I'm sure you've found in your research, the > "copy-on-write" methodology employed by mod_perl prevents you from > doing that for mutable data and I'm not aware of a way around that > without fundamental changes to mod_perl itself. > > There are some very good reasons that mod_perl is architected that > way. You may very well have a specific use case that makes sharing > mutable data in memory for a threaded application desirable, but I > know that oftentimes when I've tried to find ways to workaround a > fundamental architectural element in a toolset, the best solution for > me has ultimately been to rethink my approach rather than to wrestle > the toolset into submission. > > In short, and although this isn't what you asked and I know next to > nothing about your project, constraints or requirements... it sounds > like you might want to consider a cache server > (Redis/Varnish/Elasticache/etc...) and then solve the problem and > proactively notify subscribed threads of changes if you need to. > > > > > On 8/24/2021 7:50 PM, David Booth wrote: >> I am using Apache/2.4.41 (Ubuntu), with mod_perl. Apache uses >> multiple threads, and I want to share read/WRITE data between >> threads. (I.e., I want to be able to modify some shared data in one >> thread, such that other threads can see those changes.) In >> "Practical mod_perl" Stas Bekman describes how to share read-only >> data between threads, but says nothing about how to share WRITABLE >> data between threads. >> >> Any clues about how this can be done? I've searched high and low and >> found nothing. I will also want to know what mechanisms are >> available to coordinate access to that shared data, such as locks or >> semaphores. >> >> I also posted this message to StackOverflow, but got no response so far: >> https://stackoverflow.com/questions/68901260/how-to-share-read-write-data-in-mod-perl-apache2 >> >> >> Any help would be appreciated! >> >> Thanks, >> David Booth
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