Hello! On Tue, Mar 09, 2021 at 01:00:20AM -0500, klowd92 wrote:
> Hi Everyone, > > I am developing an nginx module. > The module requires some background processing via thread when the server is > running. > > I have written my module to use pthread.h > I have attempted to spawn a thread during the init_module function > (specified in ngx_module_t of the module) > Unfortunately this thread is terminated after the init_module function is > done. I need the thread to continue running indefinitely. > > I have also tried to create a thread during the init_process function, which > also fails. > > nginx is compiled with threadpool and fileio support. > > Is it possible to have my module use pthread.h and run pthead_create() to > have create threads during the execution of nginx, which stay alive throught > the life of the program? > My attempts all failed as soon as the module return execution the nginx, the > threads are terminated. While you should be able to create threads if implemented properly, this is usually a bad idea. Quoting development guide (http://nginx.org/en/docs/dev/development_guide.html#threads_pitfalls): It is recommended to avoid using threads in nginx because it will definitely break things: most nginx functions are not thread-safe. It is expected that a thread will be executing only system calls and thread-safe library functions. If you need to run some code that is not related to client request processing, the proper way is to schedule a timer in the init_process module handler and perform required actions in timer handler. Internally nginx makes use of threads to boost IO-related operations, but this is a special case with a lot of limitations. -- Maxim Dounin http://mdounin.ru/ _______________________________________________ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
