Re: [fpc-pascal] Solution for Timer in daemon
On 03/01/2013 07:10 PM, Krzysztof wrote: Hi, I'm reading that I can't use timer in daemon because daemon core is based on thread. daemonapp is using threads but nothing stops you from daemonizing your app yourself with a simple fork. So I'm trying to create another thread which simulate timer. My interval is quite big (~1-5 minutes), so I can't just use sleep(6) because daemon will hung on terminate. So I have two ideas: 1. Create loop with short sleep(1000) which on each loop check if main interval occur and check if daemon is terminated 2. Create loop with RTL event with RtlEventWaitFor(Event, 6) and daemon on terminate just send event to worker so it immediately exit. What is the best efficient solution? Maybe exists another way? Very difficult to give an absolute answer without knowing what the daemon is doing. On unix, an alternate solution is to use fpSelect (Function fpSelect(N:cint;readfds,writefds,exceptfds:pfdSet;TimeOut:PTimeVal):cint; ) and specify a time-out value. You can specify a signal with exceptfds or a file descriptor with readfds/writefds that will trigger the return of select. I have written a few daemons that are stopped by sending them a signal. fpSelect is then a natural solution. If your daemon is already receiving control data from the outside through sockets, FIFO's or whatever file, simply attach the select to the file descriptor of that channel. Note that the time precision of loops using sleep is not good at all. Use fptime to decide when to trigger the task. If a precision higher than 1000ms is needed, nothing stops you from modulating the sleep time based on fptime so that the last sleep expires at the time wanted. So the best solution really depends on what else you are doing in the daemon. Ludo ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Solution for Timer in daemon
On Sat, 2 Mar 2013, Ludo Brands wrote: On 03/01/2013 07:10 PM, Krzysztof wrote: Hi, I'm reading that I can't use timer in daemon because daemon core is based on thread. daemonapp is using threads but nothing stops you from daemonizing your app yourself with a simple fork. The threads are not there for daemonizing. They are there because a single app can host multiple services (daemons) as on Windows. So I'm trying to create another thread which simulate timer. My interval is quite big (~1-5 minutes), so I can't just use sleep(6) because daemon will hung on terminate. So I have two ideas: 1. Create loop with short sleep(1000) which on each loop check if main interval occur and check if daemon is terminated 2. Create loop with RTL event with RtlEventWaitFor(Event, 6) and daemon on terminate just send event to worker so it immediately exit. What is the best efficient solution? Maybe exists another way? Very difficult to give an absolute answer without knowing what the daemon is doing. On unix, an alternate solution is to use fpSelect (Function fpSelect(N:cint;readfds,writefds,exceptfds:pfdSet;TimeOut:PTimeVal):cint; ) and specify a time-out value. I would go for this. Michael. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
[fpc-pascal] Solution for Timer in daemon
Hi, I'm reading that I can't use timer in daemon because daemon core is based on thread. So I'm trying to create another thread which simulate timer. My interval is quite big (~1-5 minutes), so I can't just use sleep(6) because daemon will hung on terminate. So I have two ideas: 1. Create loop with short sleep(1000) which on each loop check if main interval occur and check if daemon is terminated 2. Create loop with RTL event with RtlEventWaitFor(Event, 6) and daemon on terminate just send event to worker so it immediately exit. What is the best efficient solution? Maybe exists another way? Regards. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Solution for Timer in daemon
From: Krzysztof dib...@wp.pl To: fpc-pascal fpc-pascal@lists.freepascal.org Sent: Friday, March 1, 2013 3:10 PM Subject: [fpc-pascal] Solution for Timer in daemon Hi, I'm reading that I can't use timer in daemon because daemon core is based on thread. So I'm trying to create another thread which simulate timer. My interval is quite big (~1-5 minutes), so I can't just use sleep(6) because daemon will hung on terminate. So I have two ideas: 1. Create loop with short sleep(1000) which on each loop check if main interval occur and check if daemon is terminated 2. Create loop with RTL event with RtlEventWaitFor(Event, 6) and daemon on terminate just send event to worker so it immediately exit. What is the best efficient solution? Maybe exists another way? Regards. Well, as far as I know, sleep is no thread safe, it will block your app. Leonardo M. Ramé http://leonardorame.blogspot.com ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Solution for Timer in daemon
On 01.03.2013 19:28, Leonardo M. Ramé wrote: From: Krzysztof dib...@wp.pl To: fpc-pascal fpc-pascal@lists.freepascal.org Sent: Friday, March 1, 2013 3:10 PM Subject: [fpc-pascal] Solution for Timer in daemon Hi, I'm reading that I can't use timer in daemon because daemon core is based on thread. So I'm trying to create another thread which simulate timer. My interval is quite big (~1-5 minutes), so I can't just use sleep(6) because daemon will hung on terminate. So I have two ideas: 1. Create loop with short sleep(1000) which on each loop check if main interval occur and check if daemon is terminated 2. Create loop with RTL event with RtlEventWaitFor(Event, 6) and daemon on terminate just send event to worker so it immediately exit. What is the best efficient solution? Maybe exists another way? Regards. Well, as far as I know, sleep is no thread safe, it will block your app. Sleep only blocks the current thread. Regards, Sven ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Solution for Timer in daemon
On Fri, 1 Mar 2013 10:28:20 -0800 (PST) Leonardo M. Ramé martinr...@yahoo.com wrote: [...] Well, as far as I know, sleep is no thread safe, it will block your app. sleep blocks only the thread. Mattias ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Solution for Timer in daemon
I know how sleep blocking works in thread :) . I'm just wondering what is better, sleep or RTL event or something else ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Solution for Timer in daemon
On 01.03.2013 21:17, Krzysztof wrote: I know how sleep blocking works in thread :) . I'm just wondering what is better, sleep or RTL event or something else You might know, but we answered to Leonardo who does not seem to know ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
