On Friday, November 25, 2016 at 4:12:54 PM UTC+8, Gaurav Halwasia wrote:
> I have a scenario where i have a libuv event loop and at some point of
> time in my application (C application), i start the timer
> uv_timer_init(&link->loop, timer);
> uv_timer_start(timer, modbus_ctl_periodic_monitor, 0, 1000);
> But i see that there are times when this timer goes off periodically
> correctly from the beginning and repeats thereafter. But i see that some
> times, it takes few seconds (20 to 40 seconds in my case) for the timer to
> get fired first time and then it repeats correctly thereafter.
> I am not able to understand/debug why this initial delay is there
> During the time when this initial delay is there i see that uv_run is
> stuck as can be seen below.
> #0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
> #1 0x000000000041a78a in uv.epoll_wait ()
> #2 0x0000000000418ddc in uv.io_poll ()
> #3 0x0000000000410030 in uv_run ()
> #4 0x00007ffff70b6802 in dslink_handshake_handle_ws () from
> #5 0x00007ffff70b25db in dslink_init () from
> When starts working, i see that uv_run has called uv_run_timers.
> (gdb) bt
> #0 0x00007ffff6ba3c53 in select () at
> #1 0x00007ffff6e7daf5 in _connect (sockfd=29,
> addr=addr@entry=0x7ffff3754bd0, addrlen=addrlen@entry=16,
> ro_tv=ro_tv@entry=0x7fffdc0079e0) at modbus-tcp.c:284
> #2 0x00007ffff6e7dbcc in _modbus_tcp_connect (ctx=0x7fffdc0079d0) at
> #3 0x000000000040ca63 in mb_master_connect (mb_ctl=0x7fffc800d190) at
> #4 0x000000000040b868 in modbus_read_snapshot (mb_ctl=0x7fffc800d190) at
> #5 0x000000000040bac4 in modbus_ctl_periodic_monitor
> (timer=0x7fffc8010690) at modbus_ctrl.c:569
> #6 0x00000000004170ae in uv.run_timers ()
> #7 0x000000000040ff9a in uv_run ()
> #8 0x00007ffff70b6802 in dslink_handshake_handle_ws () from
> Can someone shed more light on this and help me resolve this issue..
Did you do some slow work in the uv thread ? does function
`modbus_ctl_periodic_monitor` execute for a long time ?
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