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Re: silent PC vs. emacs


From: Eli Zaretskii
Subject: Re: silent PC vs. emacs
Date: Sat, 02 Sep 2006 19:46:37 +0300

> Date: Sat, 2 Sep 2006 09:11:42 -0700
> From: Dan Nicolaescu <address@hidden>
> Cc: address@hidden, address@hidden, address@hidden
> 
> On my Fedora Core 5 machine, emacs compiled with the Lucid toolkit
> doing:
> 
> emacs -D -Q&
> strace -p PID_OF_EMACS
> 
> Prints things like this a few times a second:
> 
> gettimeofday({1157213370, 605043}, NULL) = 0
> select(5, [4], NULL, NULL, {25, 670718}) = ? ERESTARTNOHAND (To be restarted)
> --- SIGALRM (Alarm clock) @ 0 (0) ---
> gettimeofday({1157213370, 708405}, NULL) = 0
> gettimeofday({1157213370, 708534}, NULL) = 0
> gettimeofday({1157213370, 708662}, NULL) = 0
> setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 99743}}, NULL) = 0
> sigreturn()                             = ? (mask now [])
> gettimeofday({1157213370, 709043}, NULL) = 0
> select(5, [4], NULL, NULL, {25, 566718}) = ? ERESTARTNOHAND (To be restarted)
> --- SIGALRM (Alarm clock) @ 0 (0) ---
> gettimeofday({1157213370, 812405}, NULL) = 0
> gettimeofday({1157213370, 812535}, NULL) = 0
> gettimeofday({1157213370, 812663}, NULL) = 0
> setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 99742}}, NULL) = 0
> sigreturn()                             = ? (mask now [])
> ....
> 
> so there is some activity all the time. Is this something that can be
> avoided?

I can think of several explanations:

 . The blink-cursor mode uses a timer (that probably explains setitmer
   and SIGALRM)

 . select calls are issued when Emacs enters the idle loop

 . The rest might be because the blink-cursor mode causes signals,
   which then require various system calls, like select, to be
   restarted




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