From: Daniel Berger <djberg96@...>
Date: 2010-12-06T01:11:58+09:00
Subject: Re: How to tell if ruby app is already running



On Dec 5, 5:13 am, Jim Burgess <jack.ze...@gmail.com> wrote:
> Hi,
>
> Thanks very much for the replies.
>
> I tried to install the posixlock gem, but got the following error
> message:
>
> C:/Ruby187/bin/ruby.exe extconf.rb
> creating Makefile
>
> make
> gcc -I. -I/C/Ruby187/lib/ruby/1.8/i386-mingw32
> -I/C/Ruby187/lib/ruby/1.8/i386-mingw32 -I.   -g -O2 -DFD_SETSIZE=256
> -c posixlock.c
> posixlock.c:2:26: missing/file.h: No such file or directory
> posixlock.c: In function `posixlock':
> posixlock.c:82: error: storage size of 'lock' isn't known
> posixlock.c:87: error: `F_RDLCK' undeclared (first use in this function)
> posixlock.c:87: error: (Each undeclared identifier is reported only once
> posixlock.c:87: error: for each function it appears in.)
> posixlock.c:90: error: `F_WRLCK' undeclared (first use in this function)
> posixlock.c:93: error: `F_UNLCK' undeclared (first use in this function)
> posixlock.c:101: error: `F_SETLK' undeclared (first use in this
> function)
> posixlock.c:101: error: `F_SETLKW' undeclared (first use in this
> function)
> posixlock.c: In function `rb_file_lockf':
> posixlock.c:160: error: storage size of 'lock' isn't known
> posixlock.c:183: error: `F_WRLCK' undeclared (first use in this
> function)
> posixlock.c:184: error: `F_SETLKW' undeclared (first use in this
> function)
> posixlock.c:187: error: `F_RDLCK' undeclared (first use in this
> function)
> posixlock.c:192: error: `F_SETLK' undeclared (first use in this
> function)
> posixlock.c:199: error: `F_UNLCK' undeclared (first use in this
> function)
> posixlock.c:205: error: `F_GETLK' undeclared (first use in this
> function)
> make.exe: *** [posixlock.o] Error 1
>
> I spent ages googling for a solution, but came up empty handed.

I did not realize you were on Windows. I think it could be made to
work on Windows, though. But, you can still use this even on Windows
without resorting to a 3rd party gem, as per the link to the original
discussion:

DATA.flock(File::LOCK_EX)

> I then tried implementing Phillip's suggestion and that achieved exactly
> what I had hoped.

gem install pidfile :)

Regards,

Dan