Working directory in thread

[Xiangrong Fang]

Hi

I have a question using Dir.chdir. Is the current working directory for
a program unique to thread or to the program? My multithread program is
experiencing problems. It seems that a Dir.chdir in one thread changed
the working directory of another thread. Is there a "thread-safe" chdir?

Thanks!

 

[Hal E. Fulton]

----- Original Message -----
From: "Xiangrong Fang" <[email protected]>
To: "ruby-talk ML" <[email protected]>
Sent: Wednesday, August 06, 2003 10:49 PM
Subject: Working directory in thread

I have a question using Dir.chdir. Is the current working directory for
a program unique to thread or to the program? My multithread program is
experiencing problems. It seems that a Dir.chdir in one thread changed
the working directory of another thread. Is there a "thread-safe" chdir?

An OS issue. The notion of the current directory
is per-process.

Not possible to do what you want *unless* you
support it yourself... e.g., do some syncing at
the same time you change dirs.

mutex.synchronize do
Dir.chdir(newdir) do
# code...
end
end

But if you were going to do that, it might be
almost as easy just to keep the dir info for
each thread and stick it on the front of each
filename or whatever.

Hal

 

[nobu.nokada]

Hi,

At Thu, 7 Aug 2003 12:49:31 +0900,

I have a question using Dir.chdir. Is the current working directory for
a program unique to thread or to the program? My multithread program is
experiencing problems. It seems that a Dir.chdir in one thread changed
the working directory of another thread. Is there a "thread-safe" chdir?

CWD is a process resource. There is no "thread-safe" way, in
general.