Re: std::ifstream multithread

From:

Victor Bazarov <v.bazarov@comcast.invalid>

Newsgroups:

comp.lang.c++

Date:

Fri, 27 May 2011 09:19:31 -0400

Message-ID:

<iro8d3$pbb$1@dont-email.me>

On 5/27/2011 9:04 AM, Philipp Kraus wrote:

On 2011-05-27 14:31:05 +0200, Victor Bazarov said:

On 5/27/2011 6:22 AM, Philipp Kraus wrote:

I must read a lot of files like this

std::ifstream l_file;

l_file.open(p_str1.c_str(), std::ifstream::binary);
std::copy( std::istream_iterator<char>(l_file),
std::istream_iterator<char>(),
std::ostreambuf_iterator<char>(&l_deflate) );
l_file.close();

I deflate the file content with bzip. I would do this in a multithread
content, so my question is, can I do this without any problems during
reading?
In some cases two thread can use the same file (p_str1 is in two threads
equal). Can i read the same file out of two thread or is a mutex
required?

You need to consult your compiler and/or standard library manual.

I use g++ and Visual Studio, du you know anything about it? In my option
the OS should be manage the access to the files.

Sorry, specific compilers are discussed in their specific newsgroups. A
particular OS is discussed in its newsgroup. Use the right venue for
your inquiries, OK? Or just google.

V
--
I do not respond to top-posted replies, please don't ask