File locking in C++

[barcaroller]

I am familiar with file locking in C (flock, fcntl) but I was unable to
find anything similar in C++ (using either fstream or
boost::filesystem). Does anyone know if the C++ libraries support file
locking?

Thanks much.

 

[Richard]

[Please do not mail me a copy of your followup]

barcaroller <[email protected]> spake the secret code

I am familiar with file locking in C (flock, fcntl) but I was unable to
find anything similar in C++ (using either fstream or
boost::filesystem). Does anyone know if the C++ libraries support file
locking?

<http://www.boost.org/doc/libs/1_44_...rprocess.synchronization_mechanisms.file_lock>

google is your friend>

 

[barcaroller]

<http://www.boost.org/doc/libs/1_44_...rprocess.synchronization_mechanisms.file_lock>

google

is your friend>

I've googled "C++ file locking" and similar phrases. Try it, and
you'll see what I mean. Your link is exactly what I was looking for.
Thank you.

 

[Goran]

I am familiar with file locking in C (flock, fcntl)

I have no idea what flock and fnctl are. And I just looked upon C99
draft, there's no mention of neither. My conclusion is: there is
__no__ file locking in C (that is, in C standard library).

More seriously, you are looking for things that seem to be outside of
the scope of the language. fnctl, in particular, is part of POSIX
spec. But you can, of course, call that from your C++ code.

Goran.

 

[James Kanze]

I am familiar with file locking in C (flock, fcntl) but I was unable to
find anything similar in C++ (using either fstream or
boost::filesystem). Does anyone know if the C++ libraries support file
locking?

Neither C nor C++ support file locking. In general, support for
anything more than a simple sequential stream is very limited.
More complex operations have to descend to the system level
(different in Windows and Posix), and use it. (Your functions
flock and fcntl are Posix, not C, and are probably not available
under Windows.)

 

[Richard]

[Please do not mail me a copy of your followup]

barcaroller <[email protected]> spake the secret code

I've googled "C++ file locking" and similar phrases. Try it, and
you'll see what I mean. Your link is exactly what I was looking for.
Thank you.

I googled "boost file lock". In general, I've found that "C++" isn't
a good term for google.

Its a bit like searching for my favorite band: "The Who". Many search
engines discard both terms because they "appear too frequently".
Google isn't as bad this way, but there was a point when you couldn't
find anything at all on this megaband simply because search engines
were stupid.

 

[osmium]

[Please do not mail me a copy of your followup]

barcaroller <[email protected]> spake the secret code

I've googled "C++ file locking" and similar phrases. Try it, and
you'll see what I mean. Your link is exactly what I was looking for.
Thank you.

I googled "boost file lock". In general, I've found that "C++" isn't
a good term for google.

Its a bit like searching for my favorite band: "The Who".

Google gives better results if one uses quotation marks, i.e. search
for '"C++" file lock' rather than 'C++ file lock'.

I get 2.1e6 hits for
C++ file lock
and i get 2.1e6 hits for
"C++" file lock
which is just as I expected.
Perhaps there is a bettter language way to express what you meant? Maybe
using < stuff> angle brackets, that is,
or a fresh line as I hope I have done here.

 

[osmium]

[Please do not mail me a copy of your followup]

barcaroller <[email protected]> spake the secret code
<[email protected]> thusly:

I've googled "C++ file locking" and similar phrases. Try it, and
you'll see what I mean. Your link is exactly what I was looking for.
Thank you.

I googled "boost file lock". In general, I've found that "C++" isn't
a good term for google.

Its a bit like searching for my favorite band: "The Who".

Google gives better results if one uses quotation marks, i.e. search
for '"C++" file lock' rather than 'C++ file lock'.

I get 2.1e6 hits for
C++ file lock
and i get 2.1e6 hits for
"C++" file lock
which is just as I expected.
Perhaps there is a bettter language way to express what you meant? Maybe
using < stuff> angle brackets, that is,
or a fresh line as I hope I have done here.

language was meant to be meta-langauge

 

[Richard]

[Please do not mail me a copy of your followup]

"osmium" <[email protected]> spake the secret code

I get 2.1e6 hits for
C++ file lock

....which is why C++ isn't a good search term. It returns too many results.