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std::ofstream threadsafe?

Started by Austrian Coder Oct 9, 2004 at 9:35 AM 2 replies 4.4k views

Original Post

Oct 9, 2004 at 9:35 AM

Hi. I am working on a programm, which uses a std::ofstream based loger class. Now i need to know, if std::ofstream is threadsafe on windows and linux. Thanks, Christian

twanvl

Oct 9, 2004 at 9:47 AM

There are many ways a program can be thread safe, what do you mean exactly?
IIRC ostream is usually not thread safe, i.e.:

// thread astream << "test";// thread bstream << "test";

might output "tteesstt".

antareus

Oct 9, 2004 at 10:53 AM

Don't assume that it is because the standard says nothing about thread-safety.

Evil Steve

Oct 9, 2004 at 11:03 AM

Wrap the part of your logger that writes to the file in a mutex. It shouldn't be much effort, just 4 calls (InitializeCriticalSection(), DeleteCriticalSection(), EnterCriticalSection(), LeaveCriticalSection())

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