Boost.Asio thread safety

问题

Is it safe to call async_write & async_read from different threads in situation when io_service::run() was called from only one thread? Thank you!

回答1:

Is it safe to call async_write & async_read from different threads

Yes, but with a caveat. You can safely do this for distinct socket objects

Thread Safety

Distinct objects: Safe.

Shared objects: Unsafe.

回答2:

The documentation is conservative on that and says "no".

But I'm doing this anyway in one of my linux programs and it seems to work fine. Digging into boost/asio/detail/epoll_reactor.ipp shows that the function start_op() is indeed protected by a mutex, so my confidence is increased.

But other platforms may be different..

来源：https://stackoverflow.com/questions/7639349/boost-asio-thread-safety