Function non_zero_error_code

src/brpc/socket.h:808–811

_error_code is set after a socket becomes failed, during the time gap, _error_code is 0. The race condition is by-design and acceptable. To always get a non-zero error_code, readers should call this method instead of reading _error_code directly.

    // To always get a non-zero error_code, readers should call this method
    // instead of reading _error_code directly.
    int non_zero_error_code() const {
        const int tmp = _error_code;
        return tmp ? tmp : EFAILEDSOCKET;
    }

    void CancelUnwrittenBytes(size_t bytes);