在“发送垃圾邮件”时提升访问权限：: property_tree :: read_json

Question

I've made a simple TCP Server using Boost Asio (1.53.0). The Server accepts JSON-Requests, parse them with boost::property_tree::read_json .

To test the reliability, I created a simple Application which creates 128 Threads and they send continually Requests.

After a few seconds, the server crashes with an Access Violation:

Unhandled exception at 0x000007FEFD829E5D (KernelBase.dll) in RPC_Server.exe: 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.

msvcr110d.dll!__RethrowException(EHExceptionRecord * pThisException) Line 1217
msvcr110d.dll!__CxxCallCatchBlock(_EXCEPTION_RECORD * pExcept) Line 1279
ntdll.dll!0000000077360c21()
RPC_Server.exe!json::json::Parse(std::basic_string<char,std::char_traits<char>,std::allocator<char> > & sJson) Line 28

Here get's read_json called:

rpc::request json::Parse(std::string sJson)
{
  try {
    std::stringstream ss;
    ss << sJson;
    boost::property_tree::ptree pt;
    boost::property_tree::read_json(ss, pt);
...
}

• If I comment the read_json line out, the server handles everything correctly.
• If I reduce the Test Application to eg just 1 Thread, the server handles and parses everything correctly.

Answer 1

Seems like boost::property_tree::read_json isn't thread-safe by default.

You have to define:

#define BOOST_SPIRIT_THREADSAFE