boost::property_tree::ptree 线程安全吗?

2022-01-12 00:00:00 json thread-safety segmentation-fault c++ boost

我在一段代码的几个线程中使用 boosts read_json.下面是通话的简化细分.我在一个线程(有时是另一个线程)中遇到了段错误，这让我认为 read_json 不是线程安全的(或者我只是以愚蠢的方式使用它)

I'm using boosts read_json in a couple of threads in a piece of code. A simplified breakdown of the call is below. I'm getting segfaults in one of the threads (and sometimes the other) and it's making me think that read_json is not thread safe (Or I'm just using it in a dumb way)

void someclass::dojson() {
   using boost::property_tree::ptree;
   ptree pt;
   std::stringstream ss(json_data_string);

   read_json(ss,pt);
 }

现在两个类之间的 json_data_string 是不同的(它只是通过套接字接收的 json 数据).

Now json_data_string is different between the two classes (it's just json data received over a socket).

那么 read_json 线程安全还是我必须互斥它(而不是)或者有更好的方法来调用 read_json 是线程安全的?

So is read_json thread safe or do I have to mutex it (rather not) or is there a better way of calling read_json that is thread safe?

推荐答案

因为boost json解析器依赖于boost::spirit，而spirit不是线程安全默认的.

Because boost json parser depends on boost::spirit, and spirit is not thread-safety default.

您可以在任何 ptree 头文件之前添加此宏来解决它.

You can add this macro before any ptree header file to resolve it.

#define BOOST_SPIRIT_THREADSAFE
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

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