Accessing file-scope variable from shared library ctor

[Jonathan Wakely]

On 1 June 2013 13:49, Ángel González wrote:
> (You will need to add some locking code if it can be called at the same
> time from several threads)

No you won't:

#include <string>
#include <dlfcn.h>

const std::string& GetPath();

namespace {
std::string reallyGetPath() {
     Dl_info dl_info;
     dladdr((void*)GetPath, &dl_info);
     return dl_info.dli_fname;
}
}

const std::string& GetPath() {
   static const std::string myPath = reallyGetPath();
   return myPath;
}

The compiler adds locking to the initialization of myPath.