CODEWITHSUNDEEP
c++pthreadsstdthread
GhostRavenstorm
GhostRavenstorm

Reputation: 754

Is there an std::thread_create like pthread_create?

I'm working a project here trying to port some Linux C++ code to be cross platform, and I have here a wrapper thread class that's using pthread. 

#include <pthread.h>

class ServerThread {
public:
   pthread_t tid;
   pthread_mutex_t mutex;
   int Create (void* callback, void* args);
};

I'm trying to port this directly to std::thread but the Create method here uses pthread_create which I understand starts the thread, but I'm unable to find the std equivalent.

int ServerThread :: Create (void* callback, void* args) {
   int tret = 0;
   tret = pthread_create(&this->tid, nullptr, (void*(*)(void *)) callback, args);
   if (tret != 0) {
      std::cerr << "Error creating thread." << std::endl;
      return tret;
   }

   return 0;
}

I genuinely don't understand what I'm looking at with that pthread_create function call. Is that some kind of strange void pointer double cast?

I have no documentation with the code base I'm working with, so my guess is as good as the next guys'.

Upvotes: 0

Views: 1183

Answers (1)

walnut
walnut

Reputation: 22152

std::thread's constructor will start the new thread with the function and arguments provided.

So roughly:

void thread_func(int, double) {
}

class ServerThread {

    std::thread thr;

    ServerThread(int arg1, double arg2)
      : thr(thread_func, arg1, arg2) {
    }

};

If you want to run the thread later after the construction, you can first default-initialize std::thread, which will not start an actual thread, and then you can move a new std::thread instance with started thread into it later:

class ServerThread {

    std::thread thr;

    ServerThread() : thr() {
    }

    void StartThread(int arg1, double arg2) {
        thr = std::thread(thread_func, arg1, arg2);
    }

};

Upvotes: 3

Related Questions