Simple pthread C

Question

I have no idea why this doesn t work   include  lt iostream gt   include  lt pthread h gt  using namespace std   void  print message         cout  lt  lt   Threading n        int main          pthread t t1       pthread create  amp t1  NULL   amp print message  NULL       cout  lt  lt   Hello        return 0      The error       Description  Resource  Path  Location  Type  initializing argument 3   of  int pthread create pthread t   const pthread attr t   void        void    void    threading cpp   threading src   line 24 C C     Problem

User · Answer

When compiling with G    remember to put the -lpthread flag

User · Answer

Linkage  Try this   extern  C  void  print message

User · Answer

Because the main thread exits   Put a sleep in the main thread   cout  lt  lt   Hello   sleep 1    return 0    The POSIX standard does not specify what happens when the main thread exits  But in most implementations this will cause all spawned threads to die     So in the main thread you should wait for the thread to die before you exit  In this case the simplest solution is just to sleep and give the other thread a chance to execute  In real code you would use pthread join      include  lt iostream gt   include  lt pthread h gt  using namespace std    if defined   cplusplus  extern  C   endif void  print message void         cout  lt  lt   Threading n        int main          pthread t t1       pthread create  amp t1  NULL   amp print message  NULL       cout  lt  lt   Hello        void  result      pthread join t1  amp result        return 0

User · Answer

This worked for me    include  lt iostream gt   include  lt pthread h gt  using namespace std   void  print message void          cout  lt  lt   Threading n      int main          pthread t t1       pthread create  amp t1  NULL   amp print message  NULL       cout  lt  lt   Hello           Optional      void  result      pthread join t1  amp result                  return 0

User · Answer

From the pthread function prototype   int pthread create pthread t  thread  const pthread attr t  attr      void    start routine  void    void  arg     The function passed to pthread create must have a prototype of   void  name void  arg

User · Answer

You should declare the thread main as   void  print message void      takes one parameter  unnamed if you aren t using it

[c++] Simple pthread! C++

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