Question

i got a new programing book (multicore programming by cameron hughes, tracey hughes).
so far i have not got one of their programs to work their book says that it should work on 99% of computers so im a little confused but at the end of each program in their book they have “compile and link instructions”… do i need to enter that? it looks something like this “C++ -o guess_it guess_it.cc”. the code im runnning right now is:

#include <iostream>
#include <windows.h>
#include <string>
#include <spawn.h>
#include <sys/wait.h>

using namespace std;

int main(int argc,char *argv[],char *envp[])
{

 pid_t ChildProcess;
 pid_t ChildProcess2;
 int RetCode1;
 int RetCode2;
 int Value;
 RetCode1 = posix_spawn(&ChildProcess,"find_code",NULL,
                        NULL,argv,envp);
 RetCode2 = posix_spawn(&ChildProcess2,"find_code",NULL,
                        NULL,argv,envp);
 wait(&Value);
 wait(&Value);
 return(0);
 }

im running windows 7(32-bit), AMD athion x2 7550 dual-core proessor, VC++ 2008 Express edition.
i get the following error : fatal error C1083: Cannot open include file: ‘spawn.h’: No such file or directory

anyone know why i can’t get my code to run? do i need to download something? because i read the book and did not see anything about downloading anything but i might be wrong. 🙁

Answer 1

It looks like that book is using POSIX threading. Visual Studio uses Windows Threading by default, which has a completely different API.

You most likely just need to get a copy of a POSIX Thread library for Windows. That will include spawn.h and the appropriate lib files for you to use.