the child thread blocks the parent thread.

Question

i don't figure out it.

#include <iostream>
#include <vector>
#include <windows.h>

using namespace std;
void __cdecl Thread(PVOID pvParam)
{
 int a = *(int*) pvParam;
 while ( 1 )
 {
  a ++;
  Sleep(1000);
 }
}

void __cdecl ThreadDis(PVOID pvParam)
{
 while ( 1 )
 {
  cout<<*(int*)pvParam<<endl;  //when it executes
 }

}

void func1()
{
 static int c = 1;
 Thread(&c);
 cout<<c<<endl;   //it will not execute even in a long time
}

void func2()
{
 static int c;
 c = 6;
 ThreadDis(&c);
}

void main()
{
 static int c;
 func1();
 func2();
 cout<<c<<endl;

}

 

Answer 1

If you are saying the static int passed in isn't changing in the parent, it is because you are taking a copy of the int:

 int a = *(int*) pvParam;

Instead take a pointer to it (or reference)

 int* pa = (int*) pvParam;

(*pa)++;

Is this what you mean?

Actually looking at it again, you seem to have different static ints all over the place, try this instead:

void main()
{
 static int c;
 func1(c);
 func2(c);
 cout<<c<<endl;

}

void func1(int& c)

{
 Thread(&c); << - This will block

// _beginthread(Thread,0,(void*)&c); << use this instead, none blocking

  cout << "func1" <<c<<endl;   //it will not execute even in a long time  

}

void func2(int& c)
{
 c = 6;
 ThreadDis(&c);
}

void __cdecl Thread(PVOID pvParam)
{
 int* pa = (int*) pvParam;
 while ( 1 )
 {
  (*pa)++;
  Sleep(1000);
 }

//this will never exit
}

 

void __cdecl ThreadDis(PVOID pvParam)
{
 while ( 1 )
 {
  cout<<(*(int*)pvParam)<<endl;  //when it executes
 }

//this will never exit

}

 

Note: Its early on the first day back after hols, so I'm half asleep still ;)

Answer 2

"the child thread blocks the parent thread"

I do not see any threads in your post.

---

David Wilkinson | Visual C++ MVP