John (Eljay) Love-Jensen wrote:
> Hi Mohsen,
>
> Your inquiry is off topic for this forum. I do not say this to chastize you. I say it because you may get better / faster / more accurate information from a more appropriate forum that is pthread savvy.
>
> There are a whole bunch of errors in your test source code.
>
> For example, the pthread_create's third parameter takes a function pointer to a function that looks like:
>
> void* task(void* ptr);
>
> You are passing in a function pointer to a function that looks like:
>
> void task(int* counter);
>
> And you are casting the function pointer to a data pointer:
>
> (void*)task1
>
> That doesn't fit.
>
> Another example, pthread_create's first parameter takes a pointer to a pthread_t. You are passing in a poiter to a pointer to a pthread_t. (And that pointer-to-a-pointer has not been allocated anywhere.)
>
> That doesn't fit.
>
> Work through all the mismatched data types, and then see where things end up. GCC helps you, by emitting a lot of warnings and errors. Heed them.
>
> Don't forget to:
>
> gcc test.c -lpthread
>
> HTH,
> --Eljay
You might want to define your task functions to have the type expected
by phtread_create instead of casting them, something like;
void *task1(void *p)
{
int *counter=(int *)p;
while(*counter < 5 ){
printf("task1 count: %d\n",*counter);
(*counter)++;
}
return NULL;
}
The type system is there to help you, dont cast things unless you really
need to.
