Can not find why this is wrong coding.

[jlb]

In the following snippet:

cube_updater ( (void *)rs232_cube)
{
    unsigned char pushcube[CUBE_SIZE][CUBE_SIZE];

    while (1)
    {
        memcpy(pushcube, rs232_cube, CUBE_SIZE*CUBE_SIZE);
        cube_push(pushcube);
    }
}

What is this function going to return? You need to specify the return type.

Next you don't want to surround the void* with parentheses. By using the parentheses you are indicating a cast operation. So this function prototype and function implementation should look like:
void cube_updater( void* rs232_cube)
This saying that this function will not return anything and it takes one parameter (a void pointer).

[NanoGoner]

With this implementation:

line 92 void cube_updater ( (void*) rs232_cube )

I get the following error message:

/home/bruce/Desktop/.../main.c line 92 error: expected declaration specifiers or ‘...’ before ‘(’ token|
||=== Build finished: 1 errors, 0 warnings ===|

When I make jib's change:

Line 92 void cube_updater ( void* rs232_cube )

I get this error message:

/home/bruce/Desktop/.../main.c line 92 error: conflicting types for ‘cube_updater’|
/home/bruce/Desktop/.../cube.h line14 note: previous declaration of ‘cube_updater’ was here|
||=== Build finished: 2 errors, 1 warnings ===|

The declaration in cube.h is:

line 14 void *cube_updater(void* );

If this declaration in cube.h is changed to match the usage in main.c :

line 14 void cube_updater( void* );

The following Linking error is the result:


/home/bruce/Desktop/.../main.c||In function ‘main’:|
/home/bruce/Desktop/.../main.c|31|warning: passing argument 3 of ‘pthread_create’ from incompatible pointer type [enabled by default]|

/usr/include/pthread.h line 225 note: expected ‘void * (*)(void *)’ but argument is of type ‘void (*)(void *)’|

||=== Build finished: 1 errors, 1 warnings ===|



If I change that declaration the code is in conflict withthe implementation in libpthread. I seem to be going around in circles.

[MikeyBoy]

It looks as though jlb assumed that you wanted your function to return nothing. A perfectly natural assumption, since your function doesn't return anything, and doesn't specify a return type!

What that error message is telling you is that your function needs to return a void*, because the pthread library expects that. So you need to give your function that return type in both the prototype and the implementation, and make it return the appropriate pointer.

[NanoGoner]

Thank you all... MikeyBoy led me home.... 0 errors ... Thanks so much for paying forward.

[MikeyBoy]

You're welcome :)