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Revision 9 as of 2012-08-06 10:11:09

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SDL_WaitThread

Use this function to wait for a thread to finish. As a side effect, the function will free the memory allocated to the SDL_Thread structure.

Syntax

void SDL_WaitThread(SDL_Thread* thread,
                    int*        status)

Function Parameters

thread

The SDL_Thread pointer that was returned from the SDL_CreateThread call that started this thread. Note that the pointer becomes invalid after SDL_WaitThread finishes, because this function will free the memory pointed to.

status

Pointer to an integer that will receive the value returned from the thread function by its 'return', see Remarks for details

Code Examples

Toggle line numbers

#include <stdio.h>
#include <SDL_thread.h>
#include <SDL_timer.h>

int TestThread( void *ptr );

int main(int argc, char *argv[])
{
        SDL_Thread *thread;
        int         threadReturnValue;

        printf("\nSimple SDL_CreateThread test:");

        // Simply create a thread
        thread = SDL_CreateThread( TestThread, (void *)NULL);

        if( NULL == thread )
           printf("\nSDL_CreateThread failed: %s\n", SDL_GetError());
        else
        {

           // Wait for the thread to complete. The thread functions return code will
           //       be placed in the "threadReturnValue" variable when it completes.
           //
           SDL_WaitThread( thread, &threadReturnValue);
           printf("\nThread returned value:%d", threadReturnValue);
        }

        return 1;
}

// Very simple thread - counts 0 to 9 delaying 50ms between increments
int TestThread( void *ptr )
{
        int        cnt;

        for(cnt=0;cnt<10;cnt++)
        {
                printf( "\nThread counter: %d", cnt);
                SDL_Delay(50);
        }

        // Return the final value to the SDL_WaitThread function above
        return cnt;
}

Remarks

The return code for the thread function is placed in the area pointed to by status, if status is not NULL. The return code is the value returned by the 'return' call in the thread function. This can be a 'status' on the thread, or the result of a computation the thread was created to perform.


CategoryAPI, CategoryThread

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