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Use this function to get the thread identifier for the specified thread.


SDL_threadID SDL_GetThreadID(SDL_Thread* thread)

Function Parameters


the thread to query

Return Value

Returns the ID of the specified thread, or the ID of the current thread if thread is NULL.

Code Examples

#include <stdio.h>
#include "SDL.h"

// 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);

    return cnt;

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

    printf("\nSimple SDL_CreateThread test:");

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

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

    /* Retrieve the ID for the newly launched thread */
    threadID = SDL_GetThreadID(thread);

    /* Wait for the thread to complete and get the return code */
    SDL_WaitThread(thread, &threadReturnValue);
    printf("\nThread returned value: %d", threadReturnValue);

    return 0;


This thread identifier is as reported by the underlying operating system. If SDL is running on a platform that does not support threads the return value will always be zero.

CategoryAPI, CategoryThread

None: SDL_GetThreadID (last edited 2017-03-11 22:48:55 by PhilippWiesemann)

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