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Revision 13 as of 2013-12-07 14:38:35

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SDL_GetThreadID

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

Syntax

SDL_threadID SDL_GetThreadID(SDL_Thread* thread)

Function Parameters

thread

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_thread.h"
#include "SDL_timer.h"

int TestThread(void *ptr);

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());
        exit(-1);
    }

    // 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 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 cnt;
}

Remarks

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

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