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Comment: Sorted functions in example to remove a prototype.
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| int TestThread(void *ptr); | // 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; } |
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// 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; } |
SDL_GetThreadID
Use this function to get the thread identifier for the specified thread.
Contents
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"
// 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;
}
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 0;
}
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.
