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c multithreading return-value

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Accepted Answer
March 14, 2026 Score: 10 Rep: 125,267 Quality: Expert Completeness: 70%

The return value is what can be collected when joining the thread:

#include 
#include 
int threadfunc(void* arg) {
    return 123;
}
int main() {
    thrdt thr;
    thrdcreate(&thr, threadfunc, NULL);
    // ...
    int retval;
    if (thrdjoin(thr, &retval) == thrd_success) {
        printf("the thread exited by returning %d\n", retval); // 123
    }
}