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[[!meta title="cancellation points are not cancelling threads"]]

[[!tag open_issue_libpthread]]

    #include <pthread.h>
    #include <stdio.h>
    #include <sys/select.h>
    #include <unistd.h>
    
    void *f (void*foo)
    {
        char buf[128];
	//pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
	while (1) {
	    read (0, buf, sizeof(buf));
	}
    }
    int main (void) {
        pthread_t t;
	pthread_create (&t, NULL, f, NULL);
	sleep (1);
	pthread_cancel (t);
	pthread_join (t, NULL);
	exit(0);
    }

read() is not behaving as a cancellation point, only setting the cancel
type to asynchronous permits this testcase to terminate. We do have the
pthread_setcanceltype glibc/libpthread hook in the forward structure, but we are
not using it: the LIBC_CANCEL_ASYNC macros are void, and we're not using them in
the mig msg call either.