dev/cpp/multithreading/pthread_cancel.cpp

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#include <pthread.h>
#include <sched.h>
#include <stdio.h>
extern "C" void thr_yield(void);
void thr_yield(void)
{
printf("thr_yield() called\n");
}
//extern "C" void printf(...);
struct X {
int x;
X(int i) {
x = i;
printf("X(%d) constructed.\n", i);
}
~X() {
printf("X(%d) destroyed.\n", x);
}
};
void
free_res(void *i)
{
printf("Freeing `%d`\n", i);
}
char *f2(int i)
{
try {
X dummy(i);
pthread_cleanup_push(free_res, (void *)i);
if (i == 50) {
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
pthread_testcancel();
}
f2(i + 1);
pthread_cleanup_pop(0);
} catch (int) {
printf("Error: In handler.\n");
}
return "f2";
}
void *
thread2(void *tid)
{
void *sts;
printf("I am new thread :%d\n", pthread_self());
pthread_cancel((pthread_t)tid);
pthread_join((pthread_t)tid, &sts);
printf("main thread cancelled due to %d\n", sts);
return (sts);
}
main()
{
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
pthread_create(NULL, NULL, thread2, (void *)pthread_self());
thr_yield();
printf("Returned from %s\n", f2(0));
}