static PyObject *
RWLock_func_tryrdlock(RWLock *self)
{
int r;
RAISE_IF_NOT_INITIALIZED(self, NULL);
Py_BEGIN_ALLOW_THREADS
r = uv_rwlock_tryrdlock(&self->uv_rwlock);
Py_END_ALLOW_THREADS
return PyBool_FromLong((long)(r == 0));
}
// https://github.com/thlorenz/libuv-dox/blob/master/methods.md#uv_rwlock_rdlock
void reader_entry(void *n) {
int r;
int num = *(int*)n;
for (int i = 0; i < ROUNDS; i++) {
do {
r = uv_rwlock_tryrdlock(&numlock);
// implementation ./src/unix/thread.c aborts the process unless return value was EBUSY or EAGAIN
// so checking here again is redundant and mainly done for documentation
// fact is that the only r we'd ever get would be EBUSY or EAGAIN (negated)
if (r && r != -EBUSY && r != -EAGAIN) ERROR("obtaining read lock", r);
} while(r);
fprintf(stderr, "Reader %d: aquired lock and shared num = %d\n", num, shared_num);
uv_rwlock_rdunlock(&numlock);
fprintf(stderr, "Reader %d: released lock\n", num);
}
uv_barrier_wait(&blocker);
}
