Function spin_and_log_trace

test/bthread_unittest.cpp:641–668

#ifdef BRPC_BTHREAD_TRACER
void spin_and_log_trace() {
    bool ok = false;
    for (int i = 0; i < 10; ++i) {
        start = false;
        stop = false;
        bthread_t th;
        ASSERT_EQ(0, bthread_start_urgent(&th, NULL, spin_and_log, (void*)1));
        while (!start) {
            usleep(10 * 1000);
        }

        std::string st1 = bthread::stack_trace(th);
        LOG(INFO) << "spin_and_log stack trace:\n" << st1;
        ok = st1.find("spin_and_log") != std::string::npos;

        stop = true;
        ASSERT_EQ(0, bthread_join(th, NULL));

        std::string st2 = bthread::stack_trace(th);
        LOG(INFO) << "ended bthread stack trace:\n" << st2;
        ASSERT_NE(std::string::npos, st2.find("not exist now"));

        if (ok) {
            break;
        }
    }
    ASSERT_TRUE(ok);
}

void repeated_sleep_trace() {
    bool ok = false;