Chapter 6: The Hourglass of Lifespan and the Binding of Divine Thought — The Truth Behind I/O Bottlenecks

[Location: Operating Realm · Time Tower · Trial Chamber]

Linus (Li-Nux) brought his disciples to a massive hourglass tower. Countless runes were carved on the tower, each representing the life flow of a process.

“In the Operating Realm, time is not only life but also efficiency.” Linus pointed to the giant hourglass at the top of the tower, “Today, we will practice the **[Lifespan Law] (alarm)** and through a trial, you will understand why some practitioners are as fast as lightning while others are as slow as snails.”

1. The Hourglass of Lifespan: The Only Countdown

Linus flipped his palm, revealing a small hourglass in his hand.

“This treasure is called alarm. Once activated, no matter where you are or what you are doing, it will start the countdown. When the sand runs out, the heavenly law will descend with the 14th Thunder Calamity · Alarm Calamity (SIGALRM), directly taking your life (terminating the process).”

[Law Formula]:

unsigned int alarm(unsigned int seconds);

1. Uniqueness: Each practitioner (process) can only have one hourglass.
2. Overwriting: If you previously set a 5-second hourglass, after 2 seconds, if you set a new 3-second hourglass, the old hourglass will be shattered, and the new 3 seconds will start counting down.
3. Return Value: When you set a new hourglass, it will tell you how many seconds are left in the old hourglass.
4. Longevity Technique: If you want to cancel your death date, just recite alarm(0), and the hourglass will stop immediately.

[Practical Demonstration: The Technique of Extending Life] Linus first set a 5-second hourglass.alarm(5); (Return value: 0, because it was not set before) He leisurely took a sip of tea (sleep for 2 seconds). Suddenly, he gestured again:alarm(3); At this moment, a number appeared in the void:3. “Did you see that? The old hourglass should have had 3 seconds left (5-2), and with this gesture, I not only set a new one but also discovered the remaining time of the old one.”

2. Counting Trial: The Gap Between Mortals and Immortals

“Next, is the highlight of today — Computational Trial.” Linus pointed to two training rooms: “I want you to recite numbers (execute i++) as much as possible within 1 second. After 1 second, the heavenly calamity will descend, and we will see who recited the most.”

Trial Participant One: The Talkative Disciple (I/O Intensive)

This disciple loved to show off, and every time he recited a number, he had to shout it out loud (print to the screen).

/* count_io.c */
int main() {
    alarm(1); // Only 1 second lifespan
    int i = 0;
    while(1) {
        printf("%d\n", i++); // Every calculation, he has to shout
    }
}

Results: The screen scrolled wildly, finally stopping at:194,520. “Hmph, only 190,000?” Linus sneered, “It seems busy, but in reality, it’s all just wasting breath.”

Trial Participant Two: The Ascetic Disciple (CPU Intensive)

This disciple was taciturn, only reciting silently in his mind without making any noise.

/* count_pure.c */
int main() {
    alarm(1);
    int i = 0;
    while(1) {
        i++; // Focused, only cultivating
    }
}

Since he was silent, we could not see the results directly. But Linus summoned the Heavenly Mirror (time command) to shine a light, and everyone was shocked. According to post-event analysis, he recited an astonishing 500 million times in 1 second!

Linus’s Teaching: The Binding of Divine Thought “Why is there such a huge gap? The talkative disciple recited 190,000 times, while the ascetic recited 500 million times, a difference of 2500 times!”

“Because **printf is the divine thought transmission (I/O operation) !” Linus explained: “The speed of the CPU (sea of consciousness) is the speed of light, while the display of the screen (mortal terminal) is as slow as a snail. The talkative disciple spends most of his time not cultivating but waiting for **his mouth to open, the sound to go out, and to be displayed on the screen. This is called I/O Blocking.”

“Conclusion: True masters are all silent. To improve efficiency, talk less (write fewer logs, do less I/O), and do more (perform more calculations)!”

3. Bloodline Inheritance: The Inheritance of the Cloning Technique

At this moment, a disciple asked: “Master, if I use fork() to clone, will my clone inherit my hourglass?”

Linus shook his head and summarized the four major inheritance laws in the cloning technique (fork):

1. Protective Technique (Signal Handling): Inherited. If you practiced the Golden Bell Shield (signal catching), the clone will also have the Golden Bell Shield.
2. Defensive Array (Blocked Signal Set): Inherited. If you block external interference, the clone will also come with the block.
3. Sword of Suspended Judgment (Pending Signal Set): Not Inherited!

• Explanation: If you have a thunder (pending signal) hanging over your head, when you clone, the clone is clean, with no thunder above. The heavenly law has its own principles; it will not implicate the innocent.

4. Hourglass of Lifespan (alarm): Not Inherited!

• Explanation: Your death date is your own. The clone, upon birth, has an infinite lifespan (no alarm), unless it decides to set one itself.

[Verification Array] Linus set a 5-second hourglass and then cloned. As soon as the clone was born, it immediately checked:alarm(0). The result returned 0. “Look, the clone did not inherit my 5-second countdown. It is free.” Meanwhile, Linus’s original body was struck by lightning after 5 seconds.

4. Conclusion of Enlightenment

Linus was reborn from the ruins, brushing off the dust from his clothes.

“What we learned today is the foundation of cultivation:”

1. alarm is a one-time consumable and also an overwriting item.
2. I/O operations are black holes that consume efficiency; use printf with caution.
3. After Fork, although the clone resembles you, in terms of life and death (alarm) and karma (pending), it is independent.

“In the next chapter, we will enter a more intricate realm — how to use signal sets (sigset_t) to construct a foolproof defense system, allowing specific calamities to descend only at specific times.”

(Chapter 6 Complete)