From ec72d12002c6d3b707a014645c0da1b397dc7ee4 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 17 Mar 2021 17:15:19 +0800
Subject: import(life): Add OS challenges.

---
 works/life/operating-system-challenge/.gitignore   |   1 +
 works/life/operating-system-challenge/1/README.md  |  10 +++++++
 works/life/operating-system-challenge/1/effect.png | Bin 0 -> 136979 bytes
 works/life/operating-system-challenge/1/main.cpp   |  33 +++++++++++++++++++++
 works/life/operating-system-challenge/1/sample.jpg | Bin 0 -> 125777 bytes
 works/life/operating-system-challenge/2/README.md  |   5 ++++
 works/life/operating-system-challenge/2/sample.jpg | Bin 0 -> 82879 bytes
 works/life/operating-system-challenge/README.md    |   1 +
 8 files changed, 50 insertions(+)
 create mode 100644 works/life/operating-system-challenge/.gitignore
 create mode 100644 works/life/operating-system-challenge/1/README.md
 create mode 100644 works/life/operating-system-challenge/1/effect.png
 create mode 100644 works/life/operating-system-challenge/1/main.cpp
 create mode 100644 works/life/operating-system-challenge/1/sample.jpg
 create mode 100644 works/life/operating-system-challenge/2/README.md
 create mode 100644 works/life/operating-system-challenge/2/sample.jpg
 create mode 100644 works/life/operating-system-challenge/README.md

(limited to 'works/life/operating-system-challenge')

diff --git a/works/life/operating-system-challenge/.gitignore b/works/life/operating-system-challenge/.gitignore
new file mode 100644
index 0000000..1feae78
--- /dev/null
+++ b/works/life/operating-system-challenge/.gitignore
@@ -0,0 +1 @@
+*.exe
diff --git a/works/life/operating-system-challenge/1/README.md b/works/life/operating-system-challenge/1/README.md
new file mode 100644
index 0000000..2088658
--- /dev/null
+++ b/works/life/operating-system-challenge/1/README.md
@@ -0,0 +1,10 @@
+> 挑战一：写一个程序，运行该进程时，你的电脑整体 CPU 利用率保持在 100%
+> 示例效果如
+> ![sample](sample.jpg)
+
+Transaltion: Write a program and make your CPU's usage rate 100%.
+
+Code is in `main.cpp`. Remember to not compile it with O2 optimization, or my dead cycle will be eliminated.
+
+Final effect:
+![effect](effect.png)
diff --git a/works/life/operating-system-challenge/1/effect.png b/works/life/operating-system-challenge/1/effect.png
new file mode 100644
index 0000000..b173ea0
Binary files /dev/null and b/works/life/operating-system-challenge/1/effect.png differ
diff --git a/works/life/operating-system-challenge/1/main.cpp b/works/life/operating-system-challenge/1/main.cpp
new file mode 100644
index 0000000..0f780ef
--- /dev/null
+++ b/works/life/operating-system-challenge/1/main.cpp
@@ -0,0 +1,33 @@
+// Remember not to use O2 optimization!
+
+#include <thread>
+#include <vector>
+
+int main() {
+  std::vector<std::thread> threads;
+
+  // Because my CPU has 4-core and 8-threads. I open 8 threads.
+  for (int i = 0; i < 8; i++) {
+    std::thread t([] {
+      int i;
+      int j;
+      int k;
+      double d;
+      while (true) {
+        i = i + i;
+        j = j - j;
+        k = k * k;
+        d = d + d;
+        i = i & i;
+        j = j | j;
+      }
+    });
+    threads.push_back(std::move(t));
+  }
+
+  for (auto &t : threads) {
+    t.join();
+  }
+
+  return 0;
+}
diff --git a/works/life/operating-system-challenge/1/sample.jpg b/works/life/operating-system-challenge/1/sample.jpg
new file mode 100644
index 0000000..7276bec
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diff --git a/works/life/operating-system-challenge/2/README.md b/works/life/operating-system-challenge/2/README.md
new file mode 100644
index 0000000..e8316ad
--- /dev/null
+++ b/works/life/operating-system-challenge/2/README.md
@@ -0,0 +1,5 @@
+> 挑战二：写一个程序，运行该进程时，你计算机每一个核的 CPU 占用率是各不相同的有规律的曲线
+> 示例效果如：
+> ![sample](sample.jpg)
+
+Translation: Write a program and make each core of your CPU get a different but regular usage rate graph.
diff --git a/works/life/operating-system-challenge/2/sample.jpg b/works/life/operating-system-challenge/2/sample.jpg
new file mode 100644
index 0000000..53b9f89
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diff --git a/works/life/operating-system-challenge/README.md b/works/life/operating-system-challenge/README.md
new file mode 100644
index 0000000..8a5898d
--- /dev/null
+++ b/works/life/operating-system-challenge/README.md
@@ -0,0 +1 @@
+Some challenges raised by my Operating System teacher, aka. Li Hao.
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