import(life): Add OS challenges.

4 files changed, 43 insertions, 0 deletions

diff --git a/works/life/operating-system-challenge/1/README.md b/works/life/operating-system-challenge/1/README.md
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+> 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
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diff --git a/works/life/operating-system-challenge/1/main.cpp b/works/life/operating-system-challenge/1/main.cpp
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+// 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
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