From ac32eebb6cad203e7a45834d3dc90b639e3d6ed3 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Fri, 19 Mar 2021 14:27:01 +0800
Subject: import(life): Finish OS challenge 2.

---
 works/life/operating-system-challenge/2/README.md  |   5 ++
 works/life/operating-system-challenge/2/effect.png | Bin 0 -> 179599 bytes
 works/life/operating-system-challenge/2/main.cpp   |  73 +++++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 works/life/operating-system-challenge/2/effect.png
 create mode 100644 works/life/operating-system-challenge/2/main.cpp

(limited to 'works/life/operating-system-challenge/2')

diff --git a/works/life/operating-system-challenge/2/README.md b/works/life/operating-system-challenge/2/README.md
index e8316ad..86672f5 100644
--- a/works/life/operating-system-challenge/2/README.md
+++ b/works/life/operating-system-challenge/2/README.md
@@ -3,3 +3,8 @@
 > ![sample](sample.jpg)
 
 Translation: Write a program and make each core of your CPU get a different but regular usage rate graph.
+
+Code is in `main.cpp`. Remember to not compile it with O2 optimization, or my loop will be eliminated.
+
+Final effect:
+![effect](effect.png)
diff --git a/works/life/operating-system-challenge/2/effect.png b/works/life/operating-system-challenge/2/effect.png
new file mode 100644
index 0000000..984a3da
Binary files /dev/null and b/works/life/operating-system-challenge/2/effect.png differ
diff --git a/works/life/operating-system-challenge/2/main.cpp b/works/life/operating-system-challenge/2/main.cpp
new file mode 100644
index 0000000..a497442
--- /dev/null
+++ b/works/life/operating-system-challenge/2/main.cpp
@@ -0,0 +1,73 @@
+#include <Windows.h>
+#include <cmath>
+
+DWORD WINAPI Thread1(_In_ LPVOID lpParameter) {
+  int i;
+  while (true) {
+    i++;
+  }
+  return 0;
+}
+
+DWORD WINAPI Thread2(_In_ LPVOID lpParameter) {
+  while (true) {
+    for (long long i = 0; i < 5000000000; i++)
+      ;
+    Sleep(10000);
+  }
+
+  return 0;
+}
+
+DWORD WINAPI Thread3(_In_ LPVOID lpParameter) {
+  while (true) {
+    for (int i = 0; i < 4000000; i++)
+      ;
+    Sleep(10);
+  }
+
+  return 0;
+}
+
+DWORD WINAPI Thread4(_In_ LPVOID lpParameter) {
+  LARGE_INTEGER frequency;
+  QueryPerformanceFrequency(&frequency);
+
+  LARGE_INTEGER count;
+  QueryPerformanceCounter(&count);
+
+  double current_y = 0;
+
+  while (true) {
+    for (int i = 0; i < 3000000.0 * (1.0 + current_y); i++)
+      ;
+    Sleep(10 * (1 - current_y));
+
+    LARGE_INTEGER new_count;
+    QueryPerformanceCounter(&new_count);
+
+    auto s = (new_count.QuadPart - count.QuadPart) / frequency.QuadPart;
+    current_y = std::sin(s / 30.0 * 2 * 3.1415926535) * 0.6;
+  }
+
+  return 0;
+}
+
+int main() {
+  HANDLE thread1 = CreateThread(NULL, 0, Thread1, NULL, 0, NULL);
+  HANDLE thread2 = CreateThread(NULL, 0, Thread2, NULL, 0, NULL);
+  HANDLE thread3 = CreateThread(NULL, 0, Thread3, NULL, 0, NULL);
+  HANDLE thread4 = CreateThread(NULL, 0, Thread4, NULL, 0, NULL);
+
+  SetThreadAffinityMask(thread1, 1);
+  SetThreadAffinityMask(thread2, 1 << 1);
+  SetThreadAffinityMask(thread3, 1 << 2);
+  SetThreadAffinityMask(thread4, 1 << 3);
+
+  WaitForSingleObject(thread1, INFINITE);
+  WaitForSingleObject(thread2, INFINITE);
+  WaitForSingleObject(thread3, INFINITE);
+  WaitForSingleObject(thread4, INFINITE);
+
+  return 0;
+}
-- 
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