From 6dbf014773f5f8ac0b0e291392dfde518de94daf Mon Sep 17 00:00:00 2001
From: johannst <johannst@users.noreply.github.com>
Date: Tue, 23 Jan 2024 01:39:29 +0000
Subject: deploy: 8c9fd06e839c06717dd2dcb067371a5e1fc71801

---
 trace_profile/callgrind/cg_example.cc | 36 +++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 trace_profile/callgrind/cg_example.cc

(limited to 'trace_profile/callgrind/cg_example.cc')

diff --git a/trace_profile/callgrind/cg_example.cc b/trace_profile/callgrind/cg_example.cc
new file mode 100644
index 0000000..d143790
--- /dev/null
+++ b/trace_profile/callgrind/cg_example.cc
@@ -0,0 +1,36 @@
+#include <cstdio>
+#include <thread>
+
+#include <valgrind/callgrind.h>
+
+struct cnt {
+  volatile int a;
+  volatile int b;
+};
+
+void inc_a(cnt &c) { c.a++; }
+void inc_b(cnt &c) { c.b++; }
+
+int main() {
+  cnt C{0, 0};
+
+  CALLGRIND_START_INSTRUMENTATION;
+
+  std::thread T1([&C]() {
+    for (int i = 0; i < 20000000; ++i) {
+      inc_a(C);
+    }
+  });
+  std::thread T2([&C]() {
+    for (int i = 0; i < 10000000; ++i) {
+      inc_b(C);
+    }
+  });
+  T1.join();
+  T2.join();
+
+  CALLGRIND_STOP_INSTRUMENTATION;
+
+  printf("%d %d\n", C.a, C.b);
+  return 0;
+}
-- 
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