From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 21 Apr 2024 13:54:28 +0200
Subject: Adding upstream version 18.2.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/test/simple_spin.cc | 135 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 src/test/simple_spin.cc

(limited to 'src/test/simple_spin.cc')

diff --git a/src/test/simple_spin.cc b/src/test/simple_spin.cc
new file mode 100644
index 000000000..4afa67074
--- /dev/null
+++ b/src/test/simple_spin.cc
@@ -0,0 +1,135 @@
+
+#include <future>
+
+#include "gtest/gtest.h"
+
+#include "include/spinlock.h"
+
+using ceph::spin_lock;
+using ceph::spin_unlock;
+
+static std::atomic_flag lock = ATOMIC_FLAG_INIT;
+static int64_t counter = 0;
+
+TEST(SimpleSpin, Test0)
+{
+  std::atomic_flag lock0 = ATOMIC_FLAG_INIT;
+  spin_lock(&lock0);
+  spin_unlock(&lock0);
+}
+
+static void* mythread(void *v)
+{
+  for (int j = 0; j < 1000000; ++j) {
+    spin_lock(&lock);
+    counter++;
+    spin_unlock(&lock);
+  }
+  return NULL;
+}
+
+TEST(SimpleSpin, Test1)
+{
+  counter = 0;
+  const auto n = 2000000U;
+
+  int ret;
+  pthread_t thread1;
+  pthread_t thread2;
+  ret = pthread_create(&thread1, NULL, mythread, NULL);
+  ASSERT_EQ(0, ret);
+  ret = pthread_create(&thread2, NULL, mythread, NULL);
+  ASSERT_EQ(0, ret);
+  ret = pthread_join(thread1, NULL);
+  ASSERT_EQ(0, ret);
+  ret = pthread_join(thread2, NULL);
+  ASSERT_EQ(0, ret);
+  ASSERT_EQ(n, counter);
+
+  // Should also work with pass-by-reference:
+  // (Note that we don't care about cross-threading here as-such.)
+  counter = 0;
+  auto f = async(std::launch::async, []() {
+        for(int i = 0; n != i; ++i) {
+            spin_lock(lock);
+            counter++;
+            spin_unlock(lock);
+        }
+       });
+  f.wait();
+  ASSERT_EQ(n, counter);
+}
+
+template <typename LockT>
+int64_t check_lock_unlock(const int64_t n, int64_t& cntr, LockT& lock)
+{
+ auto do_lock_unlock = [&]() -> int64_t {
+        int64_t i = 0;
+
+        for(; n != i; ++i) {
+           spin_lock(lock);
+           cntr++;
+           spin_unlock(lock);
+        }
+
+        return i;
+      };
+
+ auto fone   = async(std::launch::async, do_lock_unlock);
+ auto ftwo   = async(std::launch::async, do_lock_unlock);
+ auto fthree = async(std::launch::async, do_lock_unlock);
+
+ auto one = fone.get();
+ auto two = ftwo.get();
+ auto three = fthree.get();
+
+ // Google test doesn't like us using its macros out of individual tests, so:
+ if(n != one || n != two || n != three)
+  return 0;
+
+ return one + two + three;
+}
+
+TEST(SimpleSpin, Test2)
+{
+ const auto n = 2000000U;
+
+ // ceph::spinlock:
+ {
+ counter = 0;
+ ceph::spinlock l;
+
+ ASSERT_EQ(0, counter);
+ auto result = check_lock_unlock(n, counter, l);
+ ASSERT_NE(0, counter);
+ ASSERT_EQ(counter, result);
+ }
+}
+
+// ceph::spinlock should work with std::lock_guard<>:
+TEST(SimpleSpin, spinlock_guard)
+{
+  const auto n = 2000000U;
+
+  ceph::spinlock sl;
+
+  counter = 0;
+  auto f = async(std::launch::async, [&sl]() {
+        for(int i = 0; n != i; ++i) {
+            std::lock_guard<ceph::spinlock> g(sl);
+            counter++;
+        }
+       });
+
+  auto g = async(std::launch::async, [&sl]() {
+        for(int i = 0; n != i; ++i) {
+            std::lock_guard<ceph::spinlock> g(sl);
+            counter++;
+        }
+       });
+
+  f.wait();
+  g.wait();
+  ASSERT_EQ(2*n, counter);
+}
+
-- 
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