[libc++][test] Fix race condition in condition_variable_any tests

[huixie90]

Some tests in condition_variable_any use two shared_lock to guard, which does not work.
The fix is to make the writer to use unique_lock

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Hui (huixie90)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/84788.diff

3 Files Affected:

• (modified) libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_token_pred.pass.cpp (+1-1)
• (modified) libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_token_pred.pass.cpp (+1-1)
• (modified) libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_token_pred.pass.cpp (+1-1)

diff --git a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_token_pred.pass.cpp b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_token_pred.pass.cpp
index 4ea60557d9f88c..7a39d1253a33cf 100644
--- a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_token_pred.pass.cpp
+++ b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_token_pred.pass.cpp
@@ -119,7 +119,7 @@ void test() {
     bool flag   = false;
     auto thread = support::make_test_thread([&]() {
       std::this_thread::sleep_for(2ms);
-      Lock lock2{mutex};
+      std::unique_lock<Mutex> lock2{mutex};
       flag = true;
       cv.notify_all();
     });
diff --git a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_token_pred.pass.cpp b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_token_pred.pass.cpp
index e96a3e8bd1bc0b..f322d8cfdc68fc 100644
--- a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_token_pred.pass.cpp
+++ b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_token_pred.pass.cpp
@@ -63,7 +63,7 @@ void test() {
     bool flag   = false;
     auto thread = support::make_test_thread([&]() {
       std::this_thread::sleep_for(std::chrono::milliseconds(2));
-      Lock lock2{mutex};
+      std::unique_lock<Mutex> lock2{mutex};
       flag = true;
       cv.notify_all();
     });
diff --git a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_token_pred.pass.cpp b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_token_pred.pass.cpp
index d649db025d755d..e7388b9ce0e176 100644
--- a/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_token_pred.pass.cpp
+++ b/libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_token_pred.pass.cpp
@@ -119,7 +119,7 @@ void test() {
     bool flag   = false;
     auto thread = support::make_test_thread([&]() {
       std::this_thread::sleep_for(std::chrono::milliseconds(2));
-      Lock lock2{mutex};
+      std::unique_lock<Mutex> lock2{mutex};
       flag = true;
       cv.notify_all();
     });

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