[libc-commits] [libc] [libc][mutex] add error checking support (PR #197035)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- libc/include/llvm-libc-macros/pthread-macros.h libc/include/llvm-libc-types/__mutex_type.h libc/src/__support/threads/mutex.h libc/src/__support/threads/mutex_common.h libc/src/__support/threads/unix_mutex.h libc/src/pthread/pthread_mutex_init.cpp libc/src/pthread/pthread_mutex_lock.cpp libc/src/pthread/pthread_mutex_trylock.cpp libc/src/pthread/pthread_mutex_unlock.cpp libc/test/integration/src/pthread/pthread_mutex_test.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libc/src/__support/threads/unix_mutex.h b/libc/src/__support/threads/unix_mutex.h
index 9306ec48e..272a1dfe6 100644
--- a/libc/src/__support/threads/unix_mutex.h
+++ b/libc/src/__support/threads/unix_mutex.h
@@ -47,8 +47,7 @@ class Mutex final : private RawMutex {
         return MutexError::OVERFLOW;
       lock_count++;
       return MutexError::NONE;
-    }
-    else if (is_error_checking() && owner == internal::gettid())
+    } else if (is_error_checking() && owner == internal::gettid())
       return MutexError::DEADLOCK;
 
     MutexError res = do_lock();

``````````

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https://github.com/llvm/llvm-project/pull/197035