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-rw-r--r--include/spdlog/details/null_mutex.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/include/spdlog/details/null_mutex.h b/include/spdlog/details/null_mutex.h
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+++ b/include/spdlog/details/null_mutex.h
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+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <atomic>
+#include <utility>
+// null, no cost dummy "mutex" and dummy "atomic" int
+
+namespace spdlog {
+namespace details {
+struct null_mutex
+{
+ void lock() const {}
+ void unlock() const {}
+ bool try_lock() const
+ {
+ return true;
+ }
+};
+
+struct null_atomic_int
+{
+ int value;
+ null_atomic_int() = default;
+
+ explicit null_atomic_int(int new_value)
+ : value(new_value)
+ {}
+
+ int load(std::memory_order = std::memory_order_relaxed) const
+ {
+ return value;
+ }
+
+ void store(int new_value, std::memory_order = std::memory_order_relaxed)
+ {
+ value = new_value;
+ }
+
+ int exchange(int new_value, std::memory_order = std::memory_order_relaxed)
+ {
+ std::swap(new_value, value);
+ return new_value; // return value before the call
+ }
+};
+
+} // namespace details
+} // namespace spdlog