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// Based on https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
#ifndef SIMPLE_WEB_MUTEX_HPP
#define SIMPLE_WEB_MUTEX_HPP
#include <mutex>
// Enable thread safety attributes only with clang.
#if defined(__clang__) && (!defined(SWIG))
#define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
#else
#define THREAD_ANNOTATION_ATTRIBUTE__(x) // no-op
#endif
#define CAPABILITY(x) \
THREAD_ANNOTATION_ATTRIBUTE__(capability(x))
#define SCOPED_CAPABILITY \
THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
#define GUARDED_BY(x) \
THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
#define PT_GUARDED_BY(x) \
THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
#define ACQUIRED_BEFORE(...) \
THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
#define ACQUIRED_AFTER(...) \
THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
#define REQUIRES(...) \
THREAD_ANNOTATION_ATTRIBUTE__(requires_capability(__VA_ARGS__))
#define REQUIRES_SHARED(...) \
THREAD_ANNOTATION_ATTRIBUTE__(requires_shared_capability(__VA_ARGS__))
#define ACQUIRE(...) \
THREAD_ANNOTATION_ATTRIBUTE__(acquire_capability(__VA_ARGS__))
#define ACQUIRE_SHARED(...) \
THREAD_ANNOTATION_ATTRIBUTE__(acquire_shared_capability(__VA_ARGS__))
#define RELEASE(...) \
THREAD_ANNOTATION_ATTRIBUTE__(release_capability(__VA_ARGS__))
#define RELEASE_SHARED(...) \
THREAD_ANNOTATION_ATTRIBUTE__(release_shared_capability(__VA_ARGS__))
#define TRY_ACQUIRE(...) \
THREAD_ANNOTATION_ATTRIBUTE__(try_acquire_capability(__VA_ARGS__))
#define TRY_ACQUIRE_SHARED(...) \
THREAD_ANNOTATION_ATTRIBUTE__(try_acquire_shared_capability(__VA_ARGS__))
#define EXCLUDES(...) \
THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
#define ASSERT_CAPABILITY(x) \
THREAD_ANNOTATION_ATTRIBUTE__(assert_capability(x))
#define ASSERT_SHARED_CAPABILITY(x) \
THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_capability(x))
#define RETURN_CAPABILITY(x) \
THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
#define NO_THREAD_SAFETY_ANALYSIS \
THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
namespace SimpleWeb {
/// Mutex class that is annotated for Clang Thread Safety Analysis.
class CAPABILITY("mutex") Mutex {
std::mutex mutex;
public:
void lock() ACQUIRE() {
mutex.lock();
}
void unlock() RELEASE() {
mutex.unlock();
}
};
/// Scoped mutex guard class that is annotated for Clang Thread Safety Analysis.
class SCOPED_CAPABILITY LockGuard {
Mutex &mutex;
bool locked = true;
public:
LockGuard(Mutex &mutex_) ACQUIRE(mutex_) : mutex(mutex_) {
mutex.lock();
}
void unlock() RELEASE() {
mutex.unlock();
locked = false;
}
~LockGuard() RELEASE() {
if(locked)
mutex.unlock();
}
};
} // namespace SimpleWeb
#endif // SIMPLE_WEB_MUTEX_HPP
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