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-rw-r--r--src/RWMutex.hpp77
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diff --git a/src/RWMutex.hpp b/src/RWMutex.hpp
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+//===----------------------------- Registers.hpp --------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//
+// Abstract interface to shared reader/writer log, hiding platform and
+// configuration differences.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __RWMUTEX_HPP__
+#define __RWMUTEX_HPP__
+
+#if defined(_WIN32)
+#include <windows.h>
+#elif !defined(_LIBUNWIND_HAS_NO_THREADS)
+#include <pthread.h>
+#endif
+
+namespace libunwind {
+
+#if defined(_LIBUNWIND_HAS_NO_THREADS)
+
+class _LIBUNWIND_HIDDEN RWMutex {
+public:
+ bool lock_shared() { return true; }
+ bool unlock_shared() { return true; }
+ bool lock() { return true; }
+ bool unlock() { return true; }
+};
+
+#elif defined(_WIN32)
+
+class _LIBUNWIND_HIDDEN RWMutex {
+public:
+ bool lock_shared() {
+ AcquireSRWLockShared(&_lock);
+ return true;
+ }
+ bool unlock_shared() {
+ ReleaseSRWLockShared(&_lock);
+ return true;
+ }
+ bool lock() {
+ AcquireSRWLockExclusive(&_lock);
+ return true;
+ }
+ bool unlock() {
+ ReleaseSRWLockExclusive(&_lock);
+ return true;
+ }
+
+private:
+ SRWLOCK _lock = SRWLOCK_INIT;
+};
+
+#else
+
+class _LIBUNWIND_HIDDEN RWMutex {
+public:
+ bool lock_shared() { return pthread_rwlock_rdlock(&_lock) == 0; }
+ bool unlock_shared() { return pthread_rwlock_unlock(&_lock) == 0; }
+ bool lock() { return pthread_rwlock_wrlock(&_lock) == 0; }
+ bool unlock() { return pthread_rwlock_unlock(&_lock) == 0; }
+
+private:
+ pthread_rwlock_t _lock = PTHREAD_RWLOCK_INITIALIZER;
+};
+
+#endif
+
+} // namespace libunwind
+
+#endif // __RWMUTEX_HPP__