//===----------------------------- Registers.hpp --------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//
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// Abstract interface to shared reader/writer log, hiding platform and
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// configuration differences.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __RWMUTEX_HPP__
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#define __RWMUTEX_HPP__
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#if defined(_WIN32)
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#include <windows.h>
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#elif !defined(_LIBUNWIND_HAS_NO_THREADS)
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#include <pthread.h>
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#endif
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namespace libunwind {
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#if defined(_LIBUNWIND_HAS_NO_THREADS)
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class _LIBUNWIND_HIDDEN RWMutex {
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public:
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bool lock_shared() { return true; }
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bool unlock_shared() { return true; }
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bool lock() { return true; }
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bool unlock() { return true; }
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};
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#elif defined(_WIN32)
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class _LIBUNWIND_HIDDEN RWMutex {
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public:
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bool lock_shared() {
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AcquireSRWLockShared(&_lock);
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return true;
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}
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bool unlock_shared() {
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ReleaseSRWLockShared(&_lock);
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return true;
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}
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bool lock() {
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AcquireSRWLockExclusive(&_lock);
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return true;
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}
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bool unlock() {
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ReleaseSRWLockExclusive(&_lock);
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return true;
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}
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private:
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SRWLOCK _lock = SRWLOCK_INIT;
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};
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#else
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class _LIBUNWIND_HIDDEN RWMutex {
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public:
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bool lock_shared() { return pthread_rwlock_rdlock(&_lock) == 0; }
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bool unlock_shared() { return pthread_rwlock_unlock(&_lock) == 0; }
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bool lock() { return pthread_rwlock_wrlock(&_lock) == 0; }
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bool unlock() { return pthread_rwlock_unlock(&_lock) == 0; }
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private:
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pthread_rwlock_t _lock = PTHREAD_RWLOCK_INITIALIZER;
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};
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#endif
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} // namespace libunwind
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#endif // __RWMUTEX_HPP__
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