1 //===----------------------------- Registers.hpp --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
9 // Abstract interface to shared reader/writer log, hiding platform and
10 // configuration differences.
12 //===----------------------------------------------------------------------===//
14 #ifndef __RWMUTEX_HPP__
15 #define __RWMUTEX_HPP__
19 #elif !defined(_LIBUNWIND_HAS_NO_THREADS)
25 #if defined(_LIBUNWIND_HAS_NO_THREADS)
27 class _LIBUNWIND_HIDDEN RWMutex {
29 bool lock_shared() { return true; }
30 bool unlock_shared() { return true; }
31 bool lock() { return true; }
32 bool unlock() { return true; }
37 class _LIBUNWIND_HIDDEN RWMutex {
40 AcquireSRWLockShared(&_lock);
43 bool unlock_shared() {
44 ReleaseSRWLockShared(&_lock);
48 AcquireSRWLockExclusive(&_lock);
52 ReleaseSRWLockExclusive(&_lock);
57 SRWLOCK _lock = SRWLOCK_INIT;
62 class _LIBUNWIND_HIDDEN RWMutex {
64 bool lock_shared() { return pthread_rwlock_rdlock(&_lock) == 0; }
65 bool unlock_shared() { return pthread_rwlock_unlock(&_lock) == 0; }
66 bool lock() { return pthread_rwlock_wrlock(&_lock) == 0; }
67 bool unlock() { return pthread_rwlock_unlock(&_lock) == 0; }
70 pthread_rwlock_t _lock = PTHREAD_RWLOCK_INITIALIZER;
75 } // namespace libunwind
77 #endif // __RWMUTEX_HPP__