1 //===-- asan_lock.h ---------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is a part of AddressSanitizer, an address sanity checker. 11 // 12 // A wrapper for a simple lock. 13 //===----------------------------------------------------------------------===// 14 #ifndef ASAN_LOCK_H 15 #define ASAN_LOCK_H 16 17 #include "sanitizer_common/sanitizer_mutex.h" 18 #include "asan_internal.h" 19 20 // The locks in ASan are global objects and they are never destroyed to avoid 21 // at-exit races (that is, a lock is being used by other threads while the main 22 // thread is doing atexit destructors). 23 // We define the class using opaque storage to avoid including system headers. 24 25 namespace __asan { 26 27 class AsanLock { 28 public: 29 explicit AsanLock(LinkerInitialized); 30 void Lock(); 31 void Unlock(); 32 bool IsLocked() { return owner_ != 0; } 33 private: 34 uptr opaque_storage_[10]; 35 uptr owner_; // for debugging and for malloc_introspection_t interface 36 }; 37 38 typedef GenericScopedLock<AsanLock> ScopedLock; 39 40 } // namespace __asan 41 42 #endif // ASAN_LOCK_H 43
