1//===-- tsd.h ---------------------------------------------------*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef SCUDO_TSD_H_ 10#define SCUDO_TSD_H_ 11 12#include "atomic_helpers.h" 13#include "common.h" 14#include "mutex.h" 15 16#include <limits.h> // for PTHREAD_DESTRUCTOR_ITERATIONS 17#include <pthread.h> 18 19// With some build setups, this might still not be defined. 20#ifndef PTHREAD_DESTRUCTOR_ITERATIONS 21#define PTHREAD_DESTRUCTOR_ITERATIONS 4 22#endif 23 24namespace scudo { 25 26template <class Allocator> struct ALIGNED(SCUDO_CACHE_LINE_SIZE) TSD { 27 typename Allocator::CacheT Cache; 28 typename Allocator::QuarantineCacheT QuarantineCache; 29 u8 DestructorIterations; 30 31 void initLinkerInitialized(Allocator *Instance) { 32 Instance->initCache(&Cache); 33 DestructorIterations = PTHREAD_DESTRUCTOR_ITERATIONS; 34 } 35 void init(Allocator *Instance) { 36 memset(this, 0, sizeof(*this)); 37 initLinkerInitialized(Instance); 38 } 39 40 void commitBack(Allocator *Instance) { Instance->commitBack(this); } 41 42 inline bool tryLock() { 43 if (Mutex.tryLock()) { 44 atomic_store_relaxed(&Precedence, 0); 45 return true; 46 } 47 if (atomic_load_relaxed(&Precedence) == 0) 48 atomic_store_relaxed( 49 &Precedence, 50 static_cast<uptr>(getMonotonicTime() >> FIRST_32_SECOND_64(16, 0))); 51 return false; 52 } 53 inline void lock() { 54 atomic_store_relaxed(&Precedence, 0); 55 Mutex.lock(); 56 } 57 inline void unlock() { Mutex.unlock(); } 58 inline uptr getPrecedence() { return atomic_load_relaxed(&Precedence); } 59 60private: 61 HybridMutex Mutex; 62 atomic_uptr Precedence; 63}; 64 65} // namespace scudo 66 67#endif // SCUDO_TSD_H_ 68