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//===-- tsd.h ---------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef SCUDO_TSD_H_
#define SCUDO_TSD_H_
#include "atomic_helpers.h"
#include "common.h"
#include "mutex.h"
#include <limits.h> // for PTHREAD_DESTRUCTOR_ITERATIONS
#include <pthread.h>
// With some build setups, this might still not be defined.
#ifndef PTHREAD_DESTRUCTOR_ITERATIONS
#define PTHREAD_DESTRUCTOR_ITERATIONS 4
#endif
namespace scudo {
template <class Allocator> struct alignas(SCUDO_CACHE_LINE_SIZE) TSD {
typename Allocator::CacheT Cache;
typename Allocator::QuarantineCacheT QuarantineCache;
using ThisT = TSD<Allocator>;
u8 DestructorIterations = 0;
void init(Allocator *Instance) {
DCHECK_EQ(DestructorIterations, 0U);
DCHECK(isAligned(reinterpret_cast<uptr>(this), alignof(ThisT)));
Instance->initCache(&Cache);
DestructorIterations = PTHREAD_DESTRUCTOR_ITERATIONS;
}
void commitBack(Allocator *Instance) { Instance->commitBack(this); }
inline bool tryLock() {
if (Mutex.tryLock()) {
atomic_store_relaxed(&Precedence, 0);
return true;
}
if (atomic_load_relaxed(&Precedence) == 0)
atomic_store_relaxed(
&Precedence,
static_cast<uptr>(getMonotonicTime() >> FIRST_32_SECOND_64(16, 0)));
return false;
}
inline void lock() {
atomic_store_relaxed(&Precedence, 0);
Mutex.lock();
}
inline void unlock() { Mutex.unlock(); }
inline uptr getPrecedence() { return atomic_load_relaxed(&Precedence); }
private:
HybridMutex Mutex;
atomic_uptr Precedence = {};
};
} // namespace scudo
#endif // SCUDO_TSD_H_
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