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//===-- scudo_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
//
//===----------------------------------------------------------------------===//
///
/// Scudo thread specific data definition.
/// Implementation will differ based on the thread local storage primitives
/// offered by the underlying platform.
///
//===----------------------------------------------------------------------===//
#ifndef SCUDO_TSD_H_
#define SCUDO_TSD_H_
#include "scudo_allocator.h"
#include "scudo_utils.h"
#include <pthread.h>
namespace __scudo {
struct ALIGNED(SANITIZER_CACHE_LINE_SIZE) ScudoTSD {
AllocatorCacheT Cache;
uptr QuarantineCachePlaceHolder[4];
void init();
void commitBack();
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>(
MonotonicNanoTime() >> 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:
StaticSpinMutex Mutex;
atomic_uintptr_t Precedence;
};
void initThread(bool MinimalInit);
// TSD model specific fastpath functions definitions.
#include "scudo_tsd_exclusive.inc"
#include "scudo_tsd_shared.inc"
} // namespace __scudo
#endif // SCUDO_TSD_H_
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