compiler-rt/lib/scudo/scudo_tsd_exclusive.inc

//===-- scudo_tsd_exclusive.inc ---------------------------------*- 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 exclusive TSD fastpath functions implementation.
///
//===----------------------------------------------------------------------===//

#ifndef SCUDO_TSD_H_
#error "This file must be included inside scudo_tsd.h."
#endif // SCUDO_TSD_H_

#if SCUDO_TSD_EXCLUSIVE

enum ThreadState : u8 {
  ThreadNotInitialized = 0,
  ThreadInitialized,
  ThreadTornDown,
};
__attribute__((
    tls_model("initial-exec"))) extern THREADLOCAL ThreadState ScudoThreadState;
__attribute__((tls_model("initial-exec"))) extern THREADLOCAL ScudoTSD TSD;

extern ScudoTSD FallbackTSD;

ALWAYS_INLINE void initThreadMaybe(bool MinimalInit = false) {
  if (LIKELY(ScudoThreadState != ThreadNotInitialized))
    return;
  initThread(MinimalInit);
}

ALWAYS_INLINE ScudoTSD *
getTSDAndLock(bool *UnlockRequired) NO_THREAD_SAFETY_ANALYSIS {
  if (UNLIKELY(ScudoThreadState != ThreadInitialized)) {
    FallbackTSD.lock();
    *UnlockRequired = true;
    return &FallbackTSD;
  }
  *UnlockRequired = false;
  return &TSD;
}

#endif // SCUDO_TSD_EXCLUSIVE