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/* Internal per-thread variables for the Hurd.
Copyright (C) 1994-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _HURD_THREADVAR_H
#define _HURD_THREADVAR_H
#include <features.h>
#include <tls.h>
/* The per-thread variables are found by ANDing this mask
with the value of the stack pointer and then adding this offset.
In the multi-threaded case, cthreads initialization sets
__hurd_threadvar_stack_mask to ~(cthread_stack_size - 1), a mask which
finds the base of the fixed-size cthreads stack; and
__hurd_threadvar_stack_offset to a small offset that skips the data
cthreads itself maintains at the base of each thread's stack.
In the single-threaded or libpthread case, __hurd_threadvar_stack_mask is
zero, so the stack pointer is ignored. */
extern unsigned long int __hurd_threadvar_stack_mask;
extern unsigned long int __hurd_threadvar_stack_offset;
/* The variables __hurd_sigthread_stack_base and
__hurd_sigthread_stack_end define the bounds of the stack used by the
signal thread, so that thread can always be specifically identified. */
extern unsigned long int __hurd_sigthread_stack_base;
extern unsigned long int __hurd_sigthread_stack_end;
/* Store the MiG reply port reply port until we enable TLS. */
extern mach_port_t __hurd_reply_port0;
/* This returns either the TLS reply port variable, or a single-thread variable
when TLS is not initialized yet. */
#define __hurd_local_reply_port (*(__LIBC_NO_TLS () ? &__hurd_reply_port0 : &THREAD_SELF->reply_port))
#endif /* hurd/threadvar.h */
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