55 lines
2.2 KiB
C
55 lines
2.2 KiB
C
/* Internal per-thread variables for the Hurd.
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Copyright (C) 1994-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _HURD_THREADVAR_H
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#define _HURD_THREADVAR_H
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#include <features.h>
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#include <tls.h>
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/* The per-thread variables are found by ANDing this mask
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with the value of the stack pointer and then adding this offset.
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In the multi-threaded case, cthreads initialization sets
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__hurd_threadvar_stack_mask to ~(cthread_stack_size - 1), a mask which
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finds the base of the fixed-size cthreads stack; and
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__hurd_threadvar_stack_offset to a small offset that skips the data
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cthreads itself maintains at the base of each thread's stack.
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In the single-threaded or libpthread case, __hurd_threadvar_stack_mask is
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zero, so the stack pointer is ignored. */
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extern unsigned long int __hurd_threadvar_stack_mask;
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extern unsigned long int __hurd_threadvar_stack_offset;
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/* The variables __hurd_sigthread_stack_base and
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__hurd_sigthread_stack_end define the bounds of the stack used by the
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signal thread, so that thread can always be specifically identified. */
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extern unsigned long int __hurd_sigthread_stack_base;
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extern unsigned long int __hurd_sigthread_stack_end;
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/* Store the MiG reply port reply port until we enable TLS. */
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extern mach_port_t __hurd_reply_port0;
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/* This returns either the TLS reply port variable, or a single-thread variable
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when TLS is not initialized yet. */
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#define __hurd_local_reply_port (*(__LIBC_NO_TLS () ? &__hurd_reply_port0 : &THREAD_SELF->reply_port))
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#endif /* hurd/threadvar.h */
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