83 lines
3.2 KiB
C++
83 lines
3.2 KiB
C++
/* Copyright (C) 2008-2020 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef LIBITM_TLS_H
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#define LIBITM_TLS_H 1
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namespace GTM HIDDEN {
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#if !defined(HAVE_ARCH_GTM_THREAD) || !defined(HAVE_ARCH_GTM_THREAD_DISP)
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// Provides a single place to store all this libraries thread-local data.
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struct gtm_thread_tls
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{
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#ifndef HAVE_ARCH_GTM_THREAD
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// The currently active transaction. Elided if the target provides
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// some efficient mechanism for storing this.
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gtm_thread *thr;
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#endif
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#ifndef HAVE_ARCH_GTM_THREAD_DISP
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// The dispatch table for the STM implementation currently in use. Elided
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// if the target provides some efficient mechanism for storing this.
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abi_dispatch *disp;
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#endif
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};
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extern __thread gtm_thread_tls _gtm_thr_tls;
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#endif
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#ifndef HAVE_ARCH_GTM_THREAD
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// If the target does not provide optimized access to the thread-local
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// data, simply access the TLS variable defined above.
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static inline gtm_thread *gtm_thr() { return _gtm_thr_tls.thr; }
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static inline void set_gtm_thr(gtm_thread *x) { _gtm_thr_tls.thr = x; }
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#endif
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#ifndef HAVE_ARCH_GTM_THREAD_DISP
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// If the target does not provide optimized access to the currently
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// active dispatch table, simply access via GTM_THR.
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static inline abi_dispatch * abi_disp() { return _gtm_thr_tls.disp; }
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static inline void set_abi_disp(abi_dispatch *x) { _gtm_thr_tls.disp = x; }
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#endif
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#ifndef HAVE_ARCH_GTM_MASK_STACK
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// To filter out any updates that overlap the libitm stack, we define
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// gtm_mask_stack_top to the entry point to the library and
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// gtm_mask_stack_bottom to below the calling function (enforced with the
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// noinline attribute). This definition should be fine for all
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// stack-grows-down architectures.
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// FIXME We fake the bottom to be lower so that we are safe even if we might
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// call further functions (compared to where we called gtm_mask_stack_bottom
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// in the call hierarchy) to actually undo or redo writes (e.g., memcpy).
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// This is a completely arbitrary value; can we instead ensure that there are
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// no such calls, or can we determine a future-proof value otherwise?
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static inline void *
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mask_stack_top(gtm_thread *tx) { return tx->jb.cfa; }
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void * __attribute__((noinline))
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mask_stack_bottom(gtm_thread *tx);
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#endif
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} // namespace GTM
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#endif // LIBITM_TLS_H
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