83 lines
3.2 KiB
C++
83 lines
3.2 KiB
C++
/* Copyright (C) 2008-2015 Free Software Foundation, Inc.
|
|
Contributed by Richard Henderson <rth@redhat.com>.
|
|
|
|
This file is part of the GNU Transactional Memory Library (libitm).
|
|
|
|
Libitm is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Libitm 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 General Public License for
|
|
more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef LIBITM_TLS_H
|
|
#define LIBITM_TLS_H 1
|
|
|
|
namespace GTM HIDDEN {
|
|
|
|
#if !defined(HAVE_ARCH_GTM_THREAD) || !defined(HAVE_ARCH_GTM_THREAD_DISP)
|
|
// Provides a single place to store all this libraries thread-local data.
|
|
struct gtm_thread_tls
|
|
{
|
|
#ifndef HAVE_ARCH_GTM_THREAD
|
|
// The currently active transaction. Elided if the target provides
|
|
// some efficient mechanism for storing this.
|
|
gtm_thread *thr;
|
|
#endif
|
|
#ifndef HAVE_ARCH_GTM_THREAD_DISP
|
|
// The dispatch table for the STM implementation currently in use. Elided
|
|
// if the target provides some efficient mechanism for storing this.
|
|
abi_dispatch *disp;
|
|
#endif
|
|
};
|
|
|
|
extern __thread gtm_thread_tls _gtm_thr_tls;
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_GTM_THREAD
|
|
// If the target does not provide optimized access to the thread-local
|
|
// data, simply access the TLS variable defined above.
|
|
static inline gtm_thread *gtm_thr() { return _gtm_thr_tls.thr; }
|
|
static inline void set_gtm_thr(gtm_thread *x) { _gtm_thr_tls.thr = x; }
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_GTM_THREAD_DISP
|
|
// If the target does not provide optimized access to the currently
|
|
// active dispatch table, simply access via GTM_THR.
|
|
static inline abi_dispatch * abi_disp() { return _gtm_thr_tls.disp; }
|
|
static inline void set_abi_disp(abi_dispatch *x) { _gtm_thr_tls.disp = x; }
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_GTM_MASK_STACK
|
|
// To filter out any updates that overlap the libitm stack, we define
|
|
// gtm_mask_stack_top to the entry point to the library and
|
|
// gtm_mask_stack_bottom to below the calling function (enforced with the
|
|
// noinline attribute). This definition should be fine for all
|
|
// stack-grows-down architectures.
|
|
// FIXME We fake the bottom to be lower so that we are safe even if we might
|
|
// call further functions (compared to where we called gtm_mask_stack_bottom
|
|
// in the call hierarchy) to actually undo or redo writes (e.g., memcpy).
|
|
// This is a completely arbitrary value; can we instead ensure that there are
|
|
// no such calls, or can we determine a future-proof value otherwise?
|
|
static inline void *
|
|
mask_stack_top(gtm_thread *tx) { return tx->jb.cfa; }
|
|
void * __attribute__((noinline))
|
|
mask_stack_bottom(gtm_thread *tx);
|
|
#endif
|
|
|
|
} // namespace GTM
|
|
|
|
#endif // LIBITM_TLS_H
|