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/* Copyright (C) 2008, 2009 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/>. */
#include "libitm_i.h"
namespace GTM HIDDEN {
gtm_cacheline_mask gtm_dispatch::mask_sink;
const gtm_cacheline *
gtm_dispatch::read_lock(const gtm_cacheline *addr, lock_type)
{
return addr;
}
gtm_dispatch::mask_pair
gtm_dispatch::write_lock(gtm_cacheline *addr, lock_type)
{
return mask_pair (addr, &mask_sink);
}
} // namespace GTM
// Avoid a dependency on libstdc++ for the pure virtuals in gtm_dispatch.
extern "C" void HIDDEN
__cxa_pure_virtual ()
{
abort ();
}
using namespace GTM;
namespace {
class serial_dispatch : public gtm_dispatch
{
public:
serial_dispatch() : gtm_dispatch(false, true) { }
// The read_lock and write_lock methods are implented by the base class.
virtual bool trycommit() { return true; }
virtual void rollback() { abort(); }
virtual void reinit() { }
virtual void fini() { }
};
} // anon namespace
static const serial_dispatch o_serial_dispatch;
gtm_dispatch *
GTM::dispatch_serial ()
{
return const_cast<serial_dispatch *>(&o_serial_dispatch);
}
// Put the transaction into serial-irrevocable mode.
void
GTM::gtm_transaction::serialirr_mode ()
{
struct gtm_dispatch *disp = gtm_disp ();
bool need_restart = true;
if (this->state & STATE_SERIAL)
{
if (this->state & STATE_IRREVOCABLE)
return;
// Given that we're already serial, the trycommit better work.
bool ok = disp->trycommit ();
assert (ok);
disp->fini ();
need_restart = false;
}
else if (serial_lock.write_upgrade ())
{
this->state |= STATE_SERIAL;
if (disp->trycommit ())
{
disp->fini ();
need_restart = false;
}
}
if (need_restart)
restart (RESTART_SERIAL_IRR);
else
{
this->state |= (STATE_SERIAL | STATE_IRREVOCABLE);
set_gtm_disp (dispatch_serial ());
}
}
void ITM_REGPARM
_ITM_changeTransactionMode (_ITM_transactionState state)
{
assert (state == modeSerialIrrevocable);
gtm_tx()->serialirr_mode ();
}
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