libitm/query.cc

   1 /* Copyright (C) 2008-2020 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU Transactional Memory Library (libitm).
   5
   6    Libitm is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14    more details.
  15
  16    Under Section 7 of GPL version 3, you are granted additional
  17    permissions described in the GCC Runtime Library Exception, version
  18    3.1, as published by the Free Software Foundation.
  19
  20    You should have received a copy of the GNU General Public License and
  21    a copy of the GCC Runtime Library Exception along with this program;
  22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 #include "libitm_i.h"
  26
  27 using namespace GTM;
  28
  29 int ITM_REGPARM
  30 _ITM_versionCompatible (int version)
  31 {
  32   return version == _ITM_VERSION_NO;
  33 }
  34
  35
  36 const char * ITM_REGPARM
  37 _ITM_libraryVersion (void)
  38 {
  39   return "GNU libitm " _ITM_VERSION;
  40 }
  41
  42
  43 _ITM_howExecuting ITM_REGPARM
  44 _ITM_inTransaction (void)
  45 {
  46 #if defined(USE_HTM_FASTPATH)
  47   // If we use the HTM fastpath, we cannot reliably detect whether we are
  48   // in a transaction because this function can be called outside of
  49   // a transaction and thus we can't deduce this by looking at just the serial
  50   // lock.  This function isn't used in practice currently, so the easiest
  51   // way to handle it is to just abort.
  52   if (gtm_thread::serial_lock.get_htm_fastpath() && htm_transaction_active())
  53     htm_abort();
  54 #endif
  55   struct gtm_thread *tx = gtm_thr();
  56   if (tx && (tx->nesting > 0))
  57     {
  58       if (tx->state & gtm_thread::STATE_IRREVOCABLE)
  59         return inIrrevocableTransaction;
  60       else
  61         return inRetryableTransaction;
  62     }
  63   return outsideTransaction;
  64 }
  65
  66
  67 _ITM_transactionId_t ITM_REGPARM
  68 _ITM_getTransactionId (void)
  69 {
  70 #if defined(USE_HTM_FASTPATH)
  71   // See ITM_inTransaction.
  72   if (gtm_thread::serial_lock.get_htm_fastpath() && htm_transaction_active())
  73     htm_abort();
  74 #endif
  75   struct gtm_thread *tx = gtm_thr();
  76   return (tx && (tx->nesting > 0)) ? tx->id : _ITM_noTransactionId;
  77 }
  78
  79
  80 void ITM_REGPARM ITM_NORETURN
  81 _ITM_error (const _ITM_srcLocation * loc UNUSED, int errorCode UNUSED)
  82 {
  83   abort ();
  84 }