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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libitm/] [alloc.cc] - Rev 776
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/* Copyright (C) 2009, 2011 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 { void gtm_thread::record_allocation (void *ptr, void (*free_fn)(void *)) { uintptr_t iptr = (uintptr_t) ptr; gtm_alloc_action *a = this->alloc_actions.find(iptr); if (a == 0) a = this->alloc_actions.insert(iptr); a->free_fn = free_fn; a->allocated = true; } void gtm_thread::forget_allocation (void *ptr, void (*free_fn)(void *)) { uintptr_t iptr = (uintptr_t) ptr; gtm_alloc_action *a = this->alloc_actions.find(iptr); if (a == 0) a = this->alloc_actions.insert(iptr); a->free_fn = free_fn; a->allocated = false; } namespace { struct commit_cb_data { aa_tree<uintptr_t, gtm_alloc_action>* parent; bool revert_p; }; } static void commit_allocations_2 (uintptr_t key, gtm_alloc_action *a, void *data) { void *ptr = (void *)key; commit_cb_data *cb_data = static_cast<commit_cb_data *>(data); if (cb_data->revert_p) { // Roll back nested allocations. if (a->allocated) a->free_fn (ptr); } else { if (a->allocated) { // Add nested allocations to parent transaction. gtm_alloc_action* a_parent = cb_data->parent->insert(key); *a_parent = *a; } else { // ??? We could eliminate a parent allocation that matches this // memory release, if we had support for removing all accesses // to this allocation from the transaction's undo and redo logs // (otherwise, the parent transaction's undo or redo might write to // data that is already shared again because of calling free()). // We don't have this support currently, and the benefit of this // optimization is unknown, so just add it to the parent. gtm_alloc_action* a_parent; a_parent = cb_data->parent->insert(key); *a_parent = *a; } } } static void commit_allocations_1 (uintptr_t key, gtm_alloc_action *a, void *cb_data) { void *ptr = (void *)key; uintptr_t revert_p = (uintptr_t) cb_data; if (a->allocated == revert_p) a->free_fn (ptr); } /* Permanently commit allocated memory during transaction. REVERT_P is true if instead of committing the allocations, we want to roll them back (and vice versa). */ void gtm_thread::commit_allocations (bool revert_p, aa_tree<uintptr_t, gtm_alloc_action>* parent) { if (parent) { commit_cb_data cb_data; cb_data.parent = parent; cb_data.revert_p = revert_p; this->alloc_actions.traverse (commit_allocations_2, &cb_data); } else this->alloc_actions.traverse (commit_allocations_1, (void *)(uintptr_t)revert_p); this->alloc_actions.clear (); } } // namespace GTM
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