| /* |
| * Copyright (c) 2021 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "pas_config.h" |
| |
| #if LIBPAS_ENABLED |
| |
| #include "pas_local_view_cache.h" |
| |
| #include "pas_segregated_exclusive_view_inlines.h" |
| #include "pas_segregated_page_inlines.h" |
| #include "pas_segregated_size_directory.h" |
| |
| void pas_local_view_cache_construct(pas_local_view_cache* cache, |
| uint8_t capacity) |
| { |
| pas_local_allocator_scavenger_data_construct( |
| &cache->scavenger_data, pas_local_allocator_view_cache_kind); |
| |
| cache->capacity = capacity; |
| cache->bottom_index = 0; |
| cache->top_index = 0; |
| cache->is_full = false; |
| |
| if (PAS_ENABLE_TESTING) { |
| uint8_t index; |
| |
| for (index = capacity; index--;) |
| pas_compact_segregated_exclusive_view_ptr_store(cache->views + index, NULL); |
| } |
| } |
| |
| void pas_local_view_cache_move(pas_local_view_cache* destination, |
| pas_local_view_cache* source) |
| { |
| memcpy(destination, source, PAS_LOCAL_VIEW_CACHE_SIZE(source->capacity)); |
| } |
| |
| static bool stop_impl(pas_local_view_cache* cache, |
| pas_lock_lock_mode page_lock_mode) |
| { |
| pas_lock* held_lock; |
| pas_segregated_size_directory* directory; |
| pas_segregated_page_config page_config; |
| |
| directory = NULL; |
| page_config = (pas_segregated_page_config){ }; |
| held_lock = NULL; |
| |
| while (!pas_local_view_cache_is_empty(cache)) { |
| pas_segregated_exclusive_view* cached_view; |
| pas_segregated_page* page; |
| bool should_notify_eligibility; |
| |
| cached_view = pas_local_view_cache_pop(cache); |
| |
| if (directory) { |
| PAS_ASSERT( |
| pas_compact_segregated_size_directory_ptr_load_non_null(&cached_view->directory) |
| == directory); |
| } else { |
| directory = pas_compact_segregated_size_directory_ptr_load_non_null(&cached_view->directory); |
| page_config = *pas_segregated_page_config_kind_get_config(directory->base.page_config_kind); |
| } |
| |
| page = pas_segregated_page_for_boundary(cached_view->page_boundary, page_config); |
| |
| if (!pas_segregated_page_switch_lock_with_mode(page, &held_lock, page_lock_mode, page_config)) { |
| PAS_ASSERT(!pas_local_view_cache_is_full(cache)); |
| pas_local_view_cache_push(cache, cached_view); |
| return false; |
| } |
| |
| should_notify_eligibility = true; |
| pas_segregated_exclusive_view_did_stop_allocating( |
| cached_view, directory, page, page_config, should_notify_eligibility); |
| } |
| |
| pas_lock_switch(&held_lock, NULL); |
| return true; |
| } |
| |
| bool pas_local_view_cache_stop(pas_local_view_cache* cache, |
| pas_lock_lock_mode page_lock_mode) |
| { |
| bool result; |
| |
| PAS_ASSERT(!cache->scavenger_data.is_in_use); |
| |
| cache->scavenger_data.is_in_use = true; |
| pas_compiler_fence(); |
| |
| result = stop_impl(cache, page_lock_mode); |
| |
| if (result) |
| cache->scavenger_data.should_stop_count = 0; |
| |
| pas_compiler_fence(); |
| cache->scavenger_data.is_in_use = false; |
| |
| return result; |
| } |
| |
| #endif /* LIBPAS_ENABLED */ |
| |