| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include "precompiled.hpp" |
| #include <string.h> |
| #include "utilities/globalDefinitions.hpp" |
| #include <sstream> |
| #include "gc/shared/memset_with_concurrent_readers.hpp" |
| #include "unittest.hpp" |
| |
| #if INCLUDE_ALL_GCS |
| |
| static unsigned line_byte(const char* line, size_t i) { |
| return unsigned(line[i]) & 0xFF; |
| } |
| |
| TEST(gc, memset_with_concurrent_readers) { |
| const size_t chunk_size = 8 * BytesPerWord; |
| const unsigned chunk_count = 4; |
| const size_t block_size = (chunk_count + 4) * chunk_size; |
| char block[block_size]; |
| char clear_block[block_size]; |
| char set_block[block_size]; |
| |
| // block format: |
| // 0: unused leading chunk |
| // 1: chunk written from start index to end of chunk |
| // ... nchunks fully written chunks |
| // N: chunk written from start of chunk to end index |
| // N+1: unused trailing chunk |
| |
| const int clear_value = 0; |
| const int set_value = 0xAC; |
| |
| memset(clear_block, clear_value, block_size); |
| memset(set_block, set_value, block_size); |
| |
| for (unsigned nchunks = 0; nchunks <= chunk_count; ++nchunks) { |
| for (size_t start = 1; start <= chunk_size; ++start) { |
| for (size_t end = 0; end <= chunk_size; ++end) { |
| size_t set_start = chunk_size + start; |
| size_t set_end = (2 + nchunks) * chunk_size + end; |
| size_t set_size = set_end - set_start; |
| |
| memset(block, clear_value, block_size); |
| memset_with_concurrent_readers(&block[set_start], set_value, set_size); |
| bool head_clear = !memcmp(clear_block, block, set_start); |
| bool middle_set = !memcmp(set_block, block + set_start, set_size); |
| bool tail_clear = !memcmp(clear_block, block + set_end, block_size - set_end); |
| if (!(head_clear && middle_set && tail_clear)) { |
| std::ostringstream err_stream; |
| err_stream << "*** memset_with_concurrent_readers failed: set start " |
| << set_start << ", set end " << set_end << std::endl; |
| for (unsigned chunk = 0; chunk < (block_size / chunk_size); ++chunk) { |
| for (unsigned line = 0; line < (chunk_size / BytesPerWord); ++line) { |
| |
| const char* lp = &block[chunk * chunk_size + line * BytesPerWord]; |
| |
| err_stream << std::dec << chunk << "," << line << ": " << std::hex |
| << std::setw(2) << line_byte(lp, 0) << " " |
| << std::setw(2) << line_byte(lp, 1) << " " |
| << std::setw(2) << line_byte(lp, 2) << " " |
| << std::setw(2) << line_byte(lp, 3) << " " |
| << std::setw(2) << line_byte(lp, 4) << " " |
| << std::setw(2) << line_byte(lp, 5) << " " |
| << std::setw(2) << line_byte(lp, 6) << " " |
| << std::setw(2) << line_byte(lp, 7) << std::endl; |
| } |
| } |
| EXPECT_TRUE(head_clear) << "leading byte not clear"; |
| EXPECT_TRUE(middle_set) << "memset byte not set"; |
| EXPECT_TRUE(tail_clear) << "trailing bye not clear"; |
| ASSERT_TRUE(head_clear && middle_set && tail_clear) << err_stream.str(); |
| } |
| } |
| } |
| } |
| } |
| #endif |