1 | /* |
2 | * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 | * |
5 | * This code is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License version 2 only, as |
7 | * published by the Free Software Foundation. |
8 | * |
9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
12 | * version 2 for more details (a copy is included in the LICENSE file that |
13 | * accompanied this code). |
14 | * |
15 | * You should have received a copy of the GNU General Public License version |
16 | * 2 along with this work; if not, write to the Free Software Foundation, |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
18 | * |
19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
20 | * or visit www.oracle.com if you need additional information or have any |
21 | * questions. |
22 | */ |
23 | |
24 | #include "precompiled.hpp" |
25 | #include "gc/shared/memset_with_concurrent_readers.hpp" |
26 | #include "utilities/globalDefinitions.hpp" |
27 | #include "unittest.hpp" |
28 | |
29 | #include <string.h> |
30 | #include <sstream> |
31 | |
32 | static unsigned line_byte(const char* line, size_t i) { |
33 | return unsigned(line[i]) & 0xFF; |
34 | } |
35 | |
36 | TEST(gc, memset_with_concurrent_readers) { |
37 | const size_t chunk_size = 8 * BytesPerWord; |
38 | const unsigned chunk_count = 4; |
39 | const size_t block_size = (chunk_count + 4) * chunk_size; |
40 | char block[block_size]; |
41 | char clear_block[block_size]; |
42 | char set_block[block_size]; |
43 | |
44 | // block format: |
45 | // 0: unused leading chunk |
46 | // 1: chunk written from start index to end of chunk |
47 | // ... nchunks fully written chunks |
48 | // N: chunk written from start of chunk to end index |
49 | // N+1: unused trailing chunk |
50 | |
51 | const int clear_value = 0; |
52 | const int set_value = 0xAC; |
53 | |
54 | memset(clear_block, clear_value, block_size); |
55 | memset(set_block, set_value, block_size); |
56 | |
57 | for (unsigned nchunks = 0; nchunks <= chunk_count; ++nchunks) { |
58 | for (size_t start = 1; start <= chunk_size; ++start) { |
59 | for (size_t end = 0; end <= chunk_size; ++end) { |
60 | size_t set_start = chunk_size + start; |
61 | size_t set_end = (2 + nchunks) * chunk_size + end; |
62 | size_t set_size = set_end - set_start; |
63 | |
64 | memset(block, clear_value, block_size); |
65 | memset_with_concurrent_readers(&block[set_start], set_value, set_size); |
66 | bool head_clear = !memcmp(clear_block, block, set_start); |
67 | bool middle_set = !memcmp(set_block, block + set_start, set_size); |
68 | bool tail_clear = !memcmp(clear_block, block + set_end, block_size - set_end); |
69 | if (!(head_clear && middle_set && tail_clear)) { |
70 | std::ostringstream err_stream; |
71 | err_stream << "*** memset_with_concurrent_readers failed: set start " |
72 | << set_start << ", set end " << set_end << std::endl; |
73 | for (unsigned chunk = 0; chunk < (block_size / chunk_size); ++chunk) { |
74 | for (unsigned line = 0; line < (chunk_size / BytesPerWord); ++line) { |
75 | |
76 | const char* lp = &block[chunk * chunk_size + line * BytesPerWord]; |
77 | |
78 | err_stream << std::dec << chunk << "," << line << ": " << std::hex |
79 | << std::setw(2) << line_byte(lp, 0) << " " |
80 | << std::setw(2) << line_byte(lp, 1) << " " |
81 | << std::setw(2) << line_byte(lp, 2) << " " |
82 | << std::setw(2) << line_byte(lp, 3) << " " |
83 | << std::setw(2) << line_byte(lp, 4) << " " |
84 | << std::setw(2) << line_byte(lp, 5) << " " |
85 | << std::setw(2) << line_byte(lp, 6) << " " |
86 | << std::setw(2) << line_byte(lp, 7) << std::endl; |
87 | } |
88 | } |
89 | EXPECT_TRUE(head_clear) << "leading byte not clear" ; |
90 | EXPECT_TRUE(middle_set) << "memset byte not set" ; |
91 | EXPECT_TRUE(tail_clear) << "trailing bye not clear" ; |
92 | ASSERT_TRUE(head_clear && middle_set && tail_clear) << err_stream.str(); |
93 | } |
94 | } |
95 | } |
96 | } |
97 | } |
98 | |