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LibCore: Keep track of file offset to avoid system call for tell()

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This optimization makes the new test run 2x faster.
This commit is contained in:
kleines Filmröllchen 2023-07-06 13:41:38 +02:00 • committed by Jelle Raaijmakers
parent 111fd1e5fe
commit 10edd38543
3 changed files with 33 additions and 1 deletions
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19
Tests/LibCore/TestLibCoreStream.cpp
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@ -92,6 +92,25 @@ TEST_CASE(file_seeking_around)
EXPECT_EQ(buffer_contents, expected_seek_contents3);
}
BENCHMARK_CASE(file_tell)
{
auto file = TRY_OR_FAIL(Core::File::open("/usr/Tests/LibCore/10kb.txt"sv, Core::File::OpenMode::Read));
auto expected_file_offset = 0u;
auto ten_byte_buffer = TRY_OR_FAIL(ByteBuffer::create_uninitialized(1));
for (auto i = 0u; i < 4000; ++i) {
TRY_OR_FAIL(file->read_until_filled(ten_byte_buffer));
expected_file_offset += 1u;
EXPECT_EQ(expected_file_offset, TRY_OR_FAIL(file->tell()));
}
for (auto i = 0u; i < 4000; ++i) {
auto seek_file_offset = TRY_OR_FAIL(file->seek(-1, SeekMode::FromCurrentPosition));
expected_file_offset -= 1;
EXPECT_EQ(seek_file_offset, TRY_OR_FAIL(file->tell()));
EXPECT_EQ(expected_file_offset, TRY_OR_FAIL(file->tell()));
}
}
TEST_CASE(file_adopt_fd)
{
int rc = ::open("/usr/Tests/LibCore/long_lines.txt", O_RDONLY);