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18bb45f4b1
This commit refactors InnoDB to remove its dependency on tpool internals
logic and significantly reduce platform-specific #ifdefs
(HAVE_URING, _WIN32,__linux__)
Key changes:
- Encapsulated AIO support checks into tpool::is_aio_supported().
- Centralized Linux AIO implementation choice and fallback within
tpool::create_linux_aio(), removing complex #ifdef mazes from
os0file.cc.
- Linux-specific AIO source files are now:
- aio_libaio.cc: Exports create_libaio(). Previously, this logic
was in confusingly named aio_linux.cc (confusingly since uring
introduction)
- aio_liburing.cc: Exports create_liburing(), and not
create_linux_io()
- aio_linux.cc: Exports create_linux_aio(), handles Linux AIO
implementation selection and fallbacks.
- Simplified/modernized CMake build using target_sources() and
target_compile_definitions(), all available since CMake 2.8.12
With this change, there is no need to include ${CMAKE_SOURCE_DIR}/tpool
or add TPOOL_DEFINES flags anymore, target_link_libraries(lib tpool)
does all that.
- LINUX_NATIVE_AIO preprocessor constant is renamed to HAVE_LIBAIO,
analog to existing HAVE_URING.
Ever since we got a second Linux native aio with uring implementation,
this name because very confusing.
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/* Copyright (C) 2025 MariaDB Corporation.
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This program is free software; you can redistribute itand /or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 - 1301 USA*/
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/*
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This file exports create_linux_aio() function which is used to create
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an asynchronous IO implementation for Linux (currently either libaio or
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uring).
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*/
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#include "tpool.h"
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#include <stdio.h>
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namespace tpool
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{
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// Forward declarations of aio implementations
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#ifdef HAVE_LIBAIO
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// defined in aio_libaio.cc
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aio *create_libaio(thread_pool *pool, int max_io);
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#endif
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#if defined HAVE_URING
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// defined in aio_uring.cc
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aio *create_uring(thread_pool *pool, int max_io);
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#endif
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/*
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@brief
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Choose native linux aio implementation based on availability and user
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preference.
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@param pool - thread pool to use for aio operations
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@param max_io - maximum number of concurrent io operations
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@param impl - implementation to use, can be one of the following:
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@returns
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A pointer to the aio implementation object, or nullptr if no suitable
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implementation is available.
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If impl is OS_IO_DEFAULT, it will try uring first, fallback to libaio
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If impl is OS_IO_URING or OS_IO_LIBAIO, it won't fallback
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*/
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aio *create_linux_aio(thread_pool *pool, int max_io, aio_implementation impl)
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{
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#if defined HAVE_URING
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if (impl == OS_IO_URING || impl == OS_IO_DEFAULT)
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{
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aio *ret= create_uring(pool, max_io);
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if (ret)
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return ret;
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else if (impl == OS_IO_URING)
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return nullptr; // uring is not available
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else
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fprintf(stderr, "create_uring failed: falling back to libaio\n");
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}
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#endif
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#if defined HAVE_LIBAIO
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if (impl == OS_IO_LIBAIO || impl == OS_IO_DEFAULT)
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return create_libaio(pool, max_io);
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#endif
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return nullptr;
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}
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} // namespace tpool
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