a1ccf15e39
This is a tool for associating discrete IDs with addresses. This tool is implemented through the red-black tree method provided by <sys/tree.h>, and the time complexity when calling, searching, and deleting is optimized to O(logn) The implementation is the moving node operation of two red-black trees 1. When applying for a node, it will first check whether there is an available node in the "removed" tree. If so, the memory address of the node will be reused and moved to the "alloced" tree. 2. If the "removed" tree is an "empty tree", then the node will be requested from the memory and added to the "alloced" tree 3. Similarly, when removing a node, we set the address pointed to in the node to "NULL" and move it to the "removed" tree. Next time we alloc the node, we can reduce the overhead caused by memory application For now, we still have something that can be optimized, and that is the memory elimination mechanism of the "removed tree". The current implementation will only release all the content under the "removed" tree when the idtree is destroyed. Signed-off-by: chenrun1 <chenrun1@xiaomi.com>
125 lines
2.8 KiB
CMake
125 lines
2.8 KiB
CMake
# ##############################################################################
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# libs/libc/misc/CMakeLists.txt
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more contributor
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# license agreements. See the NOTICE file distributed with this work for
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# additional information regarding copyright ownership. The ASF licenses this
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# file to you under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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#
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# ##############################################################################
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# ##############################################################################
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# Add the internal C files to the build
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list(
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APPEND
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SRCS
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lib_mknod.c
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lib_umask.c
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lib_utsname.c
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lib_getrandom.c
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lib_xorshift128.c
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lib_tea_encrypt.c
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lib_tea_decrypt.c
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lib_cxx_initialize.c
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lib_idr.c
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lib_impure.c
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lib_memfd.c
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lib_mutex.c
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lib_fchmodat.c
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lib_fstatat.c
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lib_getfullpath.c
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lib_openat.c
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lib_mkdirat.c
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lib_utimensat.c
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lib_memoryregion.c)
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# Support for platforms that do not have long long types
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list(
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APPEND
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SRCS
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lib_umul32.c
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lib_umul64.c
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lib_umul32x64.c
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lib_uadd32x64.c
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lib_uadd64.c
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lib_usub64x32.c
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lib_usub64.c)
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if(CONFIG_PIPES)
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list(APPEND SRCS lib_mkfifo.c)
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endif()
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# Add the miscellaneous C files to the build
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list(
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APPEND
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SRCS
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lib_dumpbuffer.c
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lib_dumpvbuffer.c
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lib_fnmatch.c
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lib_debug.c
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lib_crc64.c
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lib_crc32.c
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lib_crc16.c
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lib_crc16ccitt.c
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lib_crc8.c
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lib_crc8ccitt.c
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lib_crc8table.c
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lib_glob.c
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lib_execinfo.c
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lib_ftok.c
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lib_err.c
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lib_instrument.c)
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# Add generic integer math functions
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list(APPEND SRCS lib_log2ceil.c lib_log2floor.c)
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# Keyboard driver encoder/decoder
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if(CONFIG_LIBC_KBDCODEC)
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list(APPEND SRCS lib_kbdencode.c lib_kbddecode.c)
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endif()
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# SLCD driver encoder/decoder
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if(CONFIG_LIBC_SLCDCODEC)
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list(APPEND SRCS lib_slcdencode.c lib_slcddecode.c)
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endif()
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# Environment search path support
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if(CONFIG_LIBC_ENVPATH)
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list(APPEND SRCS lib_envpath.c)
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endif()
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if(CONFIG_FDSAN)
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list(APPEND SRCS lib_fdsan.c)
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endif()
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if(CONFIG_FDCHECK)
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list(APPEND SRCS lib_fdcheck.c)
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endif()
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if(NOT CONFIG_LIBC_UNAME_DISABLE_TIMESTAMP)
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add_custom_target(
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always_rebuild_lib_utsname
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COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_SOURCE_DIR}/lib_utsname.c)
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add_dependencies(c always_rebuild_lib_utsname)
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endif()
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target_sources(c PRIVATE ${SRCS})
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