BSD的一些代码分析

the important files in the kern as below(可能有不精确的，代后会更正 ):

• bufq_disksort.c —- Seek sort for disks
• bufq_fcfs.c —- First-come first-served sort for disks
• cnmagic.c —- magic string
• core_elf32.c —- Support for the Elf32/Elf64 core file format
• core_elf64.c —- Support for the Elf32/Elf64 core file format
• core_netbsd.c —- Support for the historic NetBSD core file format
• exec_aout.c —- Support for out executable format
• exec_conf.c —- Build in functions of supporting xx executable format.exec switch
• exec_elf32.c —- Support for elf32 executable format
• exec_elf64.c —- Support for elf64 executable format
• exec_script.c —- support for script executable format
• exec_subr.c —- vm function support for exec_xx.c(setup the virtual memory space and to load the program code and data sections)
• init_main.c —- System startup; initialize the world, create process 0, mount root filesystem, and fork to create init and pagedaemon. Most of the hard work is done in the lower-level initialization routines including startup(), which does memory initialization and autoconfiguration.
• init_sysctl.c —- init system control
• init_sysent.c —- System call switch table.
• kern_acct.c —- simplify accounting operations, this mechanism should be replaced by one in which an accounting log file
• kern_auth.c —- Authorize a request by credential
• kern_clock.c —- Clock handling routines
• kern_descrip.c —- Descriptor management.
• kern_event.c —- An array containing for each system call an entry with the number of arguments, the size of the system call arguments structure, and a pointer to the function that implements the system call in the kernel
• kern_exec.c —- entry of execve switch and init execve switchs
• kern_exit.c —- a suit of exiting function about kern
• kern_fork.c —- system fork
• kern_kthread.c —- functions about kthread creating and destroying
• kern_ktrace.c —- operations to ktrace system call
• kern_lock.c —- kernel lock
• kern_lwp.c —- Support a light-weight process
• kern_malloc.c —- Functions about kernel memory malloc and free
• kern_ntptime.c —- These routines constitute the Network Time Protocol (NTP) interfaces for user and daemon application programs
• kern_physio.c —- Raw Devices and Physical I/O
• kern_proc.c —- management about process
• kern_prot.c —- System calls related to processes and protection
• kern_ras.c —- restartable atomic sequences
• kern_resource.c —- Resource controls and accounting.
• kern_sa.c —- the scheduler activation implementation that permits efficent management of concurrency
• kern_sig.c —- kernel signal
• kern_subr.c —- kern subroutines including hook, trace ,device ..
• kern_synch.c —- Scheduling algorithms
• kern_sysctl.c —- kern system control,sysctl system call.
• kern_tc.c —- kern timer counter
• kern_time.c —- Time of day and interval timer support.
• kern_timeout.c —- Timeouts are kept in a hierarchical timing wheel. The c_time is the value of the global variable “”hardclock_ticks”” when the timeout should be called.
• kern_todr.c —- time-of-day clock support
• kern_uuid.c —- support uuid (Universally Unique IDentifier)
• kern_xxx.c —- system reboot (the　ｒｅａｓｏｎ　ｔｈａｔ　ｔｈｅ name is ＸＸＸ　？？)
• subr_autoconf.c —- Autoconfiguration subroutines.
• subr_blist.c —- Bitmap allocator/deallocator, using a radix tree with hinting
• subr_bufq.c —- support　device buffer queue
• subr_callback.c —- support callback
• subr_devsw.c —- New device switch framework is developing. So debug options are always turned on.
• subr_disk.c —- subroutine　about disk
• subr_evcnt.c —- generic event counter framework
• subr_extent.c —- General purpose extent manager.
• subr_iostat.c —- support the i/o statistics
• subr_kmem.c —- allocator of kernel wired memory.
• subr_log.c —- Error log buffer for kernel printf’s.
• subr_once.c —- support Running a function exactly once
• subr_optstr.c —- The options string management functions
• subr_pool.c —- Pool resource management utility.
• subr_prf.c —- printf
• subr_prof.c —- system profiling
• subr_specificdata.c —- support specificdata
• subr_userconf.c —- user conf function suit
• subr_vmem.c —- Magazines and Vmem: Extending the Slab Allocator to Many CPUs and Arbitrary Resources
• subr_workqueue.c —- support work queue ( Enqueue the work wk into the workqueue wq)
• subr_xxx.c —- Miscellaneous trivial functions, including many that are often inline-expanded or done in assembler.
• sys_generic.c —- generic functions
• sys_pipe.c —- This file contains a high-performance replacement for the socket-based pipes scheme originally used in FreeBSD/4.4Lite.
• sys_pmc.c —- support performance-monitoring counter
• sys_process.c —- support process trace
• sys_socket.c —- support socket
• syscalls.c —- system call
• sysv_ipc.c —- support ipc
• sysv_msg.c —- support msg
• sysv_sem.c —- suppoort sem
• sysv_shm.c —- support shm
• tty.c —- support tty
• tty_bsdpty.c —- support tty
• tty_conf.c —- support tty
• tty_ptm.c —- pty multiplexor driver
• tty_pty.c —- Pseudo-teletype Driver
• tty_subr.c —- support tty
• tty_tty.c —- Indirect driver for controlling tty.
• uipc_domain.c —- network domain management
• uipc_mbuf.c —- memory management in the kernel IPC subsystem
• uipc_mbuf2.c —- memory management in the kernel IPC subsystem
• uipc_proto.c —- Definitions of protocols supported in the UNIX domain
• uipc_sem.c —- uipc semphore for socket
• uipc_socket.c —- Socket operation routines. These routines are called by the routines in sys_socket.c or from a system process, and implement the semantics of socket operations by switching out to the protocol specific routines.
• uipc_socket2.c —- Primitive routines for operating on sockets and socket buffers
• uipc_syscalls.c —- System call interface to the socket abstraction.
• uipc_usrreq.c —- UNIX domain sockets
• vfs_bio.c —- support vfs, realization of the buffer zone management
• vfs_cache.c —- vfs name cache
• vfs_getcwd.c —- Gets the current working directory
• vfs_hooks.c —- VFS hooks.
• vfs_init.c —- vfs init, Allocate and fill in operations vectors.
• vfs_lockf.c —- record locking on (vf)files
• vfs_lookup.c —- lookup function
• vfs_subr.c —- External virtual filesystem routines
• vfs_syscalls.c —- Virtual File System System Calls
• vfs_vnops.c —- vnode operations
• vfs_xattr.c —- VFS extended attribute support.
• vnode_if.c —- Vnode Operations

subr_vmem.c —- Magazines and Vmem: Extending the Slab Allocator to Many CPUs and Arbitrary Resources
其中说到的论文：
Magazines and Vmem: Extending the Slab Allocator to Many CPUs and Arbitrary Resources
http://www.usenix.org/event/usenix01/full_papers/bonwick/bonwick.pdf

具体subr_vmem.c是干什么的还得仔细看看。

vmem : fast, general resource allocation
The slab allocator caches relatively small objects and relies on a more general-purpose backing store to provide slabs and satisfy large allocations. vmem is a new resource allocator that can manage arbitrary sets of integers - anything from virtual memory addresses to minor device numbers to process IDs. vmem acts as a universal backing store for the slab allocator, and provides resource allocation problems. vmem appears to be the first resource allocator that can satisfy allocations and frees of any size in guaranteed constant time.

vmem ：快速，通用的资源分配器
slab分配器缓存相对较小的物体，并依赖于一个更通用的后端存储以提供片及满足大内存块分配。 vmem是一种新的资源配置器，可以管理任意整数-任何从虚存地址，次编号的设备号，到进程ID等整数。 vmem能够为slab分配器提供一个统一的存储后端，并解决资源分配的问题。vmem几乎是第一个保证在常数时间内满足任何大小分配和释放的资源配置器。

我进来没看懂一半,英语不好. [s:182]
为什么会这样呢?难道发贴的人中文不好,所以写不了中文???????????????开个玩笑! [s:186]

在中国会单片机编程的,但又不精通英文的不在少数?
[s:195] 难道RT-Thread的作者们想设一道门槛,滤掉我们这群人?

为了让更多的人了解RT-Thread,请使用中文!!!!!!

我进来没看懂一半,英语不好. [s:182]
为什么会这样呢?难道发贴的人中文不好,所以写不了中文???????????????开个玩笑! [s:186]

在中国会单片机编程的,但又不精通英文的不在少数?
[s:195] 难道RT-Thread的作者们想设一道门槛,滤掉我们这群人?

为了让更多的人了解RT-Thread,请使用中文!!!!!!

开始跟你一样的想法…
后来发现从技术角度上讲.只有认英文才能看到好的代码.
不然.你先让BSD的代码全写成中文的.. [s:175]

我进来没看懂一半,英语不好. [s:182]
为什么会这样呢?难道发贴的人中文不好,所以写不了中文???????????????开个玩笑! [s:186]

在中国会单片机编程的,但又不精通英文的不在少数?
[s:195] 难道RT-Thread的作者们想设一道门槛,滤掉我们这群人?

为了让更多的人了解RT-Thread,请使用中文!!!!!!

难道ls没见到过《RT-Thread编程指南》的那本300多页的电子书？

我进来没看懂一半,英语不好. [s:182]
为什么会这样呢?难道发贴的人中文不好,所以写不了中文???????????????开个玩笑! [s:186]

在中国会单片机编程的,但又不精通英文的不在少数?
[s:195] 难道RT-Thread的作者们想设一道门槛,滤掉我们这群人?

为了让更多的人了解RT-Thread,请使用中文!!!!!!

这问号叹号用的。。。。看得我心惊肉跳的。。。