CVS log for src/sys/kern/sys_descrip.c

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Default branch: MAIN
Current tag: yamt-lazymbuf-base15

Revision 1.1 / (download) - annotate - [select for diffs], Fri Mar 21 21:53:35 2008 UTC (16 years ago) by ad
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base, yamt-lazymbuf-base15, yamt-lazymbuf-base14, ad-socklock-base1
Branch point for: yamt-pf42, yamt-lazymbuf, mjf-devfs2, christos-time_t

File descriptor changes, discussed on tech-kern:

- Redo reference counting to be sane.  LWPs accessing files take a short
  term reference on the local file descriptor.  This is the most common
  case.  While a file is in a process descriptor table, a reference is
  held to the file.  The file reference count only changes during control
  operations like open() or close().  Code that comes at files from an
  unusual direction (i.e. foreign to the process) like procfs or sysctl
  takes a reference on the file (f_count), and not on a descriptor.

- Remove knowledge of reference counting and locking from most code that
  deals with files.

- Make the usual case of file descriptor lookup lockless.

- Make kqueue MP and MT safe. PR kern/38098, PR kern/38137.

- Fix numerous file handling bugs, and bugs in the descriptor code that
  affected multithreaded processes.

- Split descriptor system calls out into sys_descrip.c.

- A few stylistic changes: KNF, remove unused casts now that caddr_t is
  gone. Replace dumb gotos with loop control in a few places.

- Don't do redundant pointer passing (struct proc, lwp, filedesc *) unless
  the routine is likely to be inlined.  Most of the time it's about the
  current process.

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