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| /freebsd-11.0-release/sys/sys/ | ||
| H A D | filedesc.h | diff 138838 Tue Dec 14 09:09:51 MST 2004 phk Add a new kind of reference count (fd_holdcnt) to struct filedesc which holds on to just the data structure and the mutex. (The existing refcount (fd_refcnt) holds onto the open files in the descriptor.) The fd_holdcnt is protected by fdesc_mtx, fd_refcnt by FILEDESC_LOCK. Add fdhold(struct proc *) which gets a hold on the filedescriptors of the specified proc.. Add fddrop(struct filedesc *) which drops the fd_holdcnt and if zero destroys the mutex and frees the memory. Initialize the fd_holdcnt to one in fdinit(). Normal operations on the filedesc structure will not change it. In fdfree() use fddrop() to dispose of the mutex and structure. Hold the FILEDESC_LOCK() until we have cleaned out the contents and carefully set the fields to null values during cleanup. Use fdhold()/fddrop() in mountcheckdirs() and sysctl_kern_file(). |
| /freebsd-11.0-release/sys/kern/ | ||
| H A D | kern_descrip.c | diff 138838 Tue Dec 14 09:09:51 MST 2004 phk Add a new kind of reference count (fd_holdcnt) to struct filedesc which holds on to just the data structure and the mutex. (The existing refcount (fd_refcnt) holds onto the open files in the descriptor.) The fd_holdcnt is protected by fdesc_mtx, fd_refcnt by FILEDESC_LOCK. Add fdhold(struct proc *) which gets a hold on the filedescriptors of the specified proc.. Add fddrop(struct filedesc *) which drops the fd_holdcnt and if zero destroys the mutex and frees the memory. Initialize the fd_holdcnt to one in fdinit(). Normal operations on the filedesc structure will not change it. In fdfree() use fddrop() to dispose of the mutex and structure. Hold the FILEDESC_LOCK() until we have cleaned out the contents and carefully set the fields to null values during cleanup. Use fdhold()/fddrop() in mountcheckdirs() and sysctl_kern_file(). |
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