lock.h

一个简单的操作系统minix的核心代码

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				src/fs/lock.h	 	 
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20400	/* This is the file locking table.  Like the filp table, it points to the
20401	 * inode table, however, in this case to achieve advisory locking.
20402	 */
20403	EXTERN struct file_lock {
20404	  short lock_type;              /* F_RDLOCK or F_WRLOCK; 0 means unused slot */
20405	  pid_t lock_pid;               /* pid of the process holding the lock */
20406	  struct inode *lock_inode;     /* pointer to the inode locked */
20407	  off_t lock_first;             /* offset of first byte locked */
20408	  off_t lock_last;              /* offset of last byte locked */
20409	} file_lock[NR_LOCKS];