26 lines
833 B
C
26 lines
833 B
C
#ifndef _LINUX_PIPE_FS_I_H
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#define _LINUX_PIPE_FS_I_H
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struct pipe_inode_info {
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struct wait_queue * read_wait;
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struct wait_queue * write_wait;
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char * base;
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unsigned int head;
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unsigned int tail;
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unsigned int readers;
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unsigned int writers;
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};
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#define PIPE_READ_WAIT(inode) ((inode).u.pipe_i.read_wait)
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#define PIPE_WRITE_WAIT(inode) ((inode).u.pipe_i.write_wait)
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#define PIPE_BASE(inode) ((inode).u.pipe_i.base)
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#define PIPE_HEAD(inode) ((inode).u.pipe_i.head)
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#define PIPE_TAIL(inode) ((inode).u.pipe_i.tail)
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#define PIPE_READERS(inode) ((inode).u.pipe_i.readers)
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#define PIPE_WRITERS(inode) ((inode).u.pipe_i.writers)
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#define PIPE_SIZE(inode) ((PIPE_HEAD(inode)-PIPE_TAIL(inode))&(PAGE_SIZE-1))
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#define PIPE_EMPTY(inode) (PIPE_HEAD(inode)==PIPE_TAIL(inode))
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#define PIPE_FULL(inode) (PIPE_SIZE(inode)==(PAGE_SIZE-1))
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#endif
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