21 lines
798 B
C
21 lines
798 B
C
#ifndef __VFS_TLL_H__
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#define __VFS_TLL_H__
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/* Three-level-lock. Allows read-only, read-serialized, and write-only locks */
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typedef enum { TLL_NONE, TLL_READ, TLL_READSER, TLL_WRITE } tll_access_t;
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typedef enum { TLL_DFLT = 0x0, TLL_UPGR = 0x1, TLL_PEND = 0x2 } tll_status_t;
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typedef struct {
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tll_access_t t_current; /* Current type of access to lock */
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struct worker_thread *t_owner;/* Owner of non-read-only lock */
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signed int t_readonly; /* No. of current read-only access */
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tll_status_t t_status; /* Lock status; nothing, pending upgrade, or
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* pending upgrade of read-serialized to
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* write-only */
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struct worker_thread *t_write;/* Write/read-only access requestors queue */
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struct worker_thread *t_serial;/* Read-serialized access requestors queue */
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} tll_t;
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#endif
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