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