1#ifndef __SPINLOCK_H__
2#define __SPINLOCK_H__
3
4#ifdef HAVE_CONFIG_H
5#include <config.h>
6#endif
7
8#include "tdb.h"
9
10#ifdef USE_SPINLOCKS
11
12#define RWLOCK_BIAS 0x1000UL
13
14/* OS SPECIFIC */
15#define MAX_BUSY_LOOPS 1000
16#undef USE_SCHED_YIELD
17
18/* ARCH SPECIFIC */
19/* We should make sure these are padded to a cache line */
20#if defined(SPARC_SPINLOCKS)
21typedef volatile char spinlock_t;
22#elif defined(POWERPC_SPINLOCKS)
23typedef volatile unsigned long spinlock_t;
24#elif defined(INTEL_SPINLOCKS)
25typedef volatile int spinlock_t;
26#elif defined(MIPS_SPINLOCKS)
27typedef volatile unsigned long spinlock_t;
28#else
29#error Need to implement spinlock code in spinlock.h
30#endif
31
32typedef struct {
33	spinlock_t lock;
34	volatile int count;
35} tdb_rwlock_t;
36
37int tdb_spinlock(TDB_CONTEXT *tdb, int list, int rw_type);
38int tdb_spinunlock(TDB_CONTEXT *tdb, int list, int rw_type);
39int tdb_create_rwlocks(int fd, unsigned int hash_size);
40int tdb_clear_spinlocks(TDB_CONTEXT *tdb);
41
42#define TDB_SPINLOCK_SIZE(hash_size) (((hash_size) + 1) * sizeof(tdb_rwlock_t))
43
44#else /* !USE_SPINLOCKS */
45#if 0
46#define tdb_create_rwlocks(fd, hash_size) 0
47#define tdb_spinlock(tdb, list, rw_type) (-1)
48#define tdb_spinunlock(tdb, list, rw_type) (-1)
49#else
50int tdb_spinlock(TDB_CONTEXT *tdb, int list, int rw_type);
51int tdb_spinunlock(TDB_CONTEXT *tdb, int list, int rw_type);
52int tdb_create_rwlocks(int fd, unsigned int hash_size);
53#endif
54int tdb_clear_spinlocks(TDB_CONTEXT *tdb);
55#define TDB_SPINLOCK_SIZE(hash_size) 0
56
57#endif
58
59#endif
60