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) 21 typedef volatile char spinlock_t; 22 #elif defined(POWERPC_SPINLOCKS) 23 typedef volatile unsigned long spinlock_t; 24 #elif defined(INTEL_SPINLOCKS) 25 typedef volatile int spinlock_t; 26 #elif defined(MIPS_SPINLOCKS) 27 typedef volatile unsigned long spinlock_t; 28 #else 29 #error Need to implement spinlock code in spinlock.h 30 #endif 31 32 typedef struct { 33 spinlock_t lock; 34 volatile int count; 35 } tdb_rwlock_t; 36 37 int tdb_spinlock(TDB_CONTEXT *tdb, int list, int rw_type); 38 int tdb_spinunlock(TDB_CONTEXT *tdb, int list, int rw_type); 39 int tdb_create_rwlocks(int fd, unsigned int hash_size); 40 int 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 50 int tdb_spinlock(TDB_CONTEXT *tdb, int list, int rw_type); 51 int tdb_spinunlock(TDB_CONTEXT *tdb, int list, int rw_type); 52 int tdb_create_rwlocks(int fd, unsigned int hash_size); 53 #endif 54 int tdb_clear_spinlocks(TDB_CONTEXT *tdb); 55 #define TDB_SPINLOCK_SIZE(hash_size) 0 56 57 #endif 58 59 #endif 60
