source/tdb/spinlock.h

   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 #else /* !USE_SPINLOCKS */
  43 #if 0
  44 #define tdb_create_rwlocks(fd, hash_size) 0
  45 #define tdb_spinlock(tdb, list, rw_type) (-1)
  46 #define tdb_spinunlock(tdb, list, rw_type) (-1)
  47 #else
  48 int tdb_spinlock(TDB_CONTEXT *tdb, int list, int rw_type);
  49 int tdb_spinunlock(TDB_CONTEXT *tdb, int list, int rw_type);
  50 int tdb_create_rwlocks(int fd, unsigned int hash_size);
  51 #endif
  52 int tdb_clear_spinlocks(TDB_CONTEXT *tdb);
  53 #endif
  54
  55 #endif