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7e4c4721b4
a --with-spinlocks option to configure, this does mean the on-disk tdb
format has changed, so 2.2alphaX sites will need to re-create their
tdb's. The upside is no more tdb fragmentation and a +5% on netbench.
Swings and roundabouts....
Jeremy.
(This used to be commit 9dea7b7c25)
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#ifndef __SPINLOCK_H__
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#define __SPINLOCK_H__
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "tdb.h"
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#ifdef USE_SPINLOCKS
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#define RWLOCK_BIAS 0x1000UL
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/* OS SPECIFIC */
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#define MAX_BUSY_LOOPS 1000
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#undef USE_SCHED_YIELD
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/* ARCH SPECIFIC */
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/* We should make sure these are padded to a cache line */
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#if defined(SPARC_SPINLOCKS)
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typedef volatile char spinlock_t;
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#elif defined(POWERPC_SPINLOCKS)
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typedef volatile unsigned long spinlock_t;
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#elif defined(INTEL_SPINLOCKS)
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typedef volatile int spinlock_t;
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#elif defined(MIPS_SPINLOCKS)
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typedef volatile unsigned long spinlock_t;
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#else
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#error Need to implement spinlock code in spinlock.h
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#endif
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typedef struct {
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spinlock_t lock;
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volatile int count;
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} rwlock_t;
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int tdb_spinlock(TDB_CONTEXT *tdb, int list, int rw_type);
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int tdb_spinunlock(TDB_CONTEXT *tdb, int list, int rw_type);
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int tdb_create_rwlocks(int fd, unsigned int hash_size);
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int tdb_clear_spinlocks(TDB_CONTEXT *tdb);
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#else /* !USE_SPINLOCKS */
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#if 0
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#define tdb_create_rwlocks(fd, hash_size) 0
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#define tdb_spinlock(tdb, list, rw_type) (-1)
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#define tdb_spinunlock(tdb, list, rw_type) (-1)
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#else
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int tdb_spinlock(TDB_CONTEXT *tdb, int list, int rw_type);
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int tdb_spinunlock(TDB_CONTEXT *tdb, int list, int rw_type);
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int tdb_create_rwlocks(int fd, unsigned int hash_size);
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#endif
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int tdb_clear_spinlocks(TDB_CONTEXT *tdb);
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#endif
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#endif
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