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libspl: Implement LWP rwlock interface

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This implements a subset of the LWP rwlock interface by wrapping the
equivalent POSIX thread interface. It is a superset of the features
needed by ztest.

The missing bits are {,_}rw_read_held() and {,_}rw_write_held().

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1970
This commit is contained in:
Richard Yao 2014-04-30 13:12:27 -04:00 committed by Brian Behlendorf
parent c6e924fea8
commit 3af3df905f
2 changed files with 52 additions and 0 deletions
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1
include/sys/zfs_context.h
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@ -90,6 +90,7 @@
#include <string.h> #include <string.h>
#include <strings.h> #include <strings.h>
#include <pthread.h> #include <pthread.h>
#include <synch.h>
#include <assert.h> #include <assert.h>
#include <alloca.h> #include <alloca.h>
#include <umem.h> #include <umem.h>

51
lib/libspl/include/synch.h
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@ -21,10 +21,61 @@
*/ */
/* /*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Copyright 2014 Zettabyte Software, LLC. All rights reserved.
* Use is subject to license terms. * Use is subject to license terms.
*/ */
#ifndef _LIBSPL_SYNCH_H #ifndef _LIBSPL_SYNCH_H
#define _LIBSPL_SYNCH_H #define _LIBSPL_SYNCH_H
#ifndef __sun__
#include <assert.h>
#include <pthread.h>
/*
* Definitions of synchronization types.
*/
#define USYNC_THREAD 0x00 /* private to a process */
#define USYNC_PROCESS 0x01 /* shared by processes */
typedef pthread_rwlock_t rwlock_t;
#define DEFAULTRWLOCK PTHREAD_RWLOCK_INITIALIZER
static inline int
rwlock_init(rwlock_t *rwlp, int type, void *arg)
{
pthread_rwlockattr_t attr;
int err = 0;
VERIFY0(pthread_rwlockattr_init(&attr));
switch (type) {
case USYNC_THREAD:
VERIFY0(pthread_rwlockattr_setpshared(&attr,
PTHREAD_PROCESS_PRIVATE));
break;
case USYNC_PROCESS:
VERIFY0(pthread_rwlockattr_setpshared(&attr,
PTHREAD_PROCESS_SHARED));
break;
default:
VERIFY0(1);
}
err = pthread_rwlock_init(rwlp, &attr);
VERIFY0(pthread_rwlockattr_destroy(&attr));
return (err);
}
#define rwlock_destroy(x) pthread_rwlock_destroy((x))
#define rw_rdlock(x) pthread_rwlock_rdlock((x))
#define rw_wrlock(x) pthread_rwlock_wrlock((x))
#define rw_unlock(x) pthread_rwlock_unlock((x))
#define rw_tryrdlock(x) pthread_rwlock_tryrdlock((x))
#define rw_trywrlock(x) pthread_rwlock_trywrlock((x))
#endif /* __sun__ */
#endif #endif