/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_CONDVAR_IMPL_H
#define _SYS_CONDVAR_IMPL_H
/*
* Implementation-private definitions for condition variables
*/
#ifndef _ASM
#endif /* _ASM */
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _ASM
/*
* Condtion variables.
*/
typedef struct _condvar_impl {
#endif /* _ASM */
/*
* The cvwaitlock_t structure and associated macros provide an implementation
* of a locking mechanism that allows recursion on the reader lock without
* danger of a pending write lock elsewhere being able to cause a deadlock.
* The provision for supporting recursion is necessary for use with the
* netinfo (neti) kernel module when processing network data.
*
* Support for recursion (giving precedence to readers and allowing them
* to enter even when a write is blocked) can result in write starvation.
* There is no priority inheritence for this locking interface.
*/
typedef struct cvwaitlock_s {
int cvw_refcnt;
} cvwaitlock_t;
(_c)->cvw_refcnt = 0; \
}
while ((_c)->cvw_refcnt < 0) \
(_c)->cvw_refcnt++; \
}
while ((_c)->cvw_refcnt != 0) \
}
if ((--((_c)->cvw_refcnt)) == 0) \
}
(_c)->cvw_refcnt = 0; \
}
}
}
#ifdef __cplusplus
}
#endif
#endif /* _SYS_CONDVAR_IMPL_H */