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/*[
 * Copyright (c) 2007 Integration Engineering Laboratory
                      University of California, Davis
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the complete modified source code.  Modifications are to
 * be distributed as patches to the released version.  Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 *   1. distribute the corresponding source modifications from the
 *    released version in the form of a patch file along with the binaries,
 *   2. add special version identification to distinguish your version
 *    in addition to the base release version number,
 *   3. provide your name and address as the primary contact for the
 *    support of your modified version, and
 *   4. retain our contact information in regard to use of the base
 *    software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/

#ifndef _MC_RWLOCK_H_
#define _MC_RWLOCK_H_
#include "macros.h"

typedef struct mc_rwlock_s {
    int num_readers;
    int write_flag;
    int write_request;
    MUTEX_T *lock;
    COND_T *cond;
} mc_rwlock_t;
typedef mc_rwlock_t* mc_rwlock_p;

int mc_rwlock_init(mc_rwlock_p rwlock);
int mc_rwlock_destroy(mc_rwlock_p rwlock);

int mc_rwlock_rdlock(mc_rwlock_p rwlock);
int mc_rwlock_rdunlock(mc_rwlock_p rwlock);

int mc_rwlock_wrlock(mc_rwlock_p rwlock);
int mc_rwlock_wrunlock(mc_rwlock_p rwlock);

#endif /* _MC_RWLOCK_H_ */

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