src/solaris/hpi/native_threads/src/mutex_md.c

/*
 * Copyright (c) 1994, 1998, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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 */

/*
 * Mutex HPI implementation for Solaris
 *
 * Mutexes are used both by the system-independent monitor implementation and
 * to implement critical regions elsewhere within the runtime.
 */

#include <errno.h>

#include "hpi_impl.h"

#include "mutex_md.h"
#include "threads_md.h"

/*
 * Return true of the mutex in question is already locked.  note:
 * this does not tell if the mutex is already locked by *this*
 * thread, only that is is locked by *some* thread.
 */
bool_t
mutexLocked(mutex_t *mutex)
{
    if (mutex_trylock(mutex) == 0) {
        mutex_unlock(mutex);
        return FALSE;
    }
    return TRUE;
}