1 files changed, 125 insertions, 0 deletions
diff --git a/usr/src/lib/sun_fc/common/Lockable.cc b/usr/src/lib/sun_fc/common/Lockable.cc
new file mode 100644
index 0000000000..bb9abd712d
--- /dev/null
+++ b/usr/src/lib/sun_fc/common/Lockable.cc
@@ -0,0 +1,125 @@
+/*
+ * 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
+ * or http://www.opensolaris.org/os/licensing.
+ * 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 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+
+#include "Lockable.h"
+#include <iostream>
+#include <cstdio>
+#include <cerrno>
+#include <unistd.h>
+
+using namespace std;
+
+#define	    DEADLOCK_WARNING 10
+#define	    LOCK_SLEEP 1
+
+/**
+ * @memo	    Create a lockable instance and initialize internal locks
+ */
+Lockable::Lockable() {
+	if (pthread_mutex_init(&mutex, NULL)) {
+	}
+}
+
+/**
+ * @memo	    Free up a lockable instance
+ */
+Lockable::~Lockable() {
+	if (pthread_mutex_destroy(&mutex)) {
+	}
+}
+
+/**
+ * @memo	    Unlock the instance
+ * @precondition    This thread must have locked the instance
+ * @postcondition   The instance will be unlocked
+ */
+void Lockable::unlock() {
+	unlock(&mutex);
+}
+
+/**
+ * @memo	    Unlock a given mutex lock
+ * @precondition    The lock must be held by this thread
+ * @postcondition   The lock will be released
+ * @param	    myMutex The lock to unlock
+ */
+void Lockable::unlock(pthread_mutex_t *myMutex) {
+	pthread_mutex_unlock(myMutex);
+}
+
+/**
+ * @memo	    Lock the instance
+ * @postcondition   The lock will be held by this thread.
+ */
+void Lockable::lock() {
+	lock(&mutex);
+}
+
+/**
+ * @memo	    Lock the given mutex lock
+ * @postcondition   The lock will be held by this thread
+ * @param	    myMutex The mutex lock to take
+ */
+void Lockable::lock(pthread_mutex_t *myMutex) {
+	int status;
+	int loop = 0;
+	do {
+	    loop++;
+	    status = pthread_mutex_trylock(myMutex);
+	    if (status) { 
+		switch (pthread_mutex_trylock(myMutex)) {
+		case EFAULT:
+		    cerr << "Lock failed: Fault" << endl;
+		    break;
+		case EINVAL:
+		    cerr << "Lock failed: Invalid" << endl;
+		    break;
+		case EBUSY:
+		    if (loop > DEADLOCK_WARNING) {
+			cerr << "Lock failed: Deadlock" << endl;
+		    }
+		    break;
+		case EOWNERDEAD:
+		    cerr << "Lock failed: Owner died" << endl;
+		    break;
+		case ELOCKUNMAPPED:
+		    cerr << "Lock failed: Unmapped" << endl;
+		    break;
+		case ENOTRECOVERABLE:
+		    cerr << "Lock failed: not recoverable" << endl;
+		default:
+		    if (loop > DEADLOCK_WARNING) {
+			cerr << "Lock failed: " <<strerror(status) << endl;
+			break;
+		    }
+		}
+	    } else {
+		break; // Lock taken succesfully
+	    }
+	    sleep(LOCK_SLEEP);
+	} while (status);
+}