the begginning

versioning/BRM/lock_grabber.cpp

@@ -0,0 +1,87 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program 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 for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+/* Takes two params,
+ *    first, which lock use
+ *    second, which side to use (read or write)
+ *    third, lock or unlock it
+ */
+
+#include <iostream>
+#include <stdlib.h>
+#include <rwlock.h>
+
+using namespace std;
+using namespace rwlock;
+
+char *name;
+
+void usage()
+{
+	cout << "Usage " << name << " which_lock_to_use which_side_to_use lock_or_unlock\n" <<
+			"   which_lock_to_use: 1=VSS 2=ExtentMap 3=FreeList 4=VBBM 5=CopyLocks\n" <<
+			"   which_side_to_use: r|w   (read or write)\n" <<
+			"   lock_or_unlock:    l|u   (lock or unlock)\n";
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	uint32_t which_lock;  // 1-5
+	uint32_t which_side;  // 0 or 1
+	uint32_t lock_unlock;  // 0 or 1
+	RWLock *rwlock;
+
+	name = argv[0];
+
+	if (argc != 4)
+		usage();
+	if (strlen(argv[1]) != 1 || strlen(argv[2]) != 1 || strlen(argv[3]) != 1)
+		usage();
+
+	which_lock = atoi(argv[1]);
+	if (which_lock < 1 || which_lock > 5)
+		usage();
+
+	if (argv[2][0] == 'r')
+		which_side = 0;
+	else if (argv[2][0] == 'w')
+		which_side = 1;
+	else
+		usage();
+
+	if (argv[3][0] == 'l')
+		lock_unlock = 0;
+	else if (argv[3][0] == 'u')
+		lock_unlock = 1;
+	else
+		usage();
+
+	rwlock = new RWLock(0x10000 * which_lock);
+	if (which_side == 0)
+		if (lock_unlock == 0)
+			rwlock->read_lock();
+		else
+			rwlock->read_unlock();
+	else
+		if (lock_unlock == 0)
+			rwlock->write_lock();
+		else
+			rwlock->write_unlock();
+
+	return 0;
+}