Updated structure and added makefile

core/spinlock.c

@@ -0,0 +1,98 @@
+/*
+ * This file is distributed as part of the SkySQL Gateway.  It 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.
+ *
+ * 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.
+ *
+ * Copyright SkySQL Ab 2013
+ */
+
+/*
+ * spinlock.c  -  Spinlock operations for the SkySQL Gateway
+ *
+ * Revision History
+ *
+ * Date		Who		Description
+ * 10/06/13	Mark Riddoch	Initial implementation
+ *
+ */
+
+#include <spinlock.h>
+#include <atomic.h>
+
+/*
+ * Initialise a spinlock.
+ *
+ * @param lock The spinlock to initialise.
+ */
+void
+spinlock_init(SPINLOCK *lock)
+{
+	lock->lock = 0;
+#ifdef DEBUG
+	lock->spins = 0;
+	lock->acquired = 0;
+#endif
+}
+
+/*
+ * Acquire a spinlock.
+ *
+ * @param lock The spinlock to acquire
+ */
+void
+spinlock_acquire(SPINLOCK *lock)
+{
+	while (atomic_add(&(lock->lock), 1) != 0)
+	{
+		atomic_add(&(lock->lock), -1);
+#ifdef DEBUG
+		atomic_add(&(lock->spins), 1);
+#endif
+	}
+#ifdef DEBUG
+	lock->acquired++;
+	lock->owner = THREAD_SHELF();
+#endif
+}
+
+/*
+ * Acquire a spinlock if it is not already locked.
+ *
+ * @param lock The spinlock to acquire
+ * @return True ifthe spinlock was acquired, otherwise false
+ */
+int
+spinlock_acquire_nowait(SPINLOCK *lock)
+{
+	if (atomic_add(&(lock->lock), 1) != 0)
+	{
+		atomic_add(&(lock->lock), -1);
+		return FALSE;
+	}
+#ifdef DEBUG
+	lock->acquired++;
+	lock->owner = THREAD_SHELF();
+#endif
+	return TRUE;
+}
+
+/*
+ * Release a spinlock.
+ *
+ * @param lock The spinlock to release
+ */
+void
+spinlock_release(SPINLOCK *lock)
+{
+	atomic_add(&(lock->lock), -1);
+}