1 files changed, 100 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_spinlock.c b/lib/libpthread/thread/thr_spinlock.c
new file mode 100644
index 0000000..56691dd
--- /dev/null
+++ b/lib/libpthread/thread/thr_spinlock.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by John Birrell.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+
+#include <sys/types.h>
+#include <machine/atomic.h>
+
+#include <libc_private.h>
+#include "spinlock.h"
+#include "thr_private.h"
+
+/*
+ * These are for compatability only.  Spinlocks of this type
+ * are deprecated.
+ */
+
+void
+_spinunlock(spinlock_t *lck)
+{
+	kse_critical_t crit;
+
+	crit = (kse_critical_t)lck->fname;
+	atomic_store_rel_long(&lck->access_lock, 0);
+	if (crit != NULL)
+		_kse_critical_leave(crit);
+}
+
+
+/*
+ * Lock a location for the running thread. Yield to allow other
+ * threads to run if this thread is blocked because the lock is
+ * not available. Note that this function does not sleep. It
+ * assumes that the lock will be available very soon.
+ */
+void
+_spinlock(spinlock_t *lck)
+{
+	kse_critical_t crit;
+
+	/*
+	 * Try to grab the lock and loop if another thread grabs
+	 * it before we do.
+	 */
+	if (_kse_isthreaded())
+		crit = _kse_critical_enter();
+	else
+		crit = NULL;
+	while(_atomic_lock(&lck->access_lock)) {
+		while (lck->access_lock)
+			;
+	}
+	lck->fname = (char *)crit;
+}
+
+/*
+ * Lock a location for the running thread. Yield to allow other
+ * threads to run if this thread is blocked because the lock is
+ * not available. Note that this function does not sleep. It
+ * assumes that the lock will be available very soon.
+ *
+ * This function checks if the running thread has already locked the
+ * location, warns if this occurs and creates a thread dump before
+ * returning.
+ */
+void
+_spinlock_debug(spinlock_t *lck, char *fname, int lineno)
+{
+	_spinlock(lck);
+}