[Minios-devel] [UNIKRAFT PATCH v2 1/1] arch: Add empty spinlocks

[Yuri Volchkov <yuri.volchkov@xxxxxxxxx>]

From: Costin Lupu <costin.lupu@xxxxxxxxx>

We use empty spinlocks for indicating where synchronization is
required.  The spinlocks operations should be extended when Unikraft
will have SMP support.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
Signed-off-by: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
---
 include/uk/arch/spinlock.h | 54 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 include/uk/arch/spinlock.h

diff --git a/include/uk/arch/spinlock.h b/include/uk/arch/spinlock.h
new file mode 100644
index 0000000..5ccfbf4
--- /dev/null
+++ b/include/uk/arch/spinlock.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR 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 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.
+ */
+/* Taken from Mini-OS */
+
+#ifndef __UKARCH_SPINLOCK_H__
+#define __UKARCH_SPINLOCK_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {} spinlock_t;
+
+#ifdef CONFIG_SMP
+#error "Define your spinlock operations!"
+#else
+
+#define ukarch_spin_lock_init(lock)      do {} while (0)
+#define ukarch_spin_is_locked(lock)      do {} while (0)
+#define ukarch_spin_unlock_wait(lock)    do {} while (0)
+#define ukarch_spin_lock(lock)           do {} while (0)
+#define ukarch_spin_unlock(lock)         do {} while (0)
+
+/* Defines a preinitialized spinlock in unlocked state */
+#define DEFINE_SPINLOCK(lock)            do {} while (0)
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __UKARCH_SPINLOCK_H__ */
-- 
2.17.1


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