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-rw-r--r--src/vppinfra/lock.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/src/vppinfra/lock.h b/src/vppinfra/lock.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_clib_lock_h
+#define included_clib_lock_h
+
+#include <vppinfra/clib.h>
+
+typedef struct
+{
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
+ u32 lock;
+#if CLIB_DEBUG > 0
+ pid_t pid;
+ uword cpu_index;
+ void *frame_address;
+#endif
+} *clib_spinlock_t;
+
+static inline void
+clib_spinlock_init (clib_spinlock_t * p)
+{
+ *p = clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES);
+ memset ((void *) *p, 0, CLIB_CACHE_LINE_BYTES);
+}
+
+static inline void
+clib_spinlock_free (clib_spinlock_t * p)
+{
+ if (*p)
+ {
+ clib_mem_free ((void *) *p);
+ *p = 0;
+ }
+}
+
+static_always_inline void
+clib_spinlock_lock (clib_spinlock_t * p)
+{
+ while (__sync_lock_test_and_set (&(*p)->lock, 1))
+#if __x86_64__
+ __builtin_ia32_pause ()
+#endif
+ ;
+#if CLIB_DEBUG > 0
+ (*p)->frame_address = __builtin_frame_address (0);
+ (*p)->pid = getpid ();
+ (*p)->cpu_index = os_get_cpu_number ();
+#endif
+}
+
+static_always_inline void
+clib_spinlock_lock_if_init (clib_spinlock_t * p)
+{
+ if (PREDICT_FALSE (*p != 0))
+ clib_spinlock_lock (p);
+}
+
+static_always_inline void
+clib_spinlock_unlock (clib_spinlock_t * p)
+{
+ (*p)->lock = 0;
+#if CLIB_DEBUG > 0
+ (*p)->frame_address = 0;
+ (*p)->pid = 0;
+ (*p)->cpu_index = 0;
+#endif
+}
+
+static_always_inline void
+clib_spinlock_unlock_if_init (clib_spinlock_t * p)
+{
+ if (PREDICT_FALSE (*p != 0))
+ clib_spinlock_unlock (p);
+}
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */