X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=libringbuffer%2Fbackend_internal.h;h=b8a1699046ff293fc8fc0c2df447fd419753e7a5;hb=071dec4386ff4c89d8b0f92ab1a8dbf079abd50c;hp=90088b89c7a8ffbfb81eac3efedad3cbefbb6f8e;hpb=a3492932cffa2c9dfbc9416792b20ce763708fc1;p=lttng-ust.git

diff --git a/libringbuffer/backend_internal.h b/libringbuffer/backend_internal.h
index 90088b89..b8a16990 100644
--- a/libringbuffer/backend_internal.h
+++ b/libringbuffer/backend_internal.h
@@ -1,28 +1,16 @@
-#ifndef _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
-#define _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
-
 /*
- * libringbuffer/backend_internal.h
- *
- * Ring buffer backend (internal helpers).
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
  * Copyright (C) 2005-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Ring buffer backend (internal helpers).
  */
 
+#ifndef _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
+#define _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
+
+#include <stddef.h>
+#include <stdint.h>
 #include <unistd.h>
 #include <urcu/compiler.h>
 
@@ -30,33 +18,44 @@
 #include "backend_types.h"
 #include "frontend_types.h"
 #include "shm.h"
+#include "ust-helper.h"
 
 /* Ring buffer backend API presented to the frontend */
 
 /* Ring buffer and channel backend create/free */
 
+LTTNG_HIDDEN
 int lib_ring_buffer_backend_create(struct lttng_ust_lib_ring_buffer_backend *bufb,
 				   struct channel_backend *chan, int cpu,
 				   struct lttng_ust_shm_handle *handle,
 				   struct shm_object *shmobj);
+LTTNG_HIDDEN
 void channel_backend_unregister_notifiers(struct channel_backend *chanb);
+LTTNG_HIDDEN
 void lib_ring_buffer_backend_free(struct lttng_ust_lib_ring_buffer_backend *bufb);
+LTTNG_HIDDEN
 int channel_backend_init(struct channel_backend *chanb,
 			 const char *name,
 			 const struct lttng_ust_lib_ring_buffer_config *config,
 			 size_t subbuf_size,
 			 size_t num_subbuf, struct lttng_ust_shm_handle *handle,
 			 const int *stream_fds);
+LTTNG_HIDDEN
 void channel_backend_free(struct channel_backend *chanb,
 			  struct lttng_ust_shm_handle *handle);
 
+LTTNG_HIDDEN
 void lib_ring_buffer_backend_reset(struct lttng_ust_lib_ring_buffer_backend *bufb,
 				   struct lttng_ust_shm_handle *handle);
+LTTNG_HIDDEN
 void channel_backend_reset(struct channel_backend *chanb);
 
+LTTNG_HIDDEN
 int lib_ring_buffer_backend_init(void);
+LTTNG_HIDDEN
 void lib_ring_buffer_backend_exit(void);
 
+LTTNG_HIDDEN
 extern void _lib_ring_buffer_write(struct lttng_ust_lib_ring_buffer_backend *bufb,
 				   size_t offset, const void *src, size_t len,
 				   ssize_t pagecpy);
@@ -592,6 +591,28 @@ int update_read_sb_index(const struct lttng_ust_lib_ring_buffer_config *config,
 #define inline_memcpy(dest, src, n)	memcpy(dest, src, n)
 #endif
 
+static inline __attribute__((always_inline))
+void lttng_inline_memcpy(void *dest, const void *src,
+		unsigned long len)
+{
+	switch (len) {
+	case 1:
+		*(uint8_t *) dest = *(const uint8_t *) src;
+		break;
+	case 2:
+		*(uint16_t *) dest = *(const uint16_t *) src;
+		break;
+	case 4:
+		*(uint32_t *) dest = *(const uint32_t *) src;
+		break;
+	case 8:
+		*(uint64_t *) dest = *(const uint64_t *) src;
+		break;
+	default:
+		inline_memcpy(dest, src, len);
+	}
+}
+
 /*
  * Use the architecture-specific memcpy implementation for constant-sized
  * inputs, but rely on an inline memcpy for length statically unknown.
@@ -603,7 +624,7 @@ do {								\
 	if (__builtin_constant_p(len))				\
 		memcpy(dest, src, __len);			\
 	else							\
-		inline_memcpy(dest, src, __len);		\
+		lttng_inline_memcpy(dest, src, __len);		\
 } while (0)
 
 /*