Remove gettid warning

[lttng-ust.git] / libringbuffer / backend_internal.h

diff --git a/libringbuffer/backend_internal.h b/libringbuffer/backend_internal.h
index 16d8598525172188aa505627a06932e578b3fe52..050c98ac530dfc34f267ff9f23cb9bf8db84bbfd 100644 (file)
--- a/libringbuffer/backend_internal.h
+++ b/libringbuffer/backend_internal.h
@@ -1,20 +1,32 @@
-#ifndef _LINUX_RING_BUFFER_BACKEND_INTERNAL_H
-#define _LINUX_RING_BUFFER_BACKEND_INTERNAL_H
+#ifndef _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
+#define _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
 
 /*
- * linux/ringbuffer/backend_internal.h
- *
- * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * libringbuffer/backend_internal.h
  *
  * Ring buffer backend (internal helpers).
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * 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
  */
 
 #include <unistd.h>
 #include <urcu/compiler.h>
 
-#include <ust/ringbuffer-config.h>
+#include <lttng/ringbuffer-config.h>
 #include "backend_types.h"
 #include "frontend_types.h"
 #include "shm.h"
@@ -32,7 +44,7 @@ void lib_ring_buffer_backend_free(struct lttng_ust_lib_ring_buffer_backend *bufb
 int channel_backend_init(struct channel_backend *chanb,
                         const char *name,
                         const struct lttng_ust_lib_ring_buffer_config *config,
-                        void *priv, size_t subbuf_size,
+                        size_t subbuf_size,
                         size_t num_subbuf, struct lttng_ust_shm_handle *handle);
 void channel_backend_free(struct channel_backend *chanb,
                          struct lttng_ust_shm_handle *handle);
@@ -318,7 +330,7 @@ void lib_ring_buffer_clear_noref(const struct lttng_ust_lib_ring_buffer_config *
        id = CMM_ACCESS_ONCE(shmp_index(handle, bufb->buf_wsb, idx)->id);
        for (;;) {
                /* This check is called on the fast path for each record. */
-               if (likely(!subbuffer_id_is_noref(config, id))) {
+               if (caa_likely(!subbuffer_id_is_noref(config, id))) {
                        /*
                         * Store after load dependency ordering the writes to
                         * the subbuffer after load and test of the noref flag
@@ -330,7 +342,7 @@ void lib_ring_buffer_clear_noref(const struct lttng_ust_lib_ring_buffer_config *
                new_id = id;
                subbuffer_id_clear_noref(config, &new_id);
                new_id = uatomic_cmpxchg(&shmp_index(handle, bufb->buf_wsb, idx)->id, id, new_id);
-               if (likely(new_id == id))
+               if (caa_likely(new_id == id))
                        break;
                id = new_id;
        }
@@ -391,13 +403,13 @@ int update_read_sb_index(const struct lttng_ust_lib_ring_buffer_config *config,
                 * following cmpxchg().
                 */
                old_id = shmp_index(handle, bufb->buf_wsb, consumed_idx)->id;
-               if (unlikely(!subbuffer_id_is_noref(config, old_id)))
+               if (caa_unlikely(!subbuffer_id_is_noref(config, old_id)))
                        return -EAGAIN;
                /*
                 * Make sure the offset count we are expecting matches the one
                 * indicated by the writer.
                 */
-               if (unlikely(!subbuffer_id_compare_offset(config, old_id,
+               if (caa_unlikely(!subbuffer_id_compare_offset(config, old_id,
                                                          consumed_count)))
                        return -EAGAIN;
                CHAN_WARN_ON(shmp(handle, bufb->chan),
@@ -406,7 +418,7 @@ int update_read_sb_index(const struct lttng_ust_lib_ring_buffer_config *config,
                                              consumed_count);
                new_id = uatomic_cmpxchg(&shmp_index(handle, bufb->buf_wsb, consumed_idx)->id, old_id,
                                 bufb->buf_rsb.id);
-               if (unlikely(old_id != new_id))
+               if (caa_unlikely(old_id != new_id))
                        return -EAGAIN;
                bufb->buf_rsb.id = new_id;
        } else {
@@ -416,6 +428,10 @@ int update_read_sb_index(const struct lttng_ust_lib_ring_buffer_config *config,
        return 0;
 }
 
+#ifndef inline_memcpy
+#define inline_memcpy(dest, src, n)    memcpy(dest, src, n)
+#endif
+
 /*
  * Use the architecture-specific memcpy implementation for constant-sized
  * inputs, but rely on an inline memcpy for length statically unknown.
@@ -430,4 +446,45 @@ do {                                                               \
                inline_memcpy(dest, src, __len);                \
 } while (0)
 
-#endif /* _LINUX_RING_BUFFER_BACKEND_INTERNAL_H */
+/* arch-agnostic implementation */
+
+static inline int lttng_ust_fls(unsigned int x)
+{
+       int r = 32;
+
+       if (!x)
+               return 0;
+       if (!(x & 0xFFFF0000U)) {
+               x <<= 16;
+               r -= 16;
+       }
+       if (!(x & 0xFF000000U)) {
+               x <<= 8;
+               r -= 8;
+       }
+       if (!(x & 0xF0000000U)) {
+               x <<= 4;
+               r -= 4;
+       }
+       if (!(x & 0xC0000000U)) {
+               x <<= 2;
+               r -= 2;
+       }
+       if (!(x & 0x80000000U)) {
+               x <<= 1;
+               r -= 1;
+       }
+       return r;
+}
+
+static inline int get_count_order(unsigned int count)
+{
+       int order;
+
+       order = lttng_ust_fls(count) - 1;
+       if (count & (count - 1))
+               order++;
+       return order;
+}
+
+#endif /* _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H */