Remove inappropriate \n from easy-ust sample

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

diff --git a/libringbuffer/frontend_api.h b/libringbuffer/frontend_api.h
index 31072b6b3895edae8d61bb86a2affc3f3caa1b92..6a06bba2c2393ba139bc506a8f88bb4027b59ea9 100644 (file)
--- a/libringbuffer/frontend_api.h
+++ b/libringbuffer/frontend_api.h
@@ -1,24 +1,36 @@
-#ifndef _LINUX_RING_BUFFER_FRONTEND_API_H
-#define _LINUX_RING_BUFFER_FRONTEND_API_H
+#ifndef _LTTNG_RING_BUFFER_FRONTEND_API_H
+#define _LTTNG_RING_BUFFER_FRONTEND_API_H
 
 /*
- * linux/ringbuffer/frontend_api.h
+ * libringbuffer/frontend_api.h
  *
- * (C) Copyright 2005-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * 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 Library Synchronization Header (buffer write API).
  *
  * Author:
- *     Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * See ring_buffer_frontend.c for more information on wait-free algorithms.
- * See linux/ringbuffer/frontend.h for channel allocation and read-side API.
+ *      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * See ring_buffer_frontend.c for more information on wait-free
+ * algorithms.
+ * See frontend.h for channel allocation and read-side API.
  */
 
 #include "frontend.h"
-#include "ust/core.h"
 #include <urcu-bp.h>
 #include <urcu/compiler.h>
 
@@ -42,11 +54,11 @@ int lib_ring_buffer_get_cpu(const struct lttng_ust_lib_ring_buffer_config *confi
        int cpu, nesting;
 
        rcu_read_lock();
-       cpu = ust_get_cpu();
+       cpu = lttng_ust_get_cpu();
        nesting = ++lib_ring_buffer_nesting;    /* TLS */
        cmm_barrier();
 
-       if (unlikely(nesting > 4)) {
+       if (caa_unlikely(nesting > 4)) {
                WARN_ON_ONCE(1);
                lib_ring_buffer_nesting--;      /* TLS */
                rcu_read_unlock();
@@ -97,7 +109,7 @@ int lib_ring_buffer_try_reserve(const struct lttng_ust_lib_ring_buffer_config *c
        if (last_tsc_overflow(config, buf, ctx->tsc))
                ctx->rflags |= RING_BUFFER_RFLAG_FULL_TSC;
 
-       if (unlikely(subbuf_offset(*o_begin, chan) == 0))
+       if (caa_unlikely(subbuf_offset(*o_begin, chan) == 0))
                return 1;
 
        ctx->slot_size = record_header_size(config, chan, *o_begin,
@@ -105,7 +117,7 @@ int lib_ring_buffer_try_reserve(const struct lttng_ust_lib_ring_buffer_config *c
        ctx->slot_size +=
                lib_ring_buffer_align(*o_begin + ctx->slot_size,
                                      ctx->largest_align) + ctx->data_size;
-       if (unlikely((subbuf_offset(*o_begin, chan) + ctx->slot_size)
+       if (caa_unlikely((subbuf_offset(*o_begin, chan) + ctx->slot_size)
                     > chan->backend.subbuf_size))
                return 1;
 
@@ -115,7 +127,7 @@ int lib_ring_buffer_try_reserve(const struct lttng_ust_lib_ring_buffer_config *c
         */
        *o_end = *o_begin + ctx->slot_size;
 
-       if (unlikely((subbuf_offset(*o_end, chan)) == 0))
+       if (caa_unlikely((subbuf_offset(*o_end, chan)) == 0))
                /*
                 * The offset_end will fall at the very beginning of the next
                 * subbuffer.
@@ -165,11 +177,11 @@ int lib_ring_buffer_reserve(const struct lttng_ust_lib_ring_buffer_config *confi
        /*
         * Perform retryable operations.
         */
-       if (unlikely(lib_ring_buffer_try_reserve(config, ctx, &o_begin,
+       if (caa_unlikely(lib_ring_buffer_try_reserve(config, ctx, &o_begin,
                                                 &o_end, &o_old, &before_hdr_pad)))
                goto slow_path;
 
-       if (unlikely(v_cmpxchg(config, &ctx->buf->offset, o_old, o_end)
+       if (caa_unlikely(v_cmpxchg(config, &ctx->buf->offset, o_old, o_end)
                     != o_old))
                goto slow_path;
 
@@ -317,7 +329,7 @@ int lib_ring_buffer_try_discard_reserve(const struct lttng_ust_lib_ring_buffer_c
         */
        save_last_tsc(config, buf, 0ULL);
 
-       if (likely(v_cmpxchg(config, &buf->offset, end_offset, ctx->pre_offset)
+       if (caa_likely(v_cmpxchg(config, &buf->offset, end_offset, ctx->pre_offset)
                   != end_offset))
                return -EPERM;
        else
@@ -352,4 +364,4 @@ void lib_ring_buffer_record_enable(const struct lttng_ust_lib_ring_buffer_config
        uatomic_dec(&buf->record_disabled);
 }
 
-#endif /* _LINUX_RING_BUFFER_FRONTEND_API_H */
+#endif /* _LTTNG_RING_BUFFER_FRONTEND_API_H */