cleanup: function attribute 'hidden'

[lttng-ust.git] / liblttng-ust / lttng-ring-buffer-metadata-client.h

diff --git a/liblttng-ust/lttng-ring-buffer-metadata-client.h b/liblttng-ust/lttng-ring-buffer-metadata-client.h
index 403652031ae1a3645376ce6d020de2d1a9b177d0..f4d1362a6e9b95303349483a574842815a96ed77 100644 (file)
--- a/liblttng-ust/lttng-ring-buffer-metadata-client.h
+++ b/liblttng-ust/lttng-ring-buffer-metadata-client.h
@@ -6,6 +6,7 @@
  * LTTng lib ring buffer client template.
  */
 
+#include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ -14,6 +15,7 @@
 #include "ust-compat.h"
 #include "lttng-tracer.h"
 #include "../libringbuffer/frontend_types.h"
+#include <urcu/tls-compat.h>
 
 struct metadata_packet_header {
        uint32_t magic;                 /* 0x75D11D57 */
@@ -35,6 +37,9 @@ struct metadata_record_header {
 
 static const struct lttng_ust_lib_ring_buffer_config client_config;
 
+/* No nested use supported for metadata ring buffer. */
+static DEFINE_URCU_TLS(struct lttng_ust_lib_ring_buffer_ctx_private, private_ctx);
+
 static inline uint64_t lib_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan)
 {
        return 0;
@@ -223,7 +228,7 @@ struct lttng_ust_channel_buffer *_channel_create(const char *name,
                        stream_fds, nr_stream_fds, blocking_timeout);
        if (!handle)
                goto error;
-       lttng_chan_buf->chan = shmp(handle, handle->chan);
+       lttng_chan_buf->priv->rb_chan = shmp(handle, handle->chan);
        return lttng_chan_buf;
 
 error:
@@ -234,20 +239,24 @@ error:
 static
 void lttng_channel_destroy(struct lttng_ust_channel_buffer *lttng_chan_buf)
 {
-       channel_destroy(lttng_chan_buf->chan, lttng_chan_buf->chan->handle, 1);
+       channel_destroy(lttng_chan_buf->priv->rb_chan, lttng_chan_buf->priv->rb_chan->handle, 1);
        lttng_ust_free_channel_common(lttng_chan_buf->parent);
 }
 
 static
-int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id)
+int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx)
 {
        int ret;
 
+       memset(&URCU_TLS(private_ctx), 0, sizeof(struct lttng_ust_lib_ring_buffer_ctx_private));
+       URCU_TLS(private_ctx).pub = ctx;
+       URCU_TLS(private_ctx).chan = ctx->client_priv;
+       ctx->priv = &URCU_TLS(private_ctx);
        ret = lib_ring_buffer_reserve(&client_config, ctx, NULL);
        if (ret)
                return ret;
        if (lib_ring_buffer_backend_get_pages(&client_config, ctx,
-                       &ctx->backend_pages))
+                       &ctx->priv->backend_pages))
                return -EPERM;
        return 0;
 }
@@ -259,68 +268,59 @@ void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx)
 }
 
 static
-void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src,
-                    size_t len)
+void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx,
+               const void *src, size_t len, size_t alignment)
 {
+       lttng_ust_lib_ring_buffer_align_ctx(ctx, alignment);
        lib_ring_buffer_write(&client_config, ctx, src, len);
 }
 
 static
-size_t lttng_packet_avail_size(struct lttng_ust_lib_ring_buffer_channel *chan,
-               struct lttng_ust_shm_handle *handle)
+size_t lttng_packet_avail_size(struct lttng_ust_channel_buffer *chan)
 {
+       struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan;
        unsigned long o_begin;
        struct lttng_ust_lib_ring_buffer *buf;
 
-       buf = shmp(handle, chan->backend.buf[0].shmp);  /* Only for global buffer ! */
+       buf = shmp(rb_chan->handle, rb_chan->backend.buf[0].shmp);      /* Only for global buffer ! */
        o_begin = v_read(&client_config, &buf->offset);
-       if (subbuf_offset(o_begin, chan) != 0) {
-               return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
+       if (subbuf_offset(o_begin, rb_chan) != 0) {
+               return rb_chan->backend.subbuf_size - subbuf_offset(o_begin, rb_chan);
        } else {
-               return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
+               return rb_chan->backend.subbuf_size - subbuf_offset(o_begin, rb_chan)
                        - sizeof(struct metadata_packet_header);
        }
 }
 
-#if 0
 static
-wait_queue_head_t *lttng_get_reader_wait_queue(struct lttng_ust_lib_ring_buffer_channel *chan)
+int lttng_is_finalized(struct lttng_ust_channel_buffer *chan)
 {
-       return &chan->read_wait;
-}
+       struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan;
 
-static
-wait_queue_head_t *lttng_get_hp_wait_queue(struct lttng_ust_lib_ring_buffer_channel *chan)
-{
-       return &chan->hp_wait;
+       return lib_ring_buffer_channel_is_finalized(rb_chan);
 }
-#endif //0
 
 static
-int lttng_is_finalized(struct lttng_ust_lib_ring_buffer_channel *chan)
+int lttng_is_disabled(struct lttng_ust_channel_buffer *chan)
 {
-       return lib_ring_buffer_channel_is_finalized(chan);
-}
+       struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan;
 
-static
-int lttng_is_disabled(struct lttng_ust_lib_ring_buffer_channel *chan)
-{
-       return lib_ring_buffer_channel_is_disabled(chan);
+       return lib_ring_buffer_channel_is_disabled(rb_chan);
 }
 
 static
-int lttng_flush_buffer(struct lttng_ust_lib_ring_buffer_channel *chan,
-               struct lttng_ust_shm_handle *handle)
+int lttng_flush_buffer(struct lttng_ust_channel_buffer *chan)
 {
+       struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan;
        struct lttng_ust_lib_ring_buffer *buf;
        int shm_fd, wait_fd, wakeup_fd;
        uint64_t memory_map_size;
 
-       buf = channel_get_ring_buffer(&client_config, chan,
-                       0, handle, &shm_fd, &wait_fd, &wakeup_fd,
+       buf = channel_get_ring_buffer(&client_config, rb_chan,
+                       0, rb_chan->handle, &shm_fd, &wait_fd, &wakeup_fd,
                        &memory_map_size);
        lib_ring_buffer_switch(&client_config, buf,
-                       SWITCH_ACTIVE, handle);
+                       SWITCH_ACTIVE, rb_chan->handle);
        return 0;
 }