Move struct ltt_channel to shm for consumer flush

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

diff --git a/liblttng-ust/ltt-ring-buffer-metadata-client.h b/liblttng-ust/ltt-ring-buffer-metadata-client.h
index 4f2620e0a5426441b5aeb9a6e307e80199bfd388..46aab3cce8d87d9300f2fcd032717e6a00cfd689 100644 (file)
--- a/liblttng-ust/ltt-ring-buffer-metadata-client.h
+++ b/liblttng-ust/ltt-ring-buffer-metadata-client.h
@@ -88,10 +88,9 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, u64 tsc,
                                subbuf_idx * chan->backend.subbuf_size,
                                handle);
        struct ltt_channel *ltt_chan = channel_get_private(chan);
-       struct ltt_session *session = ltt_chan->session;
 
        header->magic = TSDL_MAGIC_NUMBER;
-       memcpy(header->uuid, session->uuid, sizeof(session->uuid));
+       memcpy(header->uuid, ltt_chan->uuid, sizeof(ltt_chan->uuid));
        header->checksum = 0;           /* 0 if unused */
        header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
        header->packet_size = 0xFFFFFFFF;  /* in bits, for debugging */
@@ -165,19 +164,26 @@ const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &clie
 
 static
 struct ltt_channel *_channel_create(const char *name,
-                               struct ltt_channel *ltt_chan, void *buf_addr,
+                               void *buf_addr,
                                size_t subbuf_size, size_t num_subbuf,
                                unsigned int switch_timer_interval,
                                unsigned int read_timer_interval,
                                int *shm_fd, int *wait_fd,
                                uint64_t *memory_map_size)
 {
-       ltt_chan->handle = channel_create(&client_config, name, ltt_chan, buf_addr,
-                             subbuf_size, num_subbuf, switch_timer_interval,
-                             read_timer_interval, shm_fd, wait_fd,
-                             memory_map_size);
-       if (!ltt_chan->handle)
+       void *priv;
+       struct ltt_channel *ltt_chan = NULL;
+       struct lttng_ust_shm_handle *handle;
+
+       handle = channel_create(&client_config, name,
+                       &priv, __alignof__(*ltt_chan), sizeof(*ltt_chan),
+                       buf_addr, subbuf_size, num_subbuf,
+                       switch_timer_interval, read_timer_interval,
+                       shm_fd, wait_fd, memory_map_size);
+       if (!handle)
                return NULL;
+       ltt_chan = priv;
+       ltt_chan->handle = handle;
        ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan);
        return ltt_chan;
 }