Move LTTng-UST buffer ownership from application to consumer

[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 8bffe547bf43fae733c97149fc1b7ae74743b0cc..1e1b8a766b63b3e8b82fd5597eaad675a095f463 100644 (file)
--- a/liblttng-ust/lttng-ring-buffer-metadata-client.h
+++ b/liblttng-ust/lttng-ring-buffer-metadata-client.h
@@ -110,7 +110,6 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t
        header->checksum_scheme = 0;    /* 0 if unused */
        header->major = CTF_SPEC_MAJOR;
        header->minor = CTF_SPEC_MINOR;
-
 }
 
 /*
@@ -183,54 +182,32 @@ struct lttng_channel *_channel_create(const char *name,
                                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,
-                               struct lttng_channel *chan_priv_init)
+                               unsigned char *uuid)
 {
-       void *priv;
-       struct lttng_channel *lttng_chan = NULL;
+       struct lttng_channel chan_priv_init;
        struct lttng_ust_shm_handle *handle;
+       struct lttng_channel *lttng_chan;
+       void *priv;
 
+       memset(&chan_priv_init, 0, sizeof(chan_priv_init));
+       memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN);
        handle = channel_create(&client_config, name,
                        &priv, __alignof__(*lttng_chan), sizeof(*lttng_chan),
-                       chan_priv_init,
+                       &chan_priv_init,
                        buf_addr, subbuf_size, num_subbuf,
-                       switch_timer_interval, read_timer_interval,
-                       shm_fd, wait_fd, memory_map_size);
+                       switch_timer_interval, read_timer_interval);
        if (!handle)
                return NULL;
        lttng_chan = priv;
        lttng_chan->handle = handle;
-       lttng_chan->chan = shmp(lttng_chan->handle, lttng_chan->handle->chan);
+       lttng_chan->chan = shmp(handle, handle->chan);
        return lttng_chan;
 }
 
 static
-void lttng_channel_destroy(struct lttng_channel *lttng_chan)
-{
-       channel_destroy(lttng_chan->chan, lttng_chan->handle, 0);
-}
-
-static
-struct lttng_ust_lib_ring_buffer *lttng_buffer_read_open(struct channel *chan,
-                                            struct lttng_ust_shm_handle *handle,
-                                            int **shm_fd, int **wait_fd,
-                                            uint64_t **memory_map_size)
-{
-       struct lttng_ust_lib_ring_buffer *buf;
-
-       buf = channel_get_ring_buffer(&client_config, chan,
-                       0, handle, shm_fd, wait_fd, memory_map_size);
-       if (!lib_ring_buffer_open_read(buf, handle, 0))
-               return buf;
-       return NULL;
-}
-
-static
-void lttng_buffer_read_close(struct lttng_ust_lib_ring_buffer *buf,
-                          struct lttng_ust_shm_handle *handle)
+void lttng_channel_destroy(struct lttng_channel *chan)
 {
-       lib_ring_buffer_release_read(buf, handle, 0);
+       channel_destroy(chan->chan, chan->handle, 1);
 }
 
 static
@@ -299,11 +276,11 @@ static
 int lttng_flush_buffer(struct channel *chan, struct lttng_ust_shm_handle *handle)
 {
        struct lttng_ust_lib_ring_buffer *buf;
-       int *shm_fd, *wait_fd;
-       uint64_t *memory_map_size;
+       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,
+                       0, handle, &shm_fd, &wait_fd, &wakeup_fd,
                        &memory_map_size);
        lib_ring_buffer_switch(&client_config, buf,
                        SWITCH_ACTIVE, handle);
@@ -315,8 +292,6 @@ static struct lttng_transport lttng_relay_transport = {
        .ops = {
                .channel_create = _channel_create,
                .channel_destroy = lttng_channel_destroy,
-               .buffer_read_open = lttng_buffer_read_open,
-               .buffer_read_close = lttng_buffer_read_close,
                .event_reserve = lttng_event_reserve,
                .event_commit = lttng_event_commit,
                .event_write = lttng_event_write,
@@ -327,6 +302,7 @@ static struct lttng_transport lttng_relay_transport = {
                .is_disabled = lttng_is_disabled,
                .flush_buffer = lttng_flush_buffer,
        },
+       .client_config = &client_config,
 };
 
 void RING_BUFFER_MODE_TEMPLATE_INIT(void)