libust ABI: export streams

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

diff --git a/libust/ltt-ring-buffer-metadata-client.h b/libust/ltt-ring-buffer-metadata-client.h
index 1ea41176b123ece92d855fb80cd022cef52f0256..dd168465655f5a646c8c62f4a3ded71210c03e26 100644 (file)
--- a/libust/ltt-ring-buffer-metadata-client.h
+++ b/libust/ltt-ring-buffer-metadata-client.h
@@ -9,8 +9,8 @@
  */
 
 #include <stdint.h>
+#include <ust/lttng-events.h>
 #include "ust/bitfield.h"
-#include "ltt-events.h"
 #include "ltt-tracer.h"
 #include "../libringbuffer/frontend_types.h"
 
@@ -76,13 +76,15 @@ static size_t client_packet_header_size(void)
 }
 
 static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
-                               unsigned int subbuf_idx)
+                               unsigned int subbuf_idx,
+                               struct shm_handle *handle)
 {
-       struct channel *chan = shmp(buf->backend.chan);
+       struct channel *chan = shmp(handle, buf->backend.chan);
        struct metadata_packet_header *header =
                (struct metadata_packet_header *)
                        lib_ring_buffer_offset_address(&buf->backend,
-                               subbuf_idx * chan->backend.subbuf_size);
+                               subbuf_idx * chan->backend.subbuf_size,
+                               handle);
        struct ltt_channel *ltt_chan = channel_get_private(chan);
        struct ltt_session *session = ltt_chan->session;
 
@@ -101,13 +103,15 @@ static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
  * subbuffer. data_size is between 1 and subbuf_size.
  */
 static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc,
-                             unsigned int subbuf_idx, unsigned long data_size)
+                             unsigned int subbuf_idx, unsigned long data_size,
+                             struct shm_handle *handle)
 {
-       struct channel *chan = shmp(buf->backend.chan);
+       struct channel *chan = shmp(handle, buf->backend.chan);
        struct metadata_packet_header *header =
                (struct metadata_packet_header *)
                        lib_ring_buffer_offset_address(&buf->backend,
-                               subbuf_idx * chan->backend.subbuf_size);
+                               subbuf_idx * chan->backend.subbuf_size,
+                               handle);
        unsigned long records_lost = 0;
 
        header->content_size = data_size * CHAR_BIT;            /* in bits */
@@ -119,12 +123,15 @@ static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc,
 }
 
 static int client_buffer_create(struct lib_ring_buffer *buf, void *priv,
-                               int cpu, const char *name)
+                               int cpu, const char *name,
+                               struct shm_handle *handle)
 {
        return 0;
 }
 
-static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int cpu)
+static void client_buffer_finalize(struct lib_ring_buffer *buf,
+                                  void *priv, int cpu,
+                                  struct shm_handle *handle)
 {
 }
 
@@ -142,46 +149,54 @@ static const struct lib_ring_buffer_config client_config = {
        .sync = RING_BUFFER_SYNC_GLOBAL,
        .mode = RING_BUFFER_MODE_TEMPLATE,
        .backend = RING_BUFFER_PAGE,
-       .output = RING_BUFFER_SPLICE,
+       .output = RING_BUFFER_MMAP,
        .oops = RING_BUFFER_OOPS_CONSISTENCY,
-       .ipi = RING_BUFFER_IPI_BARRIER,
-       .wakeup = RING_BUFFER_WAKEUP_BY_TIMER,
+       .ipi = RING_BUFFER_NO_IPI_BARRIER,
+       .wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
 };
 
 static
-struct channel *_channel_create(const char *name,
+struct ltt_channel *_channel_create(const char *name,
                                struct ltt_channel *ltt_chan, void *buf_addr,
                                size_t subbuf_size, size_t num_subbuf,
                                unsigned int switch_timer_interval,
-                               unsigned int read_timer_interval,
-                               int *shmid)
+                               unsigned int read_timer_interval)
 {
-       return channel_create(&client_config, name, ltt_chan, buf_addr,
+       ltt_chan->handle = channel_create(&client_config, name, ltt_chan, buf_addr,
                              subbuf_size, num_subbuf, switch_timer_interval,
-                             read_timer_interval, shmid);
+                             read_timer_interval);
+       if (!ltt_chan->handle)
+               return NULL;
+       ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan);
+       return ltt_chan;
 }
 
 static
-void ltt_channel_destroy(struct channel *chan)
+void ltt_channel_destroy(struct ltt_channel *ltt_chan)
 {
-       channel_destroy(chan);
+       channel_destroy(ltt_chan->chan, ltt_chan->handle);
 }
 
 static
-struct lib_ring_buffer *ltt_buffer_read_open(struct channel *chan)
+struct lib_ring_buffer *ltt_buffer_read_open(struct channel *chan,
+                                            struct shm_handle *handle,
+                                            int *shm_fd, int *wait_fd,
+                                            uint64_t *memory_map_size)
 {
        struct lib_ring_buffer *buf;
 
-       buf = channel_get_ring_buffer(&client_config, chan, 0);
-       if (!lib_ring_buffer_open_read(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))
                return buf;
        return NULL;
 }
 
 static
-void ltt_buffer_read_close(struct lib_ring_buffer *buf)
+void ltt_buffer_read_close(struct lib_ring_buffer *buf,
+                          struct shm_handle *handle)
 {
-       lib_ring_buffer_release_read(buf);
+       lib_ring_buffer_release_read(buf, handle);
 }
 
 static
@@ -204,13 +219,13 @@ void ltt_event_write(struct lib_ring_buffer_ctx *ctx, const void *src,
 }
 
 static
-size_t ltt_packet_avail_size(struct channel *chan)
+size_t ltt_packet_avail_size(struct channel *chan, struct shm_handle *handle)
                             
 {
        unsigned long o_begin;
        struct lib_ring_buffer *buf;
 
-       buf = shmp(chan->backend.buf);  /* Only for global buffer ! */
+       buf = shmp(handle, 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);
@@ -247,7 +262,7 @@ int ltt_is_disabled(struct channel *chan)
 }
 
 static struct ltt_transport ltt_relay_transport = {
-       .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING,
+       .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
        .ops = {
                .channel_create = _channel_create,
                .channel_destroy = ltt_channel_destroy,
@@ -264,16 +279,14 @@ static struct ltt_transport ltt_relay_transport = {
        },
 };
 
-static
-void __attribute__((constructor)) ltt_ring_buffer_client_init(void)
+void RING_BUFFER_MODE_TEMPLATE_INIT(void)
 {
-       printf("LTT : ltt ring buffer client init\n");
+       DBG("LTT : ltt ring buffer client init\n");
        ltt_transport_register(&ltt_relay_transport);
 }
 
-static
-void __attribute__((destructor)) ltt_ring_buffer_client_exit(void)
+void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
 {
-       printf("LTT : ltt ring buffer client exit\n");
+       DBG("LTT : ltt ring buffer client exit\n");
        ltt_transport_unregister(&ltt_relay_transport);
 }