Implement shm object table

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

diff --git a/libringbuffer/backend.h b/libringbuffer/backend.h
index 1bd61109ca0096e2685b864324449b5760dc3128..e26045af2c7318f8bff93813cd9beaae8085db81 100644 (file)
--- a/libringbuffer/backend.h
+++ b/libringbuffer/backend.h
@@ -27,10 +27,12 @@
 /* Ring buffer backend access (read/write) */
 
 extern size_t lib_ring_buffer_read(struct lib_ring_buffer_backend *bufb,
-                                  size_t offset, void *dest, size_t len);
+                                  size_t offset, void *dest, size_t len,
+                                  struct shm_handle *handle);
 
 extern int lib_ring_buffer_read_cstr(struct lib_ring_buffer_backend *bufb,
-                                    size_t offset, void *dest, size_t len);
+                                    size_t offset, void *dest, size_t len,
+                                    struct shm_handle *handle);
 
 /*
  * Return the address where a given offset is located.
@@ -40,10 +42,12 @@ extern int lib_ring_buffer_read_cstr(struct lib_ring_buffer_backend *bufb,
  */
 extern void *
 lib_ring_buffer_offset_address(struct lib_ring_buffer_backend *bufb,
-                              size_t offset);
+                              size_t offset,
+                              struct shm_handle *handle);
 extern void *
 lib_ring_buffer_read_offset_address(struct lib_ring_buffer_backend *bufb,
-                                   size_t offset);
+                                   size_t offset,
+                                   struct shm_handle *handle);
 
 /**
  * lib_ring_buffer_write - write data to a buffer backend
@@ -64,16 +68,17 @@ void lib_ring_buffer_write(const struct lib_ring_buffer_config *config,
 {
        struct lib_ring_buffer_backend *bufb = &ctx->buf->backend;
        struct channel_backend *chanb = &ctx->chan->backend;
+       struct shm_handle *handle = ctx->handle;
        size_t sbidx;
        size_t offset = ctx->buf_offset;
-       struct lib_ring_buffer_backend_pages *rpages;
+       struct lib_ring_buffer_backend_pages_shmp *rpages;
        unsigned long sb_bindex, id;
 
        offset &= chanb->buf_size - 1;
        sbidx = offset >> chanb->subbuf_size_order;
-       id = shmp(bufb->buf_wsb)[sbidx].id;
+       id = shmp(handle, bufb->buf_wsb)[sbidx].id;
        sb_bindex = subbuffer_id_get_index(config, id);
-       rpages = shmp(bufb->array)[sb_bindex];
+       rpages = &shmp(handle, bufb->array)[sb_bindex];
        CHAN_WARN_ON(ctx->chan,
                     config->mode == RING_BUFFER_OVERWRITE
                     && subbuffer_id_is_noref(config, id));
@@ -83,7 +88,7 @@ void lib_ring_buffer_write(const struct lib_ring_buffer_config *config,
         */
        CHAN_WARN_ON(chanb, offset >= chanb->buf_size);
        lib_ring_buffer_do_copy(config,
-                               shmp(rpages->p) + (offset & ~(chanb->subbuf_size - 1)),
+                               shmp(handle, shmp(handle, rpages->shmp)->p) + (offset & ~(chanb->subbuf_size - 1)),
                                src, len);
        ctx->buf_offset += len;
 }
@@ -96,24 +101,25 @@ void lib_ring_buffer_write(const struct lib_ring_buffer_config *config,
 static inline
 unsigned long lib_ring_buffer_get_records_unread(
                                const struct lib_ring_buffer_config *config,
-                               struct lib_ring_buffer *buf)
+                               struct lib_ring_buffer *buf,
+                               struct shm_handle *handle)
 {
        struct lib_ring_buffer_backend *bufb = &buf->backend;
-       struct lib_ring_buffer_backend_pages *pages;
+       struct lib_ring_buffer_backend_pages_shmp *pages;
        unsigned long records_unread = 0, sb_bindex, id;
        unsigned int i;
 
-       for (i = 0; i < shmp(bufb->chan)->backend.num_subbuf; i++) {
-               id = shmp(bufb->buf_wsb)[i].id;
+       for (i = 0; i < shmp(handle, bufb->chan)->backend.num_subbuf; i++) {
+               id = shmp(handle, bufb->buf_wsb)[i].id;
                sb_bindex = subbuffer_id_get_index(config, id);
-               pages = shmp(bufb->array)[sb_bindex];
-               records_unread += v_read(config, &pages->records_unread);
+               pages = &shmp(handle, bufb->array)[sb_bindex];
+               records_unread += v_read(config, &shmp(handle, pages->shmp)->records_unread);
        }
        if (config->mode == RING_BUFFER_OVERWRITE) {
                id = bufb->buf_rsb.id;
                sb_bindex = subbuffer_id_get_index(config, id);
-               pages = shmp(bufb->array)[sb_bindex];
-               records_unread += v_read(config, &pages->records_unread);
+               pages = &shmp(handle, bufb->array)[sb_bindex];
+               records_unread += v_read(config, &shmp(handle, pages->shmp)->records_unread);
        }
        return records_unread;
 }