shm: introduce shmp_index

[lttng-ust.git] / libringbuffer / ring_buffer_backend.c

diff --git a/libringbuffer/ring_buffer_backend.c b/libringbuffer/ring_buffer_backend.c
index 18dd1b01073027efc9219bf01d905b1f3049c5a3..816c99cb2b3a2b4c9af29886c4e0322744aec936 100644 (file)
--- a/libringbuffer/ring_buffer_backend.c
+++ b/libringbuffer/ring_buffer_backend.c
@@ -65,7 +65,7 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config
                set_shmp(shmp(handle, bufb->array)[i].shmp,
                        zalloc_shm(shmobj,
                                sizeof(struct lib_ring_buffer_backend_pages)));
-               if (!shmp(handle, shmp(handle, bufb->array)[i].shmp))
+               if (!shmp(handle, shmp_index(handle, bufb->array, i)->shmp))
                        goto free_array;
        }
 
@@ -78,7 +78,7 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config
                goto free_array;
 
        for (i = 0; i < num_subbuf; i++)
-               shmp(handle, bufb->buf_wsb)[i].id = subbuffer_id(config, 0, 1, i);
+               shmp_index(handle, bufb->buf_wsb, i)->id = subbuffer_id(config, 0, 1, i);
 
        /* Assign read-side subbuffer table */
        if (extra_reader_sb)
@@ -95,10 +95,10 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config
                ref.offset = bufb->memory_map._ref.offset;
                ref.offset += i * subbuf_size;
 
-               set_shmp(shmp(handle, shmp(handle, bufb->array)[i].shmp)->p,
+               set_shmp(shmp(handle, shmp_index(handle, bufb->array, i)->shmp)->p,
                         ref);
                if (config->output == RING_BUFFER_MMAP) {
-                       shmp(handle, shmp(handle, bufb->array)[i].shmp)->mmap_offset = mmap_offset;
+                       shmp(handle, shmp_index(handle, bufb->array, i)->shmp)->mmap_offset = mmap_offset;
                        mmap_offset += subbuf_size;
                }
        }
@@ -150,7 +150,7 @@ void lib_ring_buffer_backend_reset(struct lib_ring_buffer_backend *bufb,
                num_subbuf_alloc++;
 
        for (i = 0; i < chanb->num_subbuf; i++)
-               shmp(handle, bufb->buf_wsb)[i].id = subbuffer_id(config, 0, 1, i);
+               shmp_index(handle, bufb->buf_wsb, i)->id = subbuffer_id(config, 0, 1, i);
        if (chanb->extra_reader_sb)
                bufb->buf_rsb.id = subbuffer_id(config, 0, 1,
                                                num_subbuf_alloc - 1);
@@ -159,9 +159,9 @@ void lib_ring_buffer_backend_reset(struct lib_ring_buffer_backend *bufb,
 
        for (i = 0; i < num_subbuf_alloc; i++) {
                /* Don't reset mmap_offset */
-               v_set(config, &shmp(handle, shmp(handle, bufb->array)[i].shmp)->records_commit, 0);
-               v_set(config, &shmp(handle, shmp(handle, bufb->array)[i].shmp)->records_unread, 0);
-               shmp(handle, shmp(handle, bufb->array)[i].shmp)->data_size = 0;
+               v_set(config, &shmp(handle, shmp_index(handle, bufb->array, i)->shmp)->records_commit, 0);
+               v_set(config, &shmp(handle, shmp_index(handle, bufb->array, i)->shmp)->records_unread, 0);
+               shmp(handle, shmp_index(handle, bufb->array, i)->shmp)->data_size = 0;
                /* Don't reset backend page and virt addresses */
        }
        /* Don't reset num_pages_per_subbuf, cpu, allocated */
@@ -378,7 +378,7 @@ size_t lib_ring_buffer_read(struct lib_ring_buffer_backend *bufb, size_t offset,
                return 0;
        id = bufb->buf_rsb.id;
        sb_bindex = subbuffer_id_get_index(config, id);
-       rpages = &shmp(handle, bufb->array)[sb_bindex];
+       rpages = shmp_index(handle, bufb->array, sb_bindex);
        /*
         * Underlying layer should never ask for reads across
         * subbuffers.
@@ -386,7 +386,7 @@ size_t lib_ring_buffer_read(struct lib_ring_buffer_backend *bufb, size_t offset,
        CHAN_WARN_ON(chanb, offset >= chanb->buf_size);
        CHAN_WARN_ON(chanb, config->mode == RING_BUFFER_OVERWRITE
                     && subbuffer_id_is_noref(config, id));
-       memcpy(dest, shmp(handle, shmp(handle, rpages->shmp)->p) + (offset & ~(chanb->subbuf_size - 1)), len);
+       memcpy(dest, shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & ~(chanb->subbuf_size - 1)), len);
        return orig_len;
 }
 
@@ -414,7 +414,7 @@ int lib_ring_buffer_read_cstr(struct lib_ring_buffer_backend *bufb, size_t offse
        orig_offset = offset;
        id = bufb->buf_rsb.id;
        sb_bindex = subbuffer_id_get_index(config, id);
-       rpages = &shmp(handle, bufb->array)[sb_bindex];
+       rpages = shmp_index(handle, bufb->array, sb_bindex);
        /*
         * Underlying layer should never ask for reads across
         * subbuffers.
@@ -422,7 +422,7 @@ int lib_ring_buffer_read_cstr(struct lib_ring_buffer_backend *bufb, size_t offse
        CHAN_WARN_ON(chanb, offset >= chanb->buf_size);
        CHAN_WARN_ON(chanb, config->mode == RING_BUFFER_OVERWRITE
                     && subbuffer_id_is_noref(config, id));
-       str = (char *)shmp(handle, shmp(handle, rpages->shmp)->p) + (offset & ~(chanb->subbuf_size - 1));
+       str = shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & ~(chanb->subbuf_size - 1));
        string_len = strnlen(str, len);
        if (dest && len) {
                memcpy(dest, str, string_len);
@@ -453,10 +453,10 @@ void *lib_ring_buffer_read_offset_address(struct lib_ring_buffer_backend *bufb,
        offset &= chanb->buf_size - 1;
        id = bufb->buf_rsb.id;
        sb_bindex = subbuffer_id_get_index(config, id);
-       rpages = &shmp(handle, bufb->array)[sb_bindex];
+       rpages = shmp_index(handle, bufb->array, sb_bindex);
        CHAN_WARN_ON(chanb, config->mode == RING_BUFFER_OVERWRITE
                     && subbuffer_id_is_noref(config, id));
-       return shmp(handle, shmp(handle, rpages->shmp)->p) + (offset & ~(chanb->subbuf_size - 1));
+       return shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & ~(chanb->subbuf_size - 1));
 }
 
 /**
@@ -481,10 +481,10 @@ void *lib_ring_buffer_offset_address(struct lib_ring_buffer_backend *bufb,
 
        offset &= chanb->buf_size - 1;
        sbidx = offset >> chanb->subbuf_size_order;
-       id = shmp(handle, bufb->buf_wsb)[sbidx].id;
+       id = shmp_index(handle, bufb->buf_wsb, sbidx)->id;
        sb_bindex = subbuffer_id_get_index(config, id);
-       rpages = &shmp(handle, bufb->array)[sb_bindex];
+       rpages = shmp_index(handle, bufb->array, sb_bindex);
        CHAN_WARN_ON(chanb, config->mode == RING_BUFFER_OVERWRITE
                     && subbuffer_id_is_noref(config, id));
-       return shmp(handle, shmp(handle, rpages->shmp)->p) + (offset & ~(chanb->subbuf_size - 1));
+       return shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & ~(chanb->subbuf_size - 1));
 }