ust-fd: Add close_range declaration

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

diff --git a/libringbuffer/backend.h b/libringbuffer/backend.h
deleted file mode 100644 (file)
index d4824d6..0000000
--- a/libringbuffer/backend.h
+++ /dev/null
@@ -1,125 +0,0 @@
-#ifndef _LINUX_RING_BUFFER_BACKEND_H
-#define _LINUX_RING_BUFFER_BACKEND_H
-
-/*
- * linux/ringbuffer/backend.h
- *
- * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Ring buffer backend (API).
- *
- * Dual LGPL v2.1/GPL v2 license.
- *
- * Credits to Steven Rostedt for proposing to use an extra-subbuffer owned by
- * the reader in flight recorder mode.
- */
-
-#include <unistd.h>
-
-/* Internal helpers */
-#include "backend_internal.h"
-#include "frontend_internal.h"
-
-/* Ring buffer backend API */
-
-/* Ring buffer backend access (read/write) */
-
-extern size_t lib_ring_buffer_read(struct lttng_ust_lib_ring_buffer_backend *bufb,
-                                  size_t offset, void *dest, size_t len,
-                                  struct lttng_ust_shm_handle *handle);
-
-extern int lib_ring_buffer_read_cstr(struct lttng_ust_lib_ring_buffer_backend *bufb,
-                                    size_t offset, void *dest, size_t len,
-                                    struct lttng_ust_shm_handle *handle);
-
-/*
- * Return the address where a given offset is located.
- * Should be used to get the current subbuffer header pointer. Given we know
- * it's never on a page boundary, it's safe to write directly to this address,
- * as long as the write is never bigger than a page size.
- */
-extern void *
-lib_ring_buffer_offset_address(struct lttng_ust_lib_ring_buffer_backend *bufb,
-                              size_t offset,
-                              struct lttng_ust_shm_handle *handle);
-extern void *
-lib_ring_buffer_read_offset_address(struct lttng_ust_lib_ring_buffer_backend *bufb,
-                                   size_t offset,
-                                   struct lttng_ust_shm_handle *handle);
-
-/**
- * lib_ring_buffer_write - write data to a buffer backend
- * @config : ring buffer instance configuration
- * @ctx: ring buffer context. (input arguments only)
- * @src : source pointer to copy from
- * @len : length of data to copy
- *
- * This function copies "len" bytes of data from a source pointer to a buffer
- * backend, at the current context offset. This is more or less a buffer
- * backend-specific memcpy() operation. Calls the slow path (_ring_buffer_write)
- * if copy is crossing a page boundary.
- */
-static inline
-void lib_ring_buffer_write(const struct lttng_ust_lib_ring_buffer_config *config,
-                          struct lttng_ust_lib_ring_buffer_ctx *ctx,
-                          const void *src, size_t len)
-{
-       struct lttng_ust_lib_ring_buffer_backend *bufb = &ctx->buf->backend;
-       struct channel_backend *chanb = &ctx->chan->backend;
-       struct lttng_ust_shm_handle *handle = ctx->handle;
-       size_t sbidx;
-       size_t offset = ctx->buf_offset;
-       struct lttng_ust_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_index(handle, bufb->buf_wsb, sbidx)->id;
-       sb_bindex = subbuffer_id_get_index(config, id);
-       rpages = shmp_index(handle, bufb->array, sb_bindex);
-       CHAN_WARN_ON(ctx->chan,
-                    config->mode == RING_BUFFER_OVERWRITE
-                    && subbuffer_id_is_noref(config, id));
-       /*
-        * Underlying layer should never ask for writes across
-        * subbuffers.
-        */
-       CHAN_WARN_ON(chanb, offset >= chanb->buf_size);
-       lib_ring_buffer_do_copy(config,
-                               shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & (chanb->subbuf_size - 1)),
-                               src, len);
-       ctx->buf_offset += len;
-}
-
-/*
- * This accessor counts the number of unread records in a buffer.
- * It only provides a consistent value if no reads not writes are performed
- * concurrently.
- */
-static inline
-unsigned long lib_ring_buffer_get_records_unread(
-                               const struct lttng_ust_lib_ring_buffer_config *config,
-                               struct lttng_ust_lib_ring_buffer *buf,
-                               struct lttng_ust_shm_handle *handle)
-{
-       struct lttng_ust_lib_ring_buffer_backend *bufb = &buf->backend;
-       struct lttng_ust_lib_ring_buffer_backend_pages_shmp *pages;
-       unsigned long records_unread = 0, sb_bindex, id;
-       unsigned int i;
-
-       for (i = 0; i < shmp(handle, bufb->chan)->backend.num_subbuf; i++) {
-               id = shmp_index(handle, bufb->buf_wsb, i)->id;
-               sb_bindex = subbuffer_id_get_index(config, id);
-               pages = shmp_index(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_index(handle, bufb->array, sb_bindex);
-               records_unread += v_read(config, &shmp(handle, pages->shmp)->records_unread);
-       }
-       return records_unread;
-}
-
-#endif /* _LINUX_RING_BUFFER_BACKEND_H */