--- /dev/null
+/**************************************************************************
+ *
+ * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * \file
+ * Buffer cache.
+ *
+ * \author José Fonseca <jrfonseca-at-tungstengraphics-dot-com>
+ * \author Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_debug.h"
+#include "pipe/p_winsys.h"
+#include "pipe/p_thread.h"
+#include "pipe/p_util.h"
+#include "util/u_double_list.h"
+#include "util/u_time.h"
+
+#include "pb_buffer.h"
+#include "pb_bufmgr.h"
+
+
+/**
+ * Convenience macro (type safe).
+ */
+#define SUPER(__derived) (&(__derived)->base)
+
+
+struct pb_cache_manager;
+
+
+/**
+ * Wrapper around a pipe buffer which adds delayed destruction.
+ */
+struct pb_cache_buffer
+{
+ struct pb_buffer base;
+
+ struct pb_buffer *buffer;
+ struct pb_cache_manager *mgr;
+
+ /** Caching time interval */
+ struct util_time start, end;
+
+ struct list_head head;
+};
+
+
+struct pb_cache_manager
+{
+ struct pb_manager base;
+
+ struct pb_manager *provider;
+ unsigned usecs;
+
+ _glthread_Mutex mutex;
+
+ struct list_head delayed;
+ size_t numDelayed;
+};
+
+
+static INLINE struct pb_cache_buffer *
+pb_cache_buffer(struct pb_buffer *buf)
+{
+ assert(buf);
+ return (struct pb_cache_buffer *)buf;
+}
+
+
+static INLINE struct pb_cache_manager *
+pb_cache_manager(struct pb_manager *mgr)
+{
+ assert(mgr);
+ return (struct pb_cache_manager *)mgr;
+}
+
+
+/**
+ * Actually destroy the buffer.
+ */
+static INLINE void
+_pb_cache_buffer_destroy(struct pb_cache_buffer *buf)
+{
+ struct pb_cache_manager *mgr = buf->mgr;
+
+ LIST_DEL(&buf->head);
+ assert(mgr->numDelayed);
+ --mgr->numDelayed;
+ assert(!buf->base.base.refcount);
+ pb_reference(&buf->buffer, NULL);
+ FREE(buf);
+}
+
+
+/**
+ * Free as many cache buffers from the list head as possible.
+ */
+static void
+_pb_cache_buffer_list_check_free(struct pb_cache_manager *mgr)
+{
+ struct list_head *curr, *next;
+ struct pb_cache_buffer *buf;
+ struct util_time now;
+
+ util_time_get(&now);
+
+ curr = mgr->delayed.next;
+ next = curr->next;
+ while(curr != &mgr->delayed) {
+ buf = LIST_ENTRY(struct pb_cache_buffer, curr, head);
+
+ if(util_time_timeout(&buf->start, &buf->end, &now) != 0)
+ break;
+
+ _pb_cache_buffer_destroy(buf);
+
+ curr = next;
+ next = curr->next;
+ }
+}
+
+
+static void
+pb_cache_buffer_destroy(struct pb_buffer *_buf)
+{
+ struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
+ struct pb_cache_manager *mgr = buf->mgr;
+
+ _glthread_LOCK_MUTEX(mgr->mutex);
+ assert(buf->base.base.refcount == 0);
+
+ _pb_cache_buffer_list_check_free(mgr);
+
+ util_time_get(&buf->start);
+ util_time_add(&buf->start, mgr->usecs, &buf->end);
+ LIST_ADDTAIL(&buf->head, &mgr->delayed);
+ ++mgr->numDelayed;
+ _glthread_UNLOCK_MUTEX(mgr->mutex);
+}
+
+
+static void *
+pb_cache_buffer_map(struct pb_buffer *_buf,
+ unsigned flags)
+{
+ struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
+ return pb_map(buf->buffer, flags);
+}
+
+
+static void
+pb_cache_buffer_unmap(struct pb_buffer *_buf)
+{
+ struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
+ pb_unmap(buf->buffer);
+}
+
+
+static void
+pb_cache_buffer_get_base_buffer(struct pb_buffer *_buf,
+ struct pb_buffer **base_buf,
+ unsigned *offset)
+{
+ struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
+ pb_get_base_buffer(buf->buffer, base_buf, offset);
+}
+
+
+const struct pb_vtbl
+pb_cache_buffer_vtbl = {
+ pb_cache_buffer_destroy,
+ pb_cache_buffer_map,
+ pb_cache_buffer_unmap,
+ pb_cache_buffer_get_base_buffer
+};
+
+
+static struct pb_buffer *
+pb_cache_manager_create_buffer(struct pb_manager *_mgr,
+ size_t size,
+ const struct pb_desc *desc)
+{
+ struct pb_cache_manager *mgr = pb_cache_manager(_mgr);
+ struct pb_cache_buffer *buf;
+ struct list_head *curr, *next;
+ struct util_time now;
+
+ util_time_get(&now);
+ curr = mgr->delayed.next;
+ next = curr->next;
+ while(curr != &mgr->delayed) {
+ buf = LIST_ENTRY(struct pb_cache_buffer, curr, head);
+
+ if(buf->base.base.size == size &&
+ buf->base.base.alignment >= desc->alignment &&
+ (buf->base.base.alignment % desc->alignment) == 0 &&
+ /* buf->base.base.usage == usage */ 1) {
+ ++buf->base.base.refcount;
+ return &buf->base;
+ }
+
+ if(util_time_timeout(&buf->start, &buf->end, &now) != 0)
+ _pb_cache_buffer_destroy(buf);
+
+ curr = next;
+ next = curr->next;
+ }
+
+ buf = CALLOC_STRUCT(pb_cache_buffer);
+ if(!buf)
+ return NULL;
+
+ buf->buffer = mgr->provider->create_buffer(mgr->provider, size, desc);
+ if(!buf->buffer) {
+ FREE(buf);
+ return NULL;
+ }
+
+ buf->base.base.refcount = 1;
+ buf->base.base.alignment = buf->buffer->base.alignment;
+ buf->base.base.usage = buf->buffer->base.usage;
+ buf->base.base.size = buf->buffer->base.size;
+
+ buf->base.vtbl = &pb_cache_buffer_vtbl;
+ buf->mgr = mgr;
+
+ return &buf->base;
+}
+
+
+static void
+pb_cache_manager_destroy(struct pb_manager *_mgr)
+{
+ struct pb_cache_manager *mgr = pb_cache_manager(_mgr);
+ struct list_head *curr, *next;
+ struct pb_cache_buffer *buf;
+
+ _glthread_LOCK_MUTEX(mgr->mutex);
+ curr = mgr->delayed.next;
+ next = curr->next;
+ while(curr != &mgr->delayed) {
+ buf = LIST_ENTRY(struct pb_cache_buffer, curr, head);
+ _pb_cache_buffer_destroy(buf);
+ curr = next;
+ next = curr->next;
+ }
+ _glthread_UNLOCK_MUTEX(mgr->mutex);
+
+ FREE(mgr);
+}
+
+
+struct pb_manager *
+pb_cache_manager_create(struct pb_manager *provider,
+ unsigned usecs)
+{
+ struct pb_cache_manager *mgr;
+
+ mgr = (struct pb_cache_manager *)CALLOC(1, sizeof(*mgr));
+ if (!mgr)
+ return NULL;
+
+ mgr->base.destroy = pb_cache_manager_destroy;
+ mgr->base.create_buffer = pb_cache_manager_create_buffer;
+ mgr->provider = provider;
+ mgr->usecs = usecs;
+ LIST_INITHEAD(&mgr->delayed);
+ mgr->numDelayed = 0;
+ _glthread_INIT_MUTEX(mgr->mutex);
+
+ return &mgr->base;
+}
projects / mesa.git / commitdiff