#include <stdint.h>
#include <glib.h>
#include <string.h>
+#include <sys/mman.h>
#include "bluesky-private.h"
BlueSkyRCStr *bluesky_string_new(gpointer data, gsize len)
{
BlueSkyRCStr *string = g_new(BlueSkyRCStr, 1);
+ string->mmap = NULL;
string->data = data;
string->len = len;
g_atomic_int_set(&string->refcount, 1);
return bluesky_string_new(g_string_free(s, FALSE), len);
}
+/* Create a new BlueSkyRCStr from a memory-mapped buffer. */
+BlueSkyRCStr *bluesky_string_new_from_mmap(BlueSkyCacheFile *mmap,
+ int offset, gsize len)
+{
+ g_assert(offset + len <= mmap->len);
+
+ BlueSkyRCStr *string = g_new(BlueSkyRCStr, 1);
+ string->mmap = mmap;
+ g_atomic_int_inc(&mmap->mapcount);
+ string->data = (char *)mmap->addr + offset;
+ string->len = len;
+ g_atomic_int_set(&string->refcount, 1);
+ return string;
+}
+
void bluesky_string_ref(BlueSkyRCStr *string)
{
if (string == NULL)
return;
if (g_atomic_int_dec_and_test(&string->refcount)) {
- g_free(string->data);
+ if (string->mmap == NULL) {
+ g_free(string->data);
+ } else {
+ bluesky_mmap_unref(string->mmap);
+ }
g_free(string);
}
}
if (string == NULL)
return NULL;
+ if (string->mmap != NULL) {
+ BlueSkyRCStr *s;
+ s = bluesky_string_new(g_memdup(string->data, string->len),
+ string->len);
+ bluesky_string_unref(string);
+ return s;
+ }
+
if (g_atomic_int_dec_and_test(&string->refcount)) {
/* There are no other shared copies, so return this one. */
g_atomic_int_inc(&string->refcount);
* if needed). */
void bluesky_string_resize(BlueSkyRCStr *string, gsize len)
{
+ g_assert(string->mmap == NULL);
+
if (string->len == len)
return;
else
return (BlueSkyInode *)head->prev->data;
}
+
+/**** Range sets. ****/
+
+/* These are a data structure which can track a set of discontiguous integer
+ * ranges--such as the partitioning of the inode number space or the bytes in a
+ * log file into objects. This current prototype implementation just tracks
+ * the starting offset with a hash table and doesn't track the length, but
+ * should be extended later to track properly. */
+
+struct BlueSkyRangeset {
+ GHashTable *hashtable;
+};
+
+BlueSkyRangeset *bluesky_rangeset_new()
+{
+ BlueSkyRangeset *rangeset = g_new(BlueSkyRangeset, 1);
+ rangeset->hashtable = g_hash_table_new(g_direct_hash, g_direct_equal);
+ return rangeset;
+}
+
+void bluesky_rangeset_free(BlueSkyRangeset *rangeset)
+{
+ g_hash_table_unref(rangeset->hashtable);
+ g_free(rangeset);
+}
+
+gboolean bluesky_rangeset_insert(BlueSkyRangeset *rangeset,
+ int start, int length, gpointer data)
+{
+ g_hash_table_insert(rangeset->hashtable, GINT_TO_POINTER(start), data);
+ return TRUE;
+}
+
+gpointer bluesky_rangeset_lookup(BlueSkyRangeset *rangeset, int start)
+{
+ return g_hash_table_lookup(rangeset->hashtable, GINT_TO_POINTER(start));
+}