aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--src/util/hash_table.c26
-rw-r--r--src/util/hash_table.h2
-rw-r--r--src/util/tests/hash_table/Makefile.am1
-rw-r--r--src/util/tests/hash_table/clear.c91
4 files changed, 120 insertions, 0 deletions
diff --git a/src/util/hash_table.c b/src/util/hash_table.c
index 3ec65afd4bb..4cfe3d93251 100644
--- a/src/util/hash_table.c
+++ b/src/util/hash_table.c
@@ -163,6 +163,32 @@ _mesa_hash_table_destroy(struct hash_table *ht,
ralloc_free(ht);
}
+/**
+ * Deletes all entries of the given hash table without deleting the table
+ * itself or changing its structure.
+ *
+ * If delete_function is passed, it gets called on each entry present.
+ */
+void
+_mesa_hash_table_clear(struct hash_table *ht,
+ void (*delete_function)(struct hash_entry *entry))
+{
+ struct hash_entry *entry;
+
+ for (entry = ht->table; entry != ht->table + ht->size; entry++) {
+ if (entry->key == NULL)
+ continue;
+
+ if (delete_function != NULL && entry->key != ht->deleted_key)
+ delete_function(entry);
+
+ entry->key = NULL;
+ }
+
+ ht->entries = 0;
+ ht->deleted_entries = 0;
+}
+
/** Sets the value of the key pointer used for deleted entries in the table.
*
* The assumption is that usually keys are actual pointers, so we use a
diff --git a/src/util/hash_table.h b/src/util/hash_table.h
index eb9dbc333ec..611dcf810dc 100644
--- a/src/util/hash_table.h
+++ b/src/util/hash_table.h
@@ -64,6 +64,8 @@ _mesa_hash_table_create(void *mem_ctx,
const void *b));
void _mesa_hash_table_destroy(struct hash_table *ht,
void (*delete_function)(struct hash_entry *entry));
+void _mesa_hash_table_clear(struct hash_table *ht,
+ void (*delete_function)(struct hash_entry *entry));
void _mesa_hash_table_set_deleted_key(struct hash_table *ht,
const void *deleted_key);
diff --git a/src/util/tests/hash_table/Makefile.am b/src/util/tests/hash_table/Makefile.am
index 04a77e30df1..8f12240cede 100644
--- a/src/util/tests/hash_table/Makefile.am
+++ b/src/util/tests/hash_table/Makefile.am
@@ -29,6 +29,7 @@ LDADD = \
$(DLOPEN_LIBS)
TESTS = \
+ clear \
collision \
delete_and_lookup \
delete_management \
diff --git a/src/util/tests/hash_table/clear.c b/src/util/tests/hash_table/clear.c
new file mode 100644
index 00000000000..526700bfb0f
--- /dev/null
+++ b/src/util/tests/hash_table/clear.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ *
+ * 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, sublicense,
+ * 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
+ * THE AUTHOR(S) AND/OR THEIR 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.
+ */
+
+#include "hash_table.h"
+
+static void *make_key(uint32_t i)
+{
+ return (void *)(uintptr_t)(1 + i);
+}
+
+static uint32_t key_id(const void *key)
+{
+ return (uintptr_t)key - 1;
+}
+
+static uint32_t key_hash(const void *key)
+{
+ return (uintptr_t)key;
+}
+
+static bool key_equal(const void *a, const void *b)
+{
+ return a == b;
+}
+
+static void delete_function(struct hash_entry *entry)
+{
+ bool *deleted = (bool *)entry->data;
+ assert(!*deleted);
+ *deleted = true;
+}
+
+int main()
+{
+ struct hash_table *ht;
+ struct hash_entry *entry;
+ const uint32_t size = 1000;
+ bool flags[size];
+ uint32_t i;
+
+ ht = _mesa_hash_table_create(NULL, key_hash, key_equal);
+
+ for (i = 0; i < size; ++i) {
+ flags[i] = false;
+ _mesa_hash_table_insert(ht, make_key(i), &flags[i]);
+ }
+
+ _mesa_hash_table_clear(ht, delete_function);
+ assert(_mesa_hash_table_next_entry(ht, NULL) == NULL);
+
+ /* Check that delete_function was called and that repopulating the table
+ * works. */
+ for (i = 0; i < size; ++i) {
+ assert(flags[i]);
+ flags[i] = false;
+ _mesa_hash_table_insert(ht, make_key(i), &flags[i]);
+ }
+
+ /* Check that exactly the right set of entries is in the table. */
+ for (i = 0; i < size; ++i) {
+ assert(_mesa_hash_table_search(ht, make_key(i)));
+ }
+
+ hash_table_foreach(ht, entry) {
+ assert(key_id(entry->key) < size);
+ }
+
+ _mesa_hash_table_destroy(ht, NULL);
+
+ return 0;
+}