+/**
+ * Delete all entries in a hash table, but don't delete the table itself.
+ * Invoke the given callback function for each table entry.
+ *
+ * \param table the hash table to delete
+ * \param callback the callback function
+ * \param userData arbitrary pointer to pass along to the callback
+ * (this is typically a struct gl_context pointer)
+ */
+void
+_mesa_HashDeleteAll(struct _mesa_HashTable *table,
+ void (*callback)(GLuint key, void *data, void *userData),
+ void *userData)
+{
+ GLuint pos;
+ ASSERT(table);
+ ASSERT(callback);
+ _glthread_LOCK_MUTEX(table->Mutex);
+ table->InDeleteAll = GL_TRUE;
+ for (pos = 0; pos < TABLE_SIZE; pos++) {
+ struct HashEntry *entry, *next;
+ for (entry = table->Table[pos]; entry; entry = next) {
+ callback(entry->Key, entry->Data, userData);
+ next = entry->Next;
+ free(entry);
+ }
+ table->Table[pos] = NULL;
+ }
+ table->InDeleteAll = GL_FALSE;
+ _glthread_UNLOCK_MUTEX(table->Mutex);
+}
+
+
+/**
+ * Walk over all entries in a hash table, calling callback function for each.
+ * Note: we use a separate mutex in this function to avoid a recursive
+ * locking deadlock (in case the callback calls _mesa_HashRemove()) and to
+ * prevent multiple threads/contexts from getting tangled up.
+ * A lock-less version of this function could be used when the table will
+ * not be modified.
+ * \param table the hash table to walk
+ * \param callback the callback function
+ * \param userData arbitrary pointer to pass along to the callback
+ * (this is typically a struct gl_context pointer)
+ */
+void
+_mesa_HashWalk(const struct _mesa_HashTable *table,
+ void (*callback)(GLuint key, void *data, void *userData),
+ void *userData)
+{
+ /* cast-away const */
+ struct _mesa_HashTable *table2 = (struct _mesa_HashTable *) table;
+ GLuint pos;
+ ASSERT(table);
+ ASSERT(callback);
+ _glthread_LOCK_MUTEX(table2->WalkMutex);
+ for (pos = 0; pos < TABLE_SIZE; pos++) {
+ struct HashEntry *entry, *next;
+ for (entry = table->Table[pos]; entry; entry = next) {
+ /* save 'next' pointer now in case the callback deletes the entry */
+ next = entry->Next;
+ callback(entry->Key, entry->Data, userData);
+ }
+ }
+ _glthread_UNLOCK_MUTEX(table2->WalkMutex);
+}
+
+
+/**