1 files changed, 32 insertions, 0 deletions
diff --git a/src/basic/prioq.h b/src/basic/prioq.h
new file mode 100644
index 0000000..951576c
--- /dev/null
+++ b/src/basic/prioq.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdbool.h>
+
+#include "hashmap.h"
+#include "macro.h"
+
+typedef struct Prioq Prioq;
+
+#define PRIOQ_IDX_NULL ((unsigned) -1)
+
+Prioq *prioq_new(compare_func_t compare);
+Prioq *prioq_free(Prioq *q);
+DEFINE_TRIVIAL_CLEANUP_FUNC(Prioq*, prioq_free);
+int prioq_ensure_allocated(Prioq **q, compare_func_t compare_func);
+
+int prioq_put(Prioq *q, void *data, unsigned *idx);
+int prioq_remove(Prioq *q, void *data, unsigned *idx);
+int prioq_reshuffle(Prioq *q, void *data, unsigned *idx);
+
+void *prioq_peek_by_index(Prioq *q, unsigned idx) _pure_;
+static inline void *prioq_peek(Prioq *q) {
+        return prioq_peek_by_index(q, 0);
+}
+void *prioq_pop(Prioq *q);
+
+#define PRIOQ_FOREACH_ITEM(q, p)                                \
+        for (unsigned _i = 0; (p = prioq_peek_by_index(q, _i)); _i++)
+
+unsigned prioq_size(Prioq *q) _pure_;
+bool prioq_isempty(Prioq *q) _pure_;