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authorLennart Poettering <lennart@poettering.net>2013-03-21 02:42:28 +0100
committerLennart Poettering <lennart@poettering.net>2013-03-21 02:54:47 +0100
commit30bdd695250eeecbf0b36c1e3c90d67ca03953ed (patch)
tree22d0a74a19b6b0354242cc31334684709affa574 /src/shared/prioq.h
parentbus: compare to negative errno (diff)
downloadsystemd-30bdd695250eeecbf0b36c1e3c90d67ca03953ed.tar.xz
systemd-30bdd695250eeecbf0b36c1e3c90d67ca03953ed.zip
shared: add simple priority queue implementation
Diffstat (limited to 'src/shared/prioq.h')
-rw-r--r--src/shared/prioq.h39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/shared/prioq.h b/src/shared/prioq.h
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "hashmap.h"
+
+typedef struct Prioq Prioq;
+
+Prioq *prioq_new(compare_func_t compare);
+void prioq_free(Prioq *q);
+
+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(Prioq *q);
+void *prioq_pop(Prioq *q);
+
+unsigned prioq_size(Prioq *q);
+bool prioq_isempty(Prioq *q);