kern/condition: new module

1 files changed, 46 insertions, 0 deletions

diff --git a/kern/condition.h b/kern/condition.h
new file mode 100644
index 00000000..1b0242e7
--- /dev/null
+++ b/kern/condition.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2013 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Condition variables.
+ */
+
+#ifndef _KERN_CONDITION_H
+#define _KERN_CONDITION_H
+
+#include <kern/list.h>
+#include <kern/mutex.h>
+#include <kern/spinlock.h>
+#include <kern/stddef.h>
+
+struct condition {
+    struct spinlock lock;
+    struct mutex *mutex;
+    struct list waiters;
+};
+
+#define CONDITION_INITIALIZER(condition) \
+    { SPINLOCK_INITIALIZER, NULL, LIST_INITIALIZER((condition).waiters) }
+
+void condition_init(struct condition *cond);
+
+void condition_wait(struct condition *cond, struct mutex *mutex);
+
+void condition_signal(struct condition *cond);
+
+void condition_broadcast(struct condition *cond);
+
+#endif /* _KERN_CONDITION_H */