1 files changed, 82 insertions, 0 deletions
diff --git a/watch.c b/watch.c
new file mode 100644
index 00000000..645cbd9a
--- /dev/null
+++ b/watch.c
@@ -0,0 +1,82 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "event2/watch.h"
+#include "event-internal.h"
+#include "evthread-internal.h"
+
+static inline struct evwatch *
+evwatch_new(struct event_base *base, union evwatch_cb callback, void *arg, unsigned type)
+{
+	struct evwatch *watcher = mm_malloc(sizeof(struct evwatch));
+	if (!watcher)
+		return NULL;
+	watcher->base = base;
+	watcher->type = type;
+	watcher->callback = callback;
+	watcher->arg = arg;
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	TAILQ_INSERT_TAIL(&base->watchers[type], watcher, next);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return watcher;
+}
+
+struct evwatch *
+evwatch_prepare_new(struct event_base *base, evwatch_prepare_cb callback, void *arg)
+{
+	union evwatch_cb cb = { .prepare = callback };
+	return evwatch_new(base, cb, arg, EVWATCH_PREPARE);
+}
+
+struct evwatch *
+evwatch_check_new(struct event_base *base, evwatch_check_cb callback, void *arg)
+{
+	union evwatch_cb cb = { .check = callback };
+	return evwatch_new(base, cb, arg, EVWATCH_CHECK);
+}
+
+struct event_base *
+evwatch_base(struct evwatch *watcher)
+{
+	return watcher->base;
+}
+
+void
+evwatch_free(struct evwatch *watcher)
+{
+	EVBASE_ACQUIRE_LOCK(watcher->base, th_base_lock);
+	TAILQ_REMOVE(&watcher->base->watchers[watcher->type], watcher, next);
+	EVBASE_RELEASE_LOCK(watcher->base, th_base_lock);
+	mm_free(watcher);
+}
+
+int
+evwatch_prepare_get_timeout(const struct evwatch_prepare_cb_info *info, struct timeval *timeout)
+{
+	if (info->timeout) {
+		*timeout = *(info->timeout);
+		return 1;
+	}
+	return 0;
+}