1 files changed, 111 insertions, 0 deletions
diff --git a/include/runloop.h b/include/runloop.h
new file mode 100644
index 0000000..ea840e7
--- /dev/null
+++ b/include/runloop.h
@@ -0,0 +1,111 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file runloop.h
+ * Event loop
+ * A more elaborate file description.
+ */
+
+#ifndef URTC_RUNLOOP_H
+#define URTC_RUNLOOP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <poll.h>
+#include <pthread.h>
+#include <stdbool.h>
+
+typedef void *(*callback_t)(int fd, void *arg);
+
+typedef struct {
+	// File descriptor sets for poll().
+	struct pollfd *fds;
+	nfds_t nfds;
+
+	// Callback array. Index into array is file descriptor.
+	callback_t *callbacks;
+	void **args;
+
+	// Pipe for aborting blocked poll(). Allows dynamic adds/removes.
+	int abortpipe[2];
+	bool done;
+
+	// Run loop thread ID
+	pthread_t tid;
+} runloop_t;
+
+/**
+ * Create a new run loop
+ *
+ * Each run loop creates a separate thread which then repeatedly poll()s
+ * for events. Upon receiving an event, the run loop calls the respective
+ * file descriptor's callback function.
+ *
+ * @param[out] rl  Pointer to run loop struct
+ */
+int urtc__runloop_create(runloop_t *rl);
+
+/**
+ * Add file descriptor to run loop
+ *
+ * @param rl      Run loop
+ * @param fd      File descriptor
+ * @param events  Events to monitor (see struct pollfd)
+ * @param cb      Callback to run on activity
+ * @param arg     User-specified argument to pass to callback
+ *
+ * @return Zero on success. Negative on error.
+ */
+int urtc__runloop_add(
+	runloop_t *rl,
+	int fd,
+	short events,
+	void *(*cb)(int fd, void *arg),
+	void *arg
+);
+
+/**
+ * Remove a file descriptor from the run loop. No more events will be
+ * processed for this file descriptor.
+ *
+ * @param rl Run loop.
+ * @param fd File descriptor.
+ *
+ * @return Zero on success. Negative on error.
+ */
+int urtc__runloop_remove(runloop_t *rl, int fd);
+
+int urtc__runloop_join(runloop_t *rl);
+
+/**
+ * Destroy a run loop
+ *
+ * @param rl Pointer to run loop object
+ *
+ * @return Zero on success; negative on error. On error, errno is set.
+ */
+int urtc__runloop_destroy(runloop_t *rl);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_RUNLOOP_H */