add some more code

This adds a basic "worker" program.

You can now do something like

    ./server &
    ./worker &
    ./client ci_run URL REV

and the server should pass a message to worker, after which it should
clone the repository at URL, checkout REV, and try to run the CI script.

It's extremely unfinished: I need to sort out the graceful shutdown, how
the server manages workers, etc.

1 files changed, 26 insertions, 0 deletions

diff --git a/src/worker_queue.h b/src/worker_queue.h
new file mode 100644
index 0000000..d5e0bb2
--- /dev/null
+++ b/src/worker_queue.h
@@ -0,0 +1,26 @@
+#ifndef __WORKER_QUEUE_H__
+#define __WORKER_QUEUE_H__
+
+#include <sys/queue.h>
+
+struct worker_queue_entry {
+	int fd;
+	STAILQ_ENTRY(worker_queue_entry) entries;
+};
+
+int worker_queue_entry_create(struct worker_queue_entry **, int fd);
+void worker_queue_entry_destroy(struct worker_queue_entry *);
+
+STAILQ_HEAD(worker_queue, worker_queue_entry);
+
+void worker_queue_create(struct worker_queue *);
+void worker_queue_destroy(struct worker_queue *);
+
+int worker_queue_is_empty(const struct worker_queue *);
+
+void worker_queue_push(struct worker_queue *, struct worker_queue_entry *);
+void worker_queue_push_head(struct worker_queue *, struct worker_queue_entry *);
+
+struct worker_queue_entry *worker_queue_pop(struct worker_queue *);
+
+#endif