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, 79 insertions, 0 deletions

diff --git a/src/worker_queue.c b/src/worker_queue.c
new file mode 100644
index 0000000..bb0077b
--- /dev/null
+++ b/src/worker_queue.c
@@ -0,0 +1,79 @@
+#include "worker_queue.h"
+#include "log.h"
+
+#include <stdlib.h>
+#include <sys/queue.h>
+#include <unistd.h>
+
+int worker_queue_entry_create(struct worker_queue_entry **entry, int fd)
+{
+	int newfd = dup(fd);
+
+	if (newfd < 0) {
+		print_errno("malloc");
+		return -1;
+	}
+
+	*entry = malloc(sizeof(struct worker_queue_entry));
+	if (!*entry) {
+		print_errno("malloc");
+		goto close_newfd;
+	}
+	(*entry)->fd = newfd;
+
+	return 0;
+
+close_newfd:
+	close(newfd);
+
+	return -1;
+}
+
+void worker_queue_entry_destroy(struct worker_queue_entry *entry)
+{
+	close(entry->fd);
+	free(entry);
+}
+
+void worker_queue_create(struct worker_queue *queue)
+{
+	STAILQ_INIT(queue);
+}
+
+void worker_queue_destroy(struct worker_queue *queue)
+{
+	struct worker_queue_entry *entry1, *entry2;
+
+	entry1 = STAILQ_FIRST(queue);
+	while (entry1) {
+		entry2 = STAILQ_NEXT(entry1, entries);
+		worker_queue_entry_destroy(entry1);
+		entry1 = entry2;
+	}
+	STAILQ_INIT(queue);
+}
+
+int worker_queue_is_empty(const struct worker_queue *queue)
+{
+	return STAILQ_EMPTY(queue);
+}
+
+void worker_queue_push(struct worker_queue *queue, struct worker_queue_entry *entry)
+{
+	STAILQ_INSERT_TAIL(queue, entry, entries);
+}
+
+void worker_queue_push_head(struct worker_queue *queue, struct worker_queue_entry *entry)
+{
+	STAILQ_INSERT_HEAD(queue, entry, entries);
+}
+
+struct worker_queue_entry *worker_queue_pop(struct worker_queue *queue)
+{
+	struct worker_queue_entry *entry;
+
+	entry = STAILQ_FIRST(queue);
+	STAILQ_REMOVE_HEAD(queue, entries);
+
+	return entry;
+}