feat(job-queue): first draft of job struct

include/vieter_job_queue.h

@@ -0,0 +1,32 @@
+#ifndef VIETER_JOB_QUEUE
+#define VIETER_JOB_QUEUE
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "vieter_cron.h"
+
+/*
+ * The order of these do not imply that they happen in this order. New states
+ * will just get added as consecutive numbers. Their values should be
+ * monotonically increasing values, as these will be used to index arrays, among
+ * other things.
+ */
+typedef enum vieter_job_state {
+    vieter_job_queued = 0,
+    vieter_job_dispatched = 1,
+    vieter_job_finished = 2
+} vieter_job_state;
+
+// This macro should be kept in sync with the above enum
+#define VIETER_JOB_STATES 3
+
+typedef struct vieter_job {
+    int id;
+    uint64_t next_scheduled_time;
+    vieter_cron_expression *ce;
+    bool single;
+    vieter_job_state state;
+    uint64_t state_transition_times[VIETER_JOB_STATES];
+} vieter_job;
+
+#endif