Keep stratum connections open for 2 minutes after the last work item was staged to allow stray shares to be submitted on pool switching.

cgminer.c

@@ -3663,6 +3663,7 @@ static void stage_work(struct work *work)
 {
 	applog(LOG_DEBUG, "Pushing work from pool %d to hash queue", work->pool->pool_no);
 	work->work_block = work_block;
+	work->pool->last_work_time = time(NULL);
 	test_work_current(work);
 	hash_push(work);
 }
@@ -4669,6 +4670,10 @@ static bool cnx_needed(struct pool *pool)
 		return true;
 	if (!cp->has_gbt && !cp->has_stratum && (!opt_fail_only || !cp->hdr_path))
 		return true;
+	/* Keep the connection open to allow any stray shares to be submitted
+	 * on switching pools for 2 minutes. */
+	if (time(NULL) < pool->last_work_time + 120)
+		return true;
 	return false;
 }
 

miner.h

@@ -924,6 +924,7 @@ struct pool {
 	pthread_cond_t cr_cond;
 	struct list_head curlring;
 
+	time_t last_work_time;
 	time_t last_share_time;
 	double last_share_diff;