From 05d69bf75c316d5593b0e2a47527ec90281a73a4 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Wed, 20 Nov 2013 23:07:02 +1100
Subject: [PATCH] Provide a function to discard queued work based on age.
 (NOTE: may be unused)

---
 cgminer.c | 24 ++++++++++++++++++++++++
 miner.h   |  1 +
 2 files changed, 25 insertions(+)

diff --git a/cgminer.c b/cgminer.c
index d0077190..78b7d00e 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -6251,6 +6251,30 @@ void __work_completed(struct cgpu_info *cgpu, struct work *work)
 	cgpu->queued_count--;
 	HASH_DEL(cgpu->queued_work, work);
 }
+
+/* This iterates over a queued hashlist finding work started more than secs
+ * seconds ago and discards the work as completed. The driver must set the
+ * work->tv_work_start value appropriately. Returns the number of items aged. */
+int age_queued_work(struct cgpu_info *cgpu, double secs)
+{
+	struct work *work, *tmp;
+	struct timeval tv_now;
+	int aged = 0;
+
+	cgtime(&tv_now);
+
+	wr_lock(&cgpu->qlock);
+	HASH_ITER(hh, cgpu->queued_work, work, tmp) {
+		if (tdiff(&tv_now, &work->tv_work_start) > secs) {
+			__work_completed(cgpu, work);
+			aged++;
+		}
+	}
+	wr_unlock(&cgpu->qlock);
+
+	return aged;
+}
+
 /* This function should be used by queued device drivers when they're sure
  * the work struct is no longer in use. */
 void work_completed(struct cgpu_info *cgpu, struct work *work)
diff --git a/miner.h b/miner.h
index 60c97cde..04be7d04 100644
--- a/miner.h
+++ b/miner.h
@@ -1368,6 +1368,7 @@ extern struct work *__find_work_bymidstate(struct work *que, char *midstate, siz
 extern struct work *find_queued_work_bymidstate(struct cgpu_info *cgpu, char *midstate, size_t midstatelen, char *data, int offset, size_t datalen);
 extern struct work *clone_queued_work_bymidstate(struct cgpu_info *cgpu, char *midstate, size_t midstatelen, char *data, int offset, size_t datalen);
 extern void __work_completed(struct cgpu_info *cgpu, struct work *work);
+extern int age_queued_work(struct cgpu_info *cgpu, double secs);
 extern void work_completed(struct cgpu_info *cgpu, struct work *work);
 extern struct work *take_queued_work_bymidstate(struct cgpu_info *cgpu, char *midstate, size_t midstatelen, char *data, int offset, size_t datalen);
 extern void hash_driver_work(struct thr_info *mythr);