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[Qemu-devel] [PATCH] qemu-coroutine: Add simple work queue support
From: |
Peter A. G. Crosthwaite |
Subject: |
[Qemu-devel] [PATCH] qemu-coroutine: Add simple work queue support |
Date: |
Wed, 24 Aug 2011 17:57:51 +1000 |
Add a function co_queue_yield_to_next() which will immediately transfer
control to the coroutine at the head of a co queue. This can be used for
implementing simple work queues where the manager of a co-queue only
needs to restart queued routines one at a time.
Signed-off-by: Peter A. G. Crosthwaite <address@hidden>
---
qemu-coroutine-lock.c | 13 +++++++++++++
qemu-coroutine.h | 9 +++++++++
2 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/qemu-coroutine-lock.c b/qemu-coroutine-lock.c
index a80f437..de2fc21 100644
--- a/qemu-coroutine-lock.c
+++ b/qemu-coroutine-lock.c
@@ -75,6 +75,19 @@ bool qemu_co_queue_next(CoQueue *queue)
return (next != NULL);
}
+bool qemu_co_queue_yield_to_next(CoQueue *queue)
+{
+ Coroutine *next;
+
+ next = QTAILQ_FIRST(&queue->entries);
+ if (next) {
+ QTAILQ_REMOVE(&queue->entries, next, co_queue_next);
+ qemu_coroutine_enter(next, NULL);
+ }
+
+ return (next != NULL);
+}
+
bool qemu_co_queue_empty(CoQueue *queue)
{
return (QTAILQ_FIRST(&queue->entries) == NULL);
diff --git a/qemu-coroutine.h b/qemu-coroutine.h
index 2f2fd95..dbc3610 100644
--- a/qemu-coroutine.h
+++ b/qemu-coroutine.h
@@ -125,6 +125,15 @@ void coroutine_fn qemu_co_queue_wait(CoQueue *queue);
bool qemu_co_queue_next(CoQueue *queue);
/**
+ * Transfers control to the next coroutine in the CoQueue and removes it from
+ * the queue.
+ *
+ * Returns true once after control transfers back to caller, or false
+ * immediately if the queue is empty.
+ */
+bool qemu_co_queue_yield_to_next(CoQueue *queue)
+
+/**
* Checks if the CoQueue is empty.
*/
bool qemu_co_queue_empty(CoQueue *queue);
--
1.7.3.2
- [Qemu-devel] [PATCH] qemu-coroutine: Add simple work queue support,
Peter A. G. Crosthwaite <=