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[Qemu-devel] [PATCH 06/13] Threadlet: Add dequeue_work threadlet API
From: |
Arun R Bharadwaj |
Subject: |
[Qemu-devel] [PATCH 06/13] Threadlet: Add dequeue_work threadlet API |
Date: |
Tue, 04 Jan 2011 10:57:39 +0530 |
User-agent: |
StGit/0.15 |
This patch adds dequeue_work threadlet API and shows how
the paio_cancel changes to dequeue_work.
Signed-off-by: Arun R Bharadwaj <address@hidden>
---
posix-aio-compat.c | 46 ++++++++++++++++++++++++++--------------------
1 files changed, 26 insertions(+), 20 deletions(-)
diff --git a/posix-aio-compat.c b/posix-aio-compat.c
index ff6e08b..8f1a9b6 100644
--- a/posix-aio-compat.c
+++ b/posix-aio-compat.c
@@ -574,33 +574,39 @@ static void paio_remove(struct qemu_paiocb *acb)
}
}
-static void paio_cancel(BlockDriverAIOCB *blockacb)
+/**
+ * dequeue_work: Cancel a task queued on the global queue.
+ * @work: Contains the information of the task that needs to be cancelled.
+ *
+ * Returns: 0 if the task is successfully cancelled.
+ * 1 otherwise.
+ */
+static int dequeue_work(ThreadletWork *work)
{
- struct qemu_paiocb *acb = (struct qemu_paiocb *)blockacb;
- int active = 0;
+ int ret = 1;
qemu_mutex_lock(&globalqueue.lock);
- if (!acb->active) {
- QTAILQ_REMOVE(&globalqueue.request_list, &acb->work, node);
- acb->ret = -ECANCELED;
- } else if (acb->ret == -EINPROGRESS) {
- active = 1;
- }
+ QTAILQ_REMOVE(&globalqueue.request_list, work, node);
+ ret = 0;
qemu_mutex_unlock(&globalqueue.lock);
- qemu_mutex_lock(&aiocb_mutex);
- if (!active) {
- acb->ret = -ECANCELED;
- } else {
- while (acb->ret == -EINPROGRESS) {
- /*
- * fail safe: if the aio could not be canceled,
- * we wait for it
- */
- qemu_cond_wait(&aiocb_completion, &aiocb_mutex);
+ return ret;
+}
+
+static void paio_cancel(BlockDriverAIOCB *blockacb)
+{
+ struct qemu_paiocb *acb = (struct qemu_paiocb *)blockacb;
+ if (!acb->active) {
+ if (dequeue_work(&acb->work) != 0) {
+ /* Wait for running work item to complete */
+ qemu_mutex_lock(&aiocb_mutex);
+ while (acb->ret == -EINPROGRESS) {
+ qemu_cond_wait(&aiocb_completion, &aiocb_mutex);
+ }
+ qemu_mutex_unlock(&aiocb_mutex);
}
}
- qemu_mutex_unlock(&aiocb_mutex);
+
paio_remove(acb);
}
- [Qemu-devel] Re: [PATCH 01/13] Add aiocb_mutex and aiocb_completion., (continued)
- [Qemu-devel] [PATCH 07/13] Remove active field in qemu_aiocb structure., Arun R Bharadwaj, 2011/01/04
- [Qemu-devel] [PATCH 08/13] Remove thread_create routine., Arun R Bharadwaj, 2011/01/04
- [Qemu-devel] [PATCH 09/13] Threadlet: Add aio_signal_handler threadlet API, Arun R Bharadwaj, 2011/01/04
- [Qemu-devel] [PATCH 10/13] Remove all instances of CONFIG_THREAD, Arun R Bharadwaj, 2011/01/04
- [Qemu-devel] [PATCH 11/13] Move threadlet code to qemu-threadlets.c, Arun R Bharadwaj, 2011/01/04