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From c1c69c1b13d64f7d892c8b661714fe388b1a6047 Mon Sep 17 00:00:00 2001
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From: Eric Blake <eblake@redhat.com>
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Date: Wed, 20 Aug 2014 16:40:09 +0200
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Subject: [PATCH 2/7] blockjob: Add block_job_yield()
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Message-id: <1408552814-23031-3-git-send-email-eblake@redhat.com>
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Patchwork-id: 60644
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O-Subject: [qemu-kvm-rhev 7.0.z PATCH 2/7] blockjob: Add block_job_yield()
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Bugzilla: 1132806
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Fam Zheng <famz@redhat.com>
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This will unset busy flag and put coroutine to sleep, can be used to
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wait for QMP complete/cancel.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit dc71ce45ded4e872e25c2de32d5e7a71842b0985)
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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blockjob.c | 14 ++++++++++++++
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include/block/blockjob.h | 8 ++++++++
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2 files changed, 22 insertions(+), 0 deletions(-)
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diff --git a/blockjob.c b/blockjob.c
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index a4430a0..1117ee7 100644
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--- a/blockjob.c
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+++ b/blockjob.c
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@@ -206,6 +206,20 @@ void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns)
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job->busy = true;
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}
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+void block_job_yield(BlockJob *job)
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+{
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+ assert(job->busy);
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+
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+ /* Check cancellation *before* setting busy = false, too! */
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+ if (block_job_is_cancelled(job)) {
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+ return;
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+ }
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+
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+ job->busy = false;
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+ qemu_coroutine_yield();
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+ job->busy = true;
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+}
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+
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BlockJobInfo *block_job_query(BlockJob *job)
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{
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BlockJobInfo *info = g_new0(BlockJobInfo, 1);
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diff --git a/include/block/blockjob.h b/include/block/blockjob.h
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index 5a7d859..11f7c7e 100644
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--- a/include/block/blockjob.h
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+++ b/include/block/blockjob.h
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@@ -144,6 +144,14 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
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void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns);
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/**
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+ * block_job_yield:
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+ * @job: The job that calls the function.
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+ *
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+ * Yield the block job coroutine.
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+ */
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+void block_job_yield(BlockJob *job);
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+
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+/**
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* block_job_completed:
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* @job: The job being completed.
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* @ret: The status code.
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--
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1.7.1
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