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authorStefan Hajnoczi <stefanha@redhat.com>2013-03-07 13:41:46 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-15 16:07:50 +0100
commitf7311ccc630d925e7351e9440b7ad8bc6f0a51de (patch)
tree7d0acbba48230b50a45cf73531e6c47920dff1ae /include
parentb811203cf2fbf83e26f8e8feb2c77784259a4cbd (diff)
downloadhqemu-f7311ccc630d925e7351e9440b7ad8bc6f0a51de.zip
hqemu-f7311ccc630d925e7351e9440b7ad8bc6f0a51de.tar.gz
threadpool: add thread_pool_new() and thread_pool_free()
ThreadPool is tied to an AioContext through its event notifier, which dictates in which AioContext the work item's callback function will be invoked. In order to support multiple AioContexts we need to support multiple ThreadPool instances. This patch adds the new/free functions. The free function deserves special attention because it quiesces remaining worker threads. This requires a new condition variable and a "stopping" flag to let workers know they should terminate once idle. We never needed to do this before since the global threadpool was not explicitly destroyed until process termination. Also stash the AioContext pointer in ThreadPool so that we can call aio_set_event_notifier() in thread_pool_free(). We didn't need to hold onto AioContext previously since there was no free function. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/block/thread-pool.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/block/thread-pool.h b/include/block/thread-pool.h
index 200703e..e1453c6 100644
--- a/include/block/thread-pool.h
+++ b/include/block/thread-pool.h
@@ -26,6 +26,11 @@
typedef int ThreadPoolFunc(void *opaque);
+typedef struct ThreadPool ThreadPool;
+
+ThreadPool *thread_pool_new(struct AioContext *ctx);
+void thread_pool_free(ThreadPool *pool);
+
BlockDriverAIOCB *thread_pool_submit_aio(ThreadPoolFunc *func, void *arg,
BlockDriverCompletionFunc *cb, void *opaque);
int coroutine_fn thread_pool_submit_co(ThreadPoolFunc *func, void *arg);
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