From d354c7eccf5466ec2715a03d3f33dbfd6680dcc5 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Thu, 23 Feb 2012 13:23:34 +0100 Subject: aio: add generic thread-pool facility Add a generic thread-pool. The code is roughly based on posix-aio-compat.c, with some changes, especially the following: - use QemuSemaphore instead of QemuCond; - separate the state of the thread from the return code of the worker function. The return code is totally opaque for the thread pool; - do not busy wait when doing cancellation. A more generic threadpool (but still specific to I/O so that in the future it can use special scheduling classes or PI mutexes) can have many uses: it allows more flexibility in raw-posix.c and can more easily be extended to Win32, and it will also be used to do an msync of the persistent bitmap. Signed-off-by: Paolo Bonzini --- thread-pool.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 thread-pool.h (limited to 'thread-pool.h') diff --git a/thread-pool.h b/thread-pool.h new file mode 100644 index 0000000000..378a4ac9f9 --- /dev/null +++ b/thread-pool.h @@ -0,0 +1,34 @@ +/* + * QEMU block layer thread pool + * + * Copyright IBM, Corp. 2008 + * Copyright Red Hat, Inc. 2012 + * + * Authors: + * Anthony Liguori + * Paolo Bonzini + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * Contributions after 2012-01-13 are licensed under the terms of the + * GNU GPL, version 2 or (at your option) any later version. + */ + +#ifndef QEMU_THREAD_POOL_H +#define QEMU_THREAD_POOL_H 1 + +#include "qemu-common.h" +#include "qemu-queue.h" +#include "qemu-thread.h" +#include "qemu-coroutine.h" +#include "block_int.h" + +typedef int ThreadPoolFunc(void *opaque); + +BlockDriverAIOCB *thread_pool_submit_aio(ThreadPoolFunc *func, void *arg, + BlockDriverCompletionFunc *cb, void *opaque); +int coroutine_fn thread_pool_submit_co(ThreadPoolFunc *func, void *arg); +void thread_pool_submit(ThreadPoolFunc *func, void *arg); + +#endif -- cgit v1.2.3