qemu/thread-pool.h
Paolo Bonzini d354c7eccf 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 <pbonzini@redhat.com>
2012-10-31 10:37:48 +01:00

35 lines
955 B
C

/*
* QEMU block layer thread pool
*
* Copyright IBM, Corp. 2008
* Copyright Red Hat, Inc. 2012
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Paolo Bonzini <pbonzini@redhat.com>
*
* 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