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This patch annotates APIs with low or high priority.
In low set MUST be all APIs which might eventually access monitor
(and thus block indefinitely). Other APIs may be marked as high
priority. However, some must be (e.g. domainDestroy).
For high priority calls (HPC), there are some high priority workers
(HPW) created in the pool. HPW can execute only HPC, although normal
worker can process any call regardless priority. Therefore, only those
APIs which are guaranteed to end in reasonable small amount of time
can be marked as HPC.
The size of this HPC pool is static, because HPC are expected to end
quickly, therefore jobs assigned to this pool will be served quickly.
It can be configured in libvirtd.conf via prio_workers variable.
Default is set to 5.
To mark API with low or high priority, append priority:{low|high} to
it's comment in src/remote/remote_protocol.x. This is similar to
autogen|skipgen. If not marked, the generator assumes low as default.
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/*
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* threadpool.h: a generic thread pool implementation
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*
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* Copyright (C) 2010 Hu Tao
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* Copyright (C) 2010 Daniel P. Berrange
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author:
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* Hu Tao <hutao@cn.fujitsu.com>
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* Daniel P. Berrange <berrange@redhat.com>
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*/
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#ifndef __VIR_THREADPOOL_H__
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# define __VIR_THREADPOOL_H__
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# include "internal.h"
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typedef struct _virThreadPool virThreadPool;
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typedef virThreadPool *virThreadPoolPtr;
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typedef void (*virThreadPoolJobFunc)(void *jobdata, void *opaque);
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virThreadPoolPtr virThreadPoolNew(size_t minWorkers,
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size_t maxWorkers,
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size_t prioWorkers,
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virThreadPoolJobFunc func,
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void *opaque) ATTRIBUTE_NONNULL(4);
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void virThreadPoolFree(virThreadPoolPtr pool);
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int virThreadPoolSendJob(virThreadPoolPtr pool,
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unsigned int priority,
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void *jobdata) ATTRIBUTE_NONNULL(1)
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ATTRIBUTE_RETURN_CHECK;
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#endif
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