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64d9c59aa1
There is one race issue between mevent callback (which is called in mevent_dispatch thread) and mevent_delete (which could be called in dev thread). And the callback is called after mevent_delete. libevent have the exactly same issue. The issue is decripted here: https://github.com/libevent/libevent/blob/master/whatsnew-2.1.txt The fixing is: We introduce a teardown callback to mevent and make sure there is no race issue between callback and teardown call. This patch updates the mevent API and the caller as well. Tracked-On: #1877 Signed-off-by: Yin Fengwei <fengwei.yin@intel.com> Acked-by: Yu Wang <yu1.wang@intel.com>
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*-
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MEVENT_H_
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#define _MEVENT_H_
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enum ev_type {
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EVF_READ,
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EVF_WRITE,
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EVF_READ_ET,
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EVF_WRITE_ET,
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EVF_TIMER, /* Not supported yet */
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EVF_SIGNAL /* Not supported yet */
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};
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struct mevent;
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struct mevent *mevent_add(int fd, enum ev_type type,
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void (*run)(int, enum ev_type, void *), void *param,
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void (*teardown)(void *), void *teardown_param);
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int mevent_enable(struct mevent *evp);
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int mevent_disable(struct mevent *evp);
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int mevent_delete(struct mevent *evp);
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int mevent_delete_close(struct mevent *evp);
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int mevent_notify(void);
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void mevent_dispatch(void);
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int mevent_init(void);
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void mevent_deinit(void);
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#define list_foreach_safe(var, head, field, tvar) \
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for ((var) = LIST_FIRST((head)); \
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(var) && ((tvar) = LIST_NEXT((var), field), 1);\
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(var) = (tvar))
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#endif /* _MEVENT_H_ */
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