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dm: enhence the mevent API

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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>
This commit is contained in:
Yin Fengwei
2018-11-22 14:42:01 +08:00
committed by wenlingz
parent eec3a342c4
commit 64d9c59aa1
10 changed files with 52 additions and 35 deletions
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4
devicemodel/include/mevent.h
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@@ -41,8 +41,8 @@ enum ev_type {
struct mevent;
struct mevent *mevent_add(int fd, enum ev_type type,
void (*func)(int, enum ev_type, void *),
void *param);
void (*run)(int, enum ev_type, void *), void *param,
void (*teardown)(void *), void *teardown_param);
int mevent_enable(struct mevent *evp);
int mevent_disable(struct mevent *evp);
int mevent_delete(struct mevent *evp);