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Have iomux_update_events be a no-op if the events didn't change

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Nils O. Selåsdal
2013-12-26 03:20:47 +01:00
parent 9756ca0aeb
commit 0bb42dc235
2 changed files with 15 additions and 17 deletions
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include/ucore/iomux.h
+5 -15
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@@ -105,20 +105,11 @@ int iomux_register_fd(struct IOMux *mux, struct IOMuxFD *fd);
*/
int iomux_unregister_fd(struct IOMux *mux, struct IOMuxFD *fd);
/** Updates the events to watch for in fd->what
/** Updates the events to watch for
*
* @return 0 on success, an errno value on error
*/
int iomux_update_events(struct IOMux *mux, struct IOMuxFD *fd);
/**
* Convenience macro for setting the new event
*/
#define iomux_set_event(mux, fd, what_)\
({\
(fd)->what = (what_);\
iomux_update_events((mux), (fd));\
})
int iomux_update_events(struct IOMux *mux, struct IOMuxFD *fd, unsigned int what);
/**
* Convenience macro for clearing the new event
@@ -126,15 +117,14 @@ int iomux_update_events(struct IOMux *mux, struct IOMuxFD *fd);
#define iomux_clear_event(mux, fd, what_)\
({\
(fd)->what &= ~(what_);\
iomux_update_events((mux), (fd));\
iomux_update_events((mux), (fd), (fd)->what & ~(what_));\
})
/**
* Convenience macro for adding the new event to the existing events
*/
#define iomux_add_event(mux, fd, what_)\
({\
(fd)->what &= (what_);\
iomux_update_events((mux), (fd));\
iomux_update_events((mux), (fd), (fd)->what | (what_));\
})
/** @return a UCTimer instance tied to this mux.