Add tryReadChan to Chan
Now that isEmptyChan
is deprecated (#4154 (closed)) it would be useful to add tryReadChan
. It seems it is possible to define it so that it does not block like isEmptyChan
. This is because semantics is a bit different: tryReadChan
is allowed to return Nothing
also when Chan
is non-empty, but it would block. Contrary, isEmptyChan
is expected that it would return False
only if Chan
is really empty.
I have defined also two new MVar
functions which helped me implementing tryReadChan
: tryReadMVar
and tryModifyMVar
. Probably it would be useful to make them public.
Please comment. I propose three weeks for discussion.
Trac metadata
Trac field | Value |
---|---|
Version | 7.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | mmitar@gmail.com |
Operating system | |
Architecture |