Jules Bean wrote:
Simon Marlow wrote:
Ashley Yakeley wrote:
If I have a thread that's blocked on an STM retry or TChan read, and
none of its TVars are referenced elsewhere, will it get stopped and
garbage-collected?
I have in mind a pump thread that eternally reads off a TChan and
pushes the result to some function. If the TChan is forgotten
elsewhere, will the permanently blocked thread still sit around using
up some small amount of memory, or will it be reaped by the garbage
collector?
In this case, your thread should receive the BlockedIndefinitely
exception:
http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Exception.html#v%3ABlockedIndefinitely
If the system is idle for a certain amount of time (default 0.3s,
change it with the +RTS -I option) a full GC is triggered, which will
detect any threads that are blocked on unreachable objects, and
arrange to send them the BlockedIndefinitely exception.
Including MVars? Your quoted text suggests 'Yes' but the docs you link
to suggest 'No'.
Deadlocked threads blocked on MVars instead get the BlockedOnDeadMVar
exception. Perhaps those two exceptions should be merged.
Cheers,
Simon
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