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| author | Ben Gamari <bgamari.foss@gmail.com> | 2015-11-26 00:24:42 +0100 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2015-11-26 00:25:45 +0100 |
| commit | 9aa94586fde73e818e32e5cc0e6420f6ed36a80b (patch) | |
| tree | cc9d8f62375f0b253c85c572110cdc07185ae6d0 | |
| parent | e9136762ee984451c45cd1067a41d7b7d5be0e19 (diff) | |
| download | haskell-9aa94586fde73e818e32e5cc0e6420f6ed36a80b.tar.gz | |
Note STM's vulnerability to non-allocating loops
Test Plan: Read it
Reviewers: austin, fryguybob
Reviewed By: austin
Subscribers: thomie, fryguybob
Differential Revision: https://phabricator.haskell.org/D1523
GHC Trac Issues: #10639, #367
| -rw-r--r-- | docs/users_guide/bugs.rst | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/docs/users_guide/bugs.rst b/docs/users_guide/bugs.rst index 944925ae34..55551ea65a 100644 --- a/docs/users_guide/bugs.rst +++ b/docs/users_guide/bugs.rst @@ -372,12 +372,14 @@ Bugs in GHC - GHC's runtime system implements cooperative multitasking, with context switching potentially occurring only when a program allocates. This means that programs that do not allocate may never - context switch. See :ghc-ticket:`367` for further discussion. + context switch. This is especially true of programs using STM, which + may deadlock after observing inconsistent state. See :ghc-ticket:`367` + for further discussion. If you are hit by this, you may want to compile the affected module - with ``-fno-omit-yields``. This flag ensures that yield points are - inserted at every function entrypoint (at the expense of a bit of - performance). + with ``-fno-omit-yields`` (see :ref:`options-f`). This flag ensures that + yield points are inserted at every function entrypoint (at the expense of a + bit of performance). - GHC can warn about non-exhaustive or overlapping patterns (see :ref:`options-sanity`), and usually does so correctly. But not |