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| author | Björn Gustavsson <[email protected]> | 2016-09-05 16:16:23 +0200 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2016-09-14 12:54:54 +0200 |
| commit | c70ca686fe269db6079a2ca1c7e09cdfc0cfa903 (patch) | |
| tree | fa9d97ff6a1f50a7532f4ebe38f70937bc035359 /erts/emulator/beam/atom.names | |
| parent | 176b7c94e4146a65ccd2bd729d58487098dddd9c (diff) | |
| download | otp-c70ca686fe269db6079a2ca1c7e09cdfc0cfa903.tar.gz otp-c70ca686fe269db6079a2ca1c7e09cdfc0cfa903.tar.bz2 otp-c70ca686fe269db6079a2ca1c7e09cdfc0cfa903.zip | |
Don't leak old code when loading a modules with an on_load function
Normally, calling code:delete/1 before re-loading the code for a
module is unnecessary but causes no problem.
But there will be be problems if the new code has an on_load function.
Code with an on_load function will always be loaded as old code
to allowed it to be easily purged if the on_load function would fail.
If the on_load function succeeds, the old and current code will be
swapped.
So in the scenario where code:delete/1 has been called explicitly,
there is old code but no current code. Loading code with an
on_load function will cause the reference to the old code to be
overwritten. That will at best cause a memory leak, and at worst
an emulator crash (especially if NIFs are involved).
To avoid that situation, we will put the code with the on_load
function in a special, third slot in Module.
ERL-240
Diffstat (limited to 'erts/emulator/beam/atom.names')
| -rw-r--r-- | erts/emulator/beam/atom.names | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names index 9dae67cb2d..2b66bf6f4e 100644 --- a/erts/emulator/beam/atom.names +++ b/erts/emulator/beam/atom.names @@ -505,6 +505,7 @@ atom port_limit atom port_op atom positive atom prepare +atom prepare_on_load atom print atom priority atom private |