aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/beam/erl_fun.h
diff options
context:
space:
mode:
authorBjörn Gustavsson <bjorn@erlang.org>2016-09-05 16:16:23 +0200
committerBjörn Gustavsson <bjorn@erlang.org>2016-09-14 12:54:54 +0200
commitc70ca686fe269db6079a2ca1c7e09cdfc0cfa903 (patch)
treefa9d97ff6a1f50a7532f4ebe38f70937bc035359 /erts/emulator/beam/erl_fun.h
parent176b7c94e4146a65ccd2bd729d58487098dddd9c (diff)
downloadotp-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/erl_fun.h')
0 files changed, 0 insertions, 0 deletions