[GitHub] wohali opened a new issue #1296: bcrypt support breaks couchdb on single proc platforms

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wohali opened a new issue #1296: bcrypt support breaks couchdb on single proc platforms
URL: https://github.com/apache/couchdb/issues/1296
 
 
   In analysis for #1293 I ran across this issue while testing in a VM that has only a single processor.
   
   We enable bcrypt support in `test/javascript/tests/users_db_security.js` for testing purposes. However, on a single-processor machine, this test fails.
   
   Looking at `dev/logs/node1.log` I see the following, then a crash:
   
   ```
   enif_send: env==NULL on non-SMP VM
   ```
   
   First hit on a web search was [this bug](https://github.com/basho/eleveldb/issues/120) which says that `enif_send` does not work on the non-SMP BEAM VM.
   
   Confirmed on the erlang mailing list:
   
   ```
   > On Tuesday, March 21, 2017 10:28 AM, Sverker Eriksson <[hidden email]> wrote:
   > enif_send can be called from a non scheduler thread in an SMP enabled VM
   > (beam.smp)
   > but not in a non-SMP VM (beam). 
   ```
   
   Our choices are:
   
   1. Eliminate our single call to `enif_send` [here](https://github.com/apache/couchdb-erlang-bcrypt/blob/master/c_src/bcrypt_nif.c#L126) somehow
   1. Put `-smp enable` in `vm.args` everywhere
   
   /cc @janl @davisp 
   
   As this breaks us on a lot of machines, I'm adding this to the 2.2.0 milestone to ensure we don't release without fixing this problem.

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