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user guide: add Barriers section

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Josh Holtrop 2019-07-29 21:32:04 -04:00
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doc/user_guide.md
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@ -730,6 +730,18 @@ Post-build hooks are only invoked if the build operation was a success.
Build hooks and post-build hooks can register new build targets. Build hooks and post-build hooks can register new build targets.
###> Barriers
Normally Rscons will parallelize all builders.
A barrier can be used to separate sets of build targets.
All build targets registered before the barrier is created will be built before
Rscons will schedule any build targets after the barrier.
In other words, build targets are not parallelized across a barrier.
```ruby
env.barrier
```
##> Extending Rscons ##> Extending Rscons
### Adding New Languages ### Adding New Languages