Module rustc_data_structures::sync::parallel

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This module defines parallel operations that are implemented in one way for the serial compiler, and another way the parallel compiler.




  • A guard used to hold panics that occur during a parallel section to later by unwound. This is used for the parallel compiler to prevent fatal errors from non-deterministically hiding errors by ensuring that everything in the section has completed executing before continuing with unwinding. It’s also used for the non-parallel code to ensure error message output match the parallel compiler for testing purposes.


  • This gives access to a fresh parallel guard in the closure and will unwind any panics caught in it after the closure returns.