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Initial Thread-Safe Implementation #455

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Initial Thread-Safe Implementation #455

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Commits on Jul 20, 2021

  1. Initial Thread-Safe Implementation 

    Add thread-safety to XACC/QCOR (Experimental). We introduce `_XACC_MUTEX` macro in `xacc.hpp` to turn on/off the feature (default is OFF). When the macro is ON, only a single thread can execute the following routines by using either `std::mutex` or `std::recursive_mutex`:

- User-facing API routines
   - `xacc::qalloc()`

- Backend modules
   - `QppAccelerator`
       - `execute()` (the existing shot-level parallel execution still works)
       - `apply()`
   - `NLOptimizer`
      -  `optimize()`

Also, regardless of the macro, the `NLOptimizer` class is now `xacc::Cloneable`.

Signed-off-by: Akihiro Hayashi <[email protected]>
    @ahayashi
    ahayashi committed Jul 20, 2021
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  2. Add a CMake option that turns on/off _XACC_MUTEX 

    Signed-off-by: Akihiro Hayashi <[email protected]>
    @ahayashi
    ahayashi committed Jul 20, 2021
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  3. Export _XACC_MUTEX and XACC_MULTI_THREADED 

    Signed-off-by: Akihiro Hayashi <[email protected]>
    @ahayashi
    ahayashi committed Jul 20, 2021
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