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#7418 - circumvent use of timer threads to make WASM integration of z3 easier

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The scoped_timer uses a std::therad. Spawning this thread fails in cases of WASM.
Instead of adapting builds and using async features at the level of WASM and the client, we expose a specialized version of z3 that doesn't use threads at all, neither for solvers nor for timers.
The tradeoff is that the periodic poll that checks for timeout directly queries the global clock each time.
We characterize it as based on polling.
This commit is contained in:
Nikolaj Bjorner 2024-11-21 11:20:05 -08:00
parent 94f0aff47f
commit 71bad7159b
8 changed files with 124 additions and 31 deletions
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README-CMake.md
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@ -310,6 +310,7 @@ The following useful options can be passed to CMake whilst configuring.
* ``Z3_BUILD_TEST_EXECUTABLES`` - BOOL. If set to ``TRUE`` build the z3 test executables. Defaults to ``TRUE`` unless z3 is being built as a submodule in which case it defaults to ``FALSE``.
* ``Z3_SAVE_CLANG_OPTIMIZATION_RECORDS`` - BOOL. If set to ``TRUE`` saves Clang optimization records by setting the compiler flag ``-fsave-optimization-record``.
* ``Z3_SINGLE_THREADED`` - BOOL. If set to ``TRUE`` compiles Z3 for single threaded mode.
* ``Z3_POLLING_TIMER`` - BOOL. If set to ``TRUE`` compiles Z3 to use polling based timer instead of requiring a thread. This is useful for wasm builds and avoids spawning threads that interfere with how WASM is run.
On the command line these can be passed to ``cmake`` using the ``-D`` option. In ``ccmake`` and ``cmake-gui`` these can be set in the user interface.