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Estimated hours taken: 7 Branches: main Add support for thread-local backjumping in grades that support concurrency. library/backjump.m: Shift the C definition of backjump handlers and choice ids into the runtime. This is needed because MR_Context now refers to them and the runtime should not depend on the library. Delete the XXX comment regarding pred_is_external/3. (This has been fixed below.) runtime/mercury_backjump.h: runtime/mercury_backjump.c: New module that defines those parts of the backjumping support that the runtime requires access to. In high-level C .par grades make the global state required by backjumping thread-specific. Conform to the usual coding conventions in the runtime in the new versions of the data structures that were originally in backjump.m. Rename ML_Choice_Id to MR_BackJumpChoiceId, the latter is less ambiguous. runtime/mercury_context.h: runtime/mercury_context.c: In low-level C grades add two extra fields to the MR_Context structure to hold the global state required by backjumping. In high-level C .par grades initialise the the thread-specific data that is used to store the backjump global state at program startup. Reformat a function prototype. runtime/mercury_thread.h: Reformat a function prototype. runtime/Mmakefile: Include the new files. mdbcomp/program_representation.m: Update pred_is_external/3 to include backjump.builtin_choice_id/1 and backjump.builtin_backjump/1. tests/hard_coded/Mmakefile: tests/hard_coded/tl_backjump_test.m: tests/hard_coded/tl_backjump_test.exp: Test thread-local backjumping. tests/hard_coded/tl_backjump_test.exp2: Expected output for the above test case for grades in which spawn/3 does not work.
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2 lines
36 B
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spawn/3 not supported in this grade
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