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Kernel: Some futex improvements

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This adds support for FUTEX_WAKE_OP, FUTEX_WAIT_BITSET, FUTEX_WAKE_BITSET,
FUTEX_REQUEUE, and FUTEX_CMP_REQUEUE, as well well as global and private
futex and absolute/relative timeouts against the appropriate clock. This
also changes the implementation so that kernel resources are only used when
a thread is blocked on a futex.

Global futexes are implemented as offsets in VMObjects, so that different
processes can share a futex against the same VMObject despite potentially
being mapped at different virtual addresses.
This commit is contained in:
Tom 2020-12-21 23:21:58 -07:00 • committed by Andreas Kling
parent 7581b64705
commit 1d621ab172
23 changed files with 928 additions and 63 deletions
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Meta/CMake/all_the_debug_macros.cmake
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@ -60,6 +60,8 @@ add_compile_definitions("FIFO_DEBUG")
add_compile_definitions("FILEDESCRIPTION_DEBUG")
add_compile_definitions("FILL_PATH_DEBUG")
add_compile_definitions("FORK_DEBUG")
add_compile_definitions("FUTEXQUEUE_DEBUG")
add_compile_definitions("FUTEX_DEBUG")
add_compile_definitions("GBOXLAYOUT_DEBUG")
add_compile_definitions("GEMINIJOB_DEBUG")
add_compile_definitions("GEMINI_DEBUG")