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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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2
Kernel/Syscalls/execve.cpp
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@ -530,7 +530,7 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
current_thread->set_default_signal_dispositions();
current_thread->clear_signals();
m_futex_queues.clear();
clear_futex_queues_on_exec();
m_region_lookup_cache = {};