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Kernel: Some futex improvements
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.
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7581b64705
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23 changed files with 928 additions and 63 deletions
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@ -38,6 +38,7 @@
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#include <Kernel/API/Syscall.h>
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#include <Kernel/FileSystem/InodeMetadata.h>
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#include <Kernel/Forward.h>
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#include <Kernel/FutexQueue.h>
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#include <Kernel/Lock.h>
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#include <Kernel/ProcessGroup.h>
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#include <Kernel/StdLib.h>
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@ -94,6 +95,8 @@ enum class VeilState {
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Locked,
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};
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typedef HashMap<FlatPtr, RefPtr<FutexQueue>> FutexQueues;
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class Process
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: public RefCounted<Process>
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, public InlineLinkedListNode<Process>
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@ -542,6 +545,8 @@ private:
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bool has_tracee_thread(ProcessID tracer_pid);
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void clear_futex_queues_on_exec();
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RefPtr<PageDirectory> m_page_directory;
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Process* m_prev { nullptr };
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@ -637,11 +642,11 @@ private:
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VeilState m_veil_state { VeilState::None };
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UnveilNode m_unveiled_paths { "/", { .full_path = "/", .unveil_inherited_from_root = true } };
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WaitQueue& futex_queue(Userspace<const i32*>);
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HashMap<u32, OwnPtr<WaitQueue>> m_futex_queues;
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OwnPtr<PerformanceEventBuffer> m_perf_event_buffer;
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FutexQueues m_futex_queues;
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SpinLock<u8> m_futex_lock;
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// This member is used in the implementation of ptrace's PT_TRACEME flag.
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// If it is set to true, the process will stop at the next execve syscall
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// and wait for a tracer to attach.
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