Daniel Samson
b3a8147bd7
New private syscalls futex_wait(addr, expected, timeout_ns)=40 and futex_wake(addr, count)=41. A waiter is a .blocked task tagged with Task.futex_addr (no queue linkage); futex_wait reads the user word under the big lock and parks only if it still equals expected, so a concurrent wake can't slip between the check and the block. futex_wake scans the task table and readies up to count waiters in the same address space. A timed wait also sets wake_at so the existing wakeExpired times it out; futex_addr staying non-zero (only futex_wake clears it) distinguishes timeout from a real wake. Waiters park in-kernel, so an idle core still halts (no busy-wait). runtime.Thread.Futex mirrors std.Thread.Futex (wait/timedWait/wake). thread-test gains a futex mode: a waiter parks, the main thread wakes it (serial order waiting/waking/woke, asserted by the case regex), and timedWait reports a timeout. Gate thread-futex PASS (3x); 18 guardrail cases green incl. sleep/event/ipc blocking paths; build + host tests clean. |
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| .. | ||
| devices | ||
| drivers | ||
| kernel | ||
| services | ||
| abi.zig | ||
| boot-handoff.zig | ||
| initial-ramdisk.zig | ||
| parameters.zig | ||