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ke/sched: fix lock inversion in scheduler

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Taking next's lock can be a lock inversion with the turnstile code.
Use a switching field instead and spin on that.
This commit is contained in:
Loïc Grégoire
2026-07-19 20:40:50 -04:00
parent ea33fcab30
commit 878be31c7a
4 changed files with 24 additions and 9 deletions
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src/kern/amd64/impl.zig
+2 -2
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@@ -25,7 +25,7 @@ const ThreadFrame = extern struct {
extern fn asm_thread_entry() void;
extern fn do_context_switch(old: *ThreadContext, new: *ThreadContext, lock: *u8) callconv(.c) void;
extern fn do_context_switch(old: *ThreadContext, new: *ThreadContext, lock: *u8, switching: *bool) callconv(.c) void;
pub const ThreadContext = extern struct {
rsp: u64 align(1),
@@ -60,7 +60,7 @@ pub const ThreadContext = extern struct {
pub fn switch_to(self: *ThreadContext, new: *ThreadContext) callconv(.c) void {
const thread: *ke.Thread = @alignCast(@fieldParentPtr("context", self));
do_context_switch(self, new, &thread.lock.inner.locked.raw);
do_context_switch(self, new, &thread.lock.inner.locked.raw, &thread.switching.raw);
}
};