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futex: Support Windows

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Windows supports futex-like APIs since Windows 8 and Windows Server
2012.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Link: https://lore.kernel.org/r/20250529-event-v5-2-53b285203794@daynix.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Akihiko Odaki 2025-05-29 14:45:51 +09:00 • committed by Paolo Bonzini
parent 6e2d11bf04
commit 1bc2c49539
6 changed files with 53 additions and 17 deletions
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4
util/qemu-thread-posix.c
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@ -345,7 +345,7 @@ static inline void qemu_futex_wait(QemuEvent *ev, unsigned val)
/* Valid transitions:
* - free->set, when setting the event
* - busy->set, when setting the event, followed by qemu_futex_wake
* - busy->set, when setting the event, followed by qemu_futex_wake_all
* - set->free, when resetting the event
* - free->busy, when waiting
*
@ -400,7 +400,7 @@ void qemu_event_set(QemuEvent *ev)
smp_mb__after_rmw();
if (old == EV_BUSY) {
/* There were waiters, wake them up. */
qemu_futex_wake(ev, INT_MAX);
qemu_futex_wake_all(ev);
}
}
}