ostd::sync::guard

Enum WriteIrqDisabled

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pub enum WriteIrqDisabled {}
Expand description

A guardian that disables IRQs while holding a write lock.

This guardian should only be used for a RwLock. Using it with a SpinLock will behave in the same way as using LocalIrqDisabled.

When using this guardian with a RwLock, holding the read lock will only disable preemption, but holding a write lock will disable local IRQs. The user must ensure that the IRQ handlers never take the write lock, so we can take the read lock without disabling IRQs, but we are still free of deadlock even if the IRQ handlers are triggered in the middle.

Trait Implementations§

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impl SpinGuardian for WriteIrqDisabled

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type Guard = DisabledLocalIrqGuard

The guard type for holding a spin lock or a spin-based write lock.
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type ReadGuard = DisabledPreemptGuard

The guard type for holding a spin-based read lock.
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fn guard() -> Self::Guard

Creates a new guard.
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fn read_guard() -> Self::ReadGuard

Creates a new read guard.

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