MemoryGuard

common_memory_manager

Struct MemoryGuard 

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pub struct MemoryGuard<M: MemoryMetrics> {
    pub(crate) state: GuardState<M>,
}
Expand description

Guard representing a slice of reserved memory.

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§state: GuardState<M>

Implementations§

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impl<M: MemoryMetrics> MemoryGuard<M>

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pub(crate) fn unlimited() -> Self

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pub(crate) fn limited( permit: OwnedSemaphorePermit, quota: MemoryQuota<M>, ) -> Self

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pub fn granted_bytes(&self) -> u64

Returns granted quota in bytes.

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pub async fn acquire_additional(&mut self, bytes: u64) -> Result<()>

Acquires additional memory, waiting if necessary until enough is available.

On success, merges the new memory into this guard.

§Errors
  • Returns error if requested bytes would exceed the manager’s total limit
  • Returns error if the semaphore is unexpectedly closed
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pub fn try_acquire_additional(&mut self, bytes: u64) -> bool

Tries to acquire additional memory without waiting.

On success, merges the new memory into this guard and returns true. On failure, returns false and leaves this guard unchanged.

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pub async fn acquire_additional_with_policy( &mut self, bytes: u64, policy: OnExhaustedPolicy, ) -> Result<()>

Acquires additional memory based on the given policy.

  • For OnExhaustedPolicy::Wait: Waits up to the timeout duration for memory to become available
  • For OnExhaustedPolicy::Fail: Returns immediately if memory is not available
§Errors
  • MemoryLimitExceeded: Requested bytes would exceed the total limit (both policies), or memory is currently exhausted (Fail policy only)
  • MemoryAcquireTimeout: Timeout elapsed while waiting for memory (Wait policy only)
  • MemorySemaphoreClosed: The internal semaphore is unexpectedly closed (rare, indicates system issue)
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pub fn release_partial(&mut self, bytes: u64) -> bool

Releases a portion of granted memory back to the pool before the guard is dropped.

Returns true if the release succeeds or is a no-op; false if the request exceeds granted.

Trait Implementations§

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impl<M: MemoryMetrics> Debug for MemoryGuard<M>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<M: MemoryMetrics> Drop for MemoryGuard<M>

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fn drop(&mut self)

Executes the destructor for this type. Read more

Auto Trait Implementations§

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impl<M> Freeze for MemoryGuard<M>
where M: Freeze,

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impl<M> !RefUnwindSafe for MemoryGuard<M>

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impl<M> Send for MemoryGuard<M>

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impl<M> Sync for MemoryGuard<M>

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impl<M> Unpin for MemoryGuard<M>
where M: Unpin,

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impl<M> !UnwindSafe for MemoryGuard<M>

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