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Support custom slot suppliers #90

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Support custom slot suppliers#90
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kind/enhancementImprovements to existing feature.size/SSmall task. (A couple of hours of work.)status/needs-designNeeds further discussion and a concrete proposal.
@FranzBusch

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@FranzBusch
FranzBusch
opened on Mar 11, 2026

The SlotSupplier type currently supports .fixedSize and .resourceBased variants. The bridge FFI layer also supports a Custom one with callback-based slot suppliers (TemporalCoreCustomSlotSupplierCallbacks), allowing users to implement their own slot allocation logic.

A custom slot supplier requires implementing these callbacks via a Swift protocol:

  • reserveSlot — async reservation of a slot (called when a task needs a slot)
  • tryReserveSlot — non-blocking attempt to reserve a slot
  • markSlotUsed — called after a reserved slot begins processing a task
  • releaseSlot — called when a task completes and its slot is freed
  • availableSlots — returns the current number of available slots

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