Summary:
`MountingCoordinator::waitForTransaction()` allows waiting for a new coming transaction synchronously, as efficient as waiting for a mutex.
This feature can be used to implement more high-level synchronous rendering APIs.
Reviewed By: mdvacca
Differential Revision: D17629425
fbshipit-source-id: acd91b941e4d6d43bc4518f332a1604e14506be9
Summary:
MountingCoordinator is a borderline between Core and Mounting. Some of Core design constraints are impossible/impractical to enforce on Mounting layer, so we have to handle all of those cases in `MountingCoordinator`.
One of the constrains is that all ShadowNodes implicitly depend on associated ComponentDescriptor instances without retaining them (retaining is expensive and creates a retain cycle).
The problem is that the Mounting layer can call `MountingCoordinator::pull()` at any moment (even after the whole Core is already destroyed). To prevent this, the owner of a `MountingCoordinator` on the Core side calls `revoke()` right before being deallocated (right before the moment the owner cannot guarantee the constraint).
Reviewed By: JoshuaGross
Differential Revision: D17272295
fbshipit-source-id: ba8b02eab8f84cce68aa65c1ad36950cd2498049
Andres Suarez
Valentin Shergin
Joshua Gross