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GL_COMPLETION_STATUS_KHR in both object getters, reading the non-joining node-direct state - the one query that must never block is asserted never to reach a join gate. glMaxShaderCompilerThreadsKHR/ARB share one implementation: a zero count suspends async FIRST and then joins every outstanding compile and link this context owns (suspend-before-join is the only order whose post-condition is 'nothing in flight'), a nonzero count restores; the suspension is a process latch the extension controls, kept distinct from the configuration flag that gates the ADVERTISEMENT - an app that turned threading off has not made the extension disappear. GL_MAX_SHADER_COMPILER_THREADS_KHR reports the thread count. DriverPost gains the MobileGL-side async row (PASS/INFO naming the env knob) and an informational host-driver row backed by a new GLES capability probe. The extension string itself lands per backend in the two follow-up commits, keeping this one green stand-alone.