whisper.cpp

a2886fba - Fix race conditions in threadpool when dealing with dynamic/frequent n_threads changes (llama/17748)

Fix race conditions in threadpool when dealing with dynamic/frequent n_threads changes (llama/17748) * tests: update barrier test to check for race condition in active threads * cpu: combine n_graph and n_threads into a single atomic update * tests: add multi-graph test for test_barrier