In this paper, we present the implementation of a multi-threaded software application for pre-crash obstacle detection, using stereo vision, and the "V-disparity" algorithm, that requires intensive computation. This application runs on a generic, low cost, massively parallel, multi-processor system-on-chip (MP-SoC). This hardware architecture is suitable for automotive area with respect to performance, cost, and flexibility constraints. This hardware/software embedded application is able to process 40 stereoscopic pairs per second with 256 lines of 512 pixels images and a disparity range of 256. Our architecture is made of 8 clusters, 30 general-purpose 32-bit processors and 750 Kbytes embedded memory.