Parallel execution environments uses strategies to create and manage multiple threads of execution, in addition its providing increased performance of applications. On the other hand, do not always exploit the resources provided by the hardware and its provide mostly programming models where part of management is usually explicit. This article presents the development and evaluation of the execution environment PLH-Env, which has as objective to exploit multi-core architectures and perform tasks implicitly. Thus, it is also presented a programming language called PLH, which removes problems thathinder parallelism and enhances the use of tasks, while much of the management of parallelism is removed from the programmer to the execution environment.