Abstract: Embodiments of the present invention provide for concurrent instruction execution in heterogeneous computer systems by forming a parallel execution context whenever a first software thread encounters a parallel execution construct. The parallel execution context may comprise a reference to instructions to be executed concurrently, a reference to data said instructions may depend on, and a parallelism level indicator whose value specifies the number of times said instructions are to be executed. The first software thread may then signal to other software threads to begin concurrent execution of instructions referenced in said context. Each software thread may then decrease the parallelism level indicator and copy data referenced in the parallel execution context to said thread's private memory location and modify said data to accommodate for the new location. Software threads may be executed by a processor and operate on behalf of other processing devices or remote computer systems.