* to create the SIMIX synchro. It can raise a host_error exception if the host crashed.
*
* @param name Name of the execution synchro to create
+ * @param category Tracing category
* @param flops_amount amount Computation amount (in flops)
* @param priority computation priority
- * @param bound
+ * @param bound Maximal speed for this execution (in flops) or -1 if no limit
* @param host host where the synchro will be executed
* @return A new SIMIX execution synchronization
*/