Agnes Lanusse CEA agnes.lanusse@cea.fr Patrick Vanuxeem CEA patrick.vanuxeem@cea.fr Francois-Xavier Russotto CEA russottof@zoe.cea.fr 2003 OCERA Consortium RTLinux FT Appliaction Monitor POSIX Trace Fault-Tolerance, Monitoring, Abnormal execution The FT controller component, named ftcontroller, is a low level component that handles abnormal situations (timing errors and/or abortion) and provides replacement behaviour for the faulty thread. Actually, the FT controller component is in relation with the POSIX Trace component by using a kernel stream trace in order to get system events related notably to application threads. After analysing and filtering of some particular event (PTHREAD_KILL), a decision making on the abnormal detected thread implies a transition from the normal behavior thread to the degraded behavior thread.