Patent application number | Description | Published |
20080250400 | Method for System Call Interception in User Space - A method, and system for intercepting a system call performed by a process and for executing processing in relation with the intercepted system call from user space. The method comprises a first step for setting up, in the executing process, a signal handler performing processing in relation with an interception of a system call in the executing process upon reception of a specific signal. The executing process performs a ptrace system call with a new request, the self ptrace, which sets, in the task descriptor of the executing process, the system trace flag corresponding to the existing system trace ptrace request and set a new flag, the pt_self flag. When a system call is performed in the executing process, a new system call trace is executed testing if the pt_self flag is set. If the pt_self flag is set a specific signal is sent to the executing process itself and the handler which has been set up is executed in user space. | 10-09-2008 |
20080270770 | Method for Optimising the Logging and Replay of Mulit-Task Applications in a Mono-Processor or Multi-Processor Computer System - This invention relates to a system and method for the management, more particularly by external, transparent and non-intrusive control, of the running of one or more software tasks within a multi-task application executed on a computer or a network of computers. This management comprises in particular a recording of the running of these tasks in the form of logging data, as well as a replay of this running from such logging data in order to present a behaviour and a result corresponding to those obtained while logging. | 10-30-2008 |
20080307265 | Method for Managing a Software Process, Method and System for Redistribution or for Continuity of Operation in a Multi-Computer Architecture - This invention relates to a method for managing a software application functioning in a multi-computer architecture (cluster). This management is applied, for example, to the analysis or modification of its execution environment, in as transparent a manner as possible vis-à-vis this application. This management is applied to operations of analysis, capture and restoration of the state of one or more processes of the application. | 12-11-2008 |
20090144742 | METHOD, SYSTEM AND COMPUTER PROGRAM TO OPTIMIZE DETERMINISTIC EVENT RECORD AND REPLAY - A method, system and computer-usable medium for managing task events during the scheduling period of a task executing on one of the CPUs of a multi-processor computer. Only events of specific portions of scheduling period are logged, wherein a first shared resource access has been granted for the task, this portion of scheduling period gathering all the non-deterministic events which cannot be replayed by simple task re-execution. Other independent non-deterministic event records are still logged as usual when they occur out of the portion of scheduling period for which a record has been created. This limits the number of logged events during recording session of an application and the frequency of events to transmit from the production machine to the replay machine. | 06-04-2009 |
20090254724 | METHOD AND SYSTEM TO MANAGE MEMORY ACCESSES FROM MULTITHREAD PROGRAMS ON MULTIPROCESSOR SYSTEMS - A method, computer program and system for controlling accesses to memory by threads created by a process executing on a multiprocessor computer. A page table structure is allocated for each new thread and copied from the existing threads. The page access is controlled by a present bit and a writable bit. Upon a page fault the access is provided to one thread. The kernel handles the new page entry creation process and set the page present bits to zero which creates page faults. In a second embodiment, two page table structures are created, one for one thread having access to the address space and the other page table structure shared by all the other threads not having access to the address space. | 10-08-2009 |
20140219325 | METHOD AND MODULE FOR ESTIMATING FREQUENCY BIAS IN A DIGITAL-TELECOMMUNICATIONS SYSTEM - The invention relates to a method for estimating frequency bias negatively affecting a digital signal representative of a symbol frame, wherein said method comprises the steps of: generating the digital signal at a sampling period Te that is shorter than a predefined period of each of the symbols of the frame; calculating values for a plurality of pairs of samples of the digital signal, each value being representative of a phase difference between the samples of a pair; estimating the frequency bias negatively affecting the digital signal on the basis of the values calculated for Np pairs of samples selected such that a plurality of said Np pairs belong strictly to a single symbol in the frame. The present invention also relates to a module for implementing the estimation method, as well as to a telecommunication method and system. | 08-07-2014 |
20140321451 | Access Network For Digital Telecommunications System And Method Of Digital Telecommunications - An access network for terminals of a digital telecommunications system includes base stations adapted for receiving radiofrequency signals emitted by the terminals, each terminal a physical layer processing module adapted to form a radiofrequency signal on the basis of binary data in accordance with a predefined physical layer protocol. Moreover, for at least one base station, termed the “partial station”, an inverse physical layer processing, making it possible to extract binary data from a radiofrequency signal, is distributed between the partial station and a processing server distinct from the partial station, an inverse physical layer processing module being made up of a first inverse processing module, integrated into the partial station, and a second inverse processing module, integrated into the processing server. The invention also relates to a method of digital telecommunications. | 10-30-2014 |
Patent application number | Description | Published |
20090119549 | METHOD FOR COUNTING INSTRUCTIONS FOR LOGGING AND REPLAY OF A DETERMINISTIC SEQUENCE OF EVENTS - This invention relates to a transparent and non-intrusive method for monitoring and managing the running of tasks executed in one or more computer processors, in particular in multi-processor systems with a parallel architecture. It proposes a system and method for managing a computer task, termed target, during a given execution period, termed activity period (SchJ, SchR), within a computer system, in a computer processor provided with means of monitoring or estimating performance and including a counter (PMC) with a given possible error in plus or minus, termed relative error, this process comprising
| 05-07-2009 |
20090328044 | Transfer of Event Logs for Replication of Executing Programs - A mechanism for replicating programs executing on a computer system having a first storage means is provided. The mechanism identifies the events corresponding to requests from one executing program, which may be different from the executing program to be replicated, which are non-deterministic and identifies the ‘Non Abortable Events’ (NAE's), which change irremediably the state of the external world that need to be reproduced in the replay of the programs. These events are immediately transferred for replay and the executing program is blocked until the transfer is acknowledged. For the other non-deterministic events, they are logged and sent to the executing program, the executing programs remaining blocked only if the log is full and/or if a timer between two NAEs expires, in this case a log transfer to the standby machine is performed to prepare replication before unblocking of the executing program. | 12-31-2009 |