Dynamic seamless reconfiguration of executing parallel software

A method for performing dynamic stitching of a new module of executable code in a parallel processing environment, where said new module and another module previously loaded include accessing code which when executed causes access to a data object, the method comprising the steps of:

• receiving an instruction to load the new module;
• preventing initiation of access to the data object when the instruction is received, while permitting continued access to the data object in progress when the instruction is received;
• loading the new module after said continued access is concluded;
• and
• permitting initiation of access to the data object after said loading is performed.

A method for unloading a target module of executable code in a parallel processing environment, where the target module and another module share access to a data object, said access being performed using a data pointer associated with the target module and having a pointer value, and where the target module and the other module comprise a context having a freshness indicator associated therewith, the method comprising the steps of:

• receiving an instruction to unload the target module;
• preventing initiation of access to the target module when the instruction is received, while permitting continued access to the target module in progress when the instruction is received;
• updating the freshness indicator;
• deleting old data associated with the target module in accordance with an updated value of the freshness indicator;
• modifying the pointer value after all access to the target module is concluded, thereby terminating reference to the data object by the target module;
• and
• unloading the target module.

A computer-readable storage medium having stored therein instructions for performing a method for performing dynamic stitching of a new module of executable code in a parallel processing environment, where said new module and another module previously loaded include accessing code which when executed causes access to a data object, the method comprising the steps of:

• receiving an instruction to load the new module;
• preventing initiation of access to the data object when the instruction is received, while permitting continued access to the data object in progress when the instruction is received;
• loading the new module after said continued access is concluded;
• and
• permitting initiation of access to the data object after said loading is performed.

A computer-readable storage medium having stored therein instructions for performing a method for unloading a target module of executable code in a parallel processing environment, where the target module and another module share access to a data object, said access being performed using a data pointer associated with the target module and having a pointer value, and where the target module and the other module comprise a context having a freshness indicator associated therewith, the method comprising the steps of:

• receiving an instruction to unload the target module;
• preventing initiation of access to the target module when the instruction is received, while permitting continued access to the target module in progress when the instruction is received;
• updating the freshness indicator;
• deleting old data associated with the target module in accordance with an updated value of the freshness indicator;
• modifying the pointer value after all access to the target module is concluded, thereby terminating reference to the data object by the target module;
• and
• unloading the target module.

A computer program product embodying instructions for performing a method for performing dynamic stitching of a new module of executable code in a parallel processing environment, where said new module and another module previously loaded include accessing code which when executed causes access to a data object, the method comprising the steps of:

• receiving an instruction to load the new module;
• preventing initiation of access to the data object when the instruction is received, while permitting continued access to the data object in progress when the instruction is received;
• loading the new module after said continued access is concluded;
• and
• permitting initiation of access to the data object after said loading is performed.

A computer program product embodying instructions for performing a method for unloading a target module of executable code in a parallel processing environment, where the target module and another module share access to a data object, said access being performed using a data pointer associated with the target module and having a pointer value, and where the target module and the other module comprise a context having a freshness indicator associated therewith, the method comprising the steps of:

• receiving an instruction to unload the target module;
• preventing initiation of access to the target module when the instruction is received, while permitting continued access to the target module in progress when the instruction is received;
• updating the freshness indicator;
• deleting old data associated with the target module in accordance with an updated value of the freshness indicator;
• modifying the pointer value after all access to the target module is concluded, thereby terminating reference to the data object by the target module;
• and
• unloading the target module.