Generating and applying patches to computer program code concurrently with its execution

A computer program product for concurrently loading a plurality of new modules while code of a plurality of modules of an original computer program is loaded and executed on a computer system, the computer program product comprising a non-transitory computer-readable medium having computer-readable program code instructions stored therein comprising:

• instructions for allocating a module thread local storage (TLS) block for each thread within an initial computer program, wherein the module TLS blocks are large enough to hold all module thread variables that are loaded or to be loaded, and wherein the module TLS blocks are allocated consecutively, with the same layout for each thread;
• instructions for providing constant offsets between module TLS block pointers corresponding to the module TLS blocks and the module thread variables for all of the threads;
• and
• instructions for reserving spare areas between the module TLS blocks for adding new module thread variables.

A data processing system comprising:

• a processor;
• and
• a memory storing a program, which, when executed on the processor, performs an operation of concurrently loading a plurality of new modules while code of a plurality of modules of an original computer program is loaded and executed on a computer system, the operation comprising:
• allocating a module thread local storage (TLS) block for each thread within an initial computer program, wherein the module TLS blocks are large enough to hold all module thread variables that are loaded or to be loaded, and wherein the module TLS blocks are allocated consecutively, with the same layout for each thread;
• providing constant offsets between module TLS block pointers corresponding to the module TLS blocks and the module thread variables for all of the threads;
• and
• reserving spare areas between the module TLS blocks for adding new module thread variables.