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Proposal for instruction set - now on Github
Author:  Date: 2016-09-08 17:24
Agner wrote:
ForwardCom has a special security feature for threads. A process can have a parent thread and several child threads. All child threads have access to the memory of the parent thread. The stack, heap and thread-local storage of a child thread is private by default, not accessible to its parent and siblings. This can be useful if the process is servicing several clients. Communication between threads - e.g. a semafor - must use the parent's memory space.

Thread memory is shared only if this is necessary for compatibility with legacy software.

If you want to port anything that uses threads on a POSIX OS (which all use the pthreads library) or on Windows, the expected behavior is that all threads share the same memory yes. For instance, if multiple threads can modify a std::vector (protected by a mutex), then if the vector changes size and its memory is reallocated, all threads have to see the newly allocated memory regardless of which thread caused the size change. Since std::vector memory allocations ultimately use malloc(), this means that malloc() has to return memory which is visible to all threads by default.
 
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