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ST: Replace macros with explicit code for better understanding. v7.0.7 (#4149)

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Improvements for ST(State Threads):

1. ST: Use g++ for CXX compiler.
2. ST: Remove macros for clist.
3. ST: Remove macros for global thread and vp.
4. ST: Remove macros for vp queue operations.
5. ST: Remove macros for context switch.
6. ST: Remove macros for setjmp/longjmp.
7. ST: Remove macro for stack pad.
8. ST: Refine macro for valgrind.

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Co-authored-by: Jacob Su <suzp1984@gmail.com>
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2
trunk/3rdparty/st-srs/docs/timeout_heap.txt vendored
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@ -22,7 +22,7 @@ appropriate for ST than introducing a separate array.
Thus, the new ST timeout heap works by organizing the existing
_st_thread_t objects in a balanced binary tree, just as they were
previously organized into a doubly-linked, sorted list. The global
_ST_SLEEPQ variable, formerly a linked list head, is now simply a
_st_this_vp.sleep_q variable, formerly a linked list head, is now simply a
pointer to the root of this tree, and the root node of the tree is the
thread with the earliest timeout. Each thread object has two child
pointers, "left" and "right", pointing to threads with later timeouts.