ivmai / bdwgc / 1449

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Remove first_thread/crtn static variables
(refactoring)

* pthread_support.c (first_crtn, first_thread): Remove static variable.
* pthread_support.c (GC_push_thread_structures): Do not push fields of
first_crtn and first_thread.
* pthread_support.c [MPROTECT_VDB && GC_WIN32_THREADS]
(GC_win32_unprotect_thread): Do not check that crtn does not point to
first_crtn and that t does not point to first_thread.
* pthread_support.c (GC_new_thread): Move crtn local variable to outer
scope; allocate GC_thread and GC_stack_context_t objects instead of
using first_thread and first_crtn; do not check value of
first_thread.crtn; call GC_dirty(result) unconditionally.
* pthread_support.c [CPPCHECK] (GC_new_thread): Remove access of
first_thread.flags_pad, first_crtn.dummy and first_crtn.fnlz_pad.
* pthread_support.c (GC_delete_thread): Remove assertions that prev
and p do not point to first_thread, and p->crtn does not point to
first_crtn.
* pthread_support.c [!GC_WIN32_THREADS] (main_normstack, main_altstack,
main_normstack_size, main_altstack_size): New static variable.
* pthread_support.c [!GC_WIN32_THREADS] (GC_register_altstack): Move
crtn local variable to inner scope; if me is NULL then set
main_normstack, main_normstack_size, main_altstack, main_altstack_size
variables.
* pthread_support.c [CAN_HANDLE_FORK && (!THREAD_SANITIZER
|| !CAN_CALL_ATFORK)] (GC_remove_all_threads_but_me): Do not check that
p does not point to first_thread; remove assertion that p->crtn does
not point to first_crtn.
* pthread_support.c [!GC_WIN32_THREADS] (GC_thr_init): Define crtn
local variable; copy value of main_normstack, main_normstack_size,
main_altstack, main_altstack_size to the relevant fields of crtn.
* pthread_support.c [!GC_WIN32_THREADS && CPPCHECK] (GC_thr_init):
Fetch value of me->flags_pad[0].
* pthread_support.c [!GC_WIN32_THREADS && CPPCHECK && THREAD_SANITIZER
&& SIGNAL_BASED_STOP_WORLD] (GC_thr_init): Fetch value of me->dummy[0].
* pthread_support.c [!GC_WIN32_TH... (continued)

29 of 29 new or added lines in 1 file covered. (100.0%)

7775 of 10159 relevant lines covered (76.53%)

8681884.07 hits per line