Refine comments in code regarding DllMain-based threads registration

* include/gc/gc.h (GC_use_threads_discovery): Refine comment (mention
GC_register_my_thread and GC_init).
* os_dep.c [MSWIN32 || MSWINCE] (GC_get_stack_base): Add comment about
the GC lock.
* win32_threads.c (GC_CreateThread): Add comment about GC_init_parallel
if GC_win32_dll_threads set by GC_use_threads_discovery().
* win32_threads.c [!GC_PTHREADS && !GC_NO_THREADS_DISCOVERY]
(GC_DllMain): Add more comments for DLL_THREAD_ATTACH case.

1 files changed, 1 insertions, 0 deletions

diff --git a/os_dep.c b/os_dep.c
index 306bf1c3..59047092 100644
--- a/os_dep.c
+++ b/os_dep.c
@@ -781,6 +781,7 @@ GC_INNER size_t GC_page_size = 0;
       return buf.RegionSize;
     }
 
+    /* Should not acquire the GC lock as it is used by GC_DllMain.      */
     GC_API int GC_CALL GC_get_stack_base(struct GC_stack_base *sb)
     {
       ptr_t trunc_sp;