Fix race condition in assigning the pthread_t object in main thread - #25209

Fix race condition in assigning the pthread_t object in main thread#25209

juj merged 3 commits into

emscripten-core:mainemscripten-core/emscripten:mainfrom

juj:fix_thread_ptr_assignment_racejuj/emscripten:fix_thread_ptr_assignment_raceCopy head branch name to clipboard