2454   if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) {
2455     return;
2456   }
2457 
2458   MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2459 
2460   clear_external_suspend();
2461 
2462   if (is_ext_suspended()) {
2463     clear_ext_suspended();
2464     SR_lock()->notify_all();
2465   }
2466 }
2467 
2468 size_t JavaThread::_stack_red_zone_size = 0;
2469 size_t JavaThread::_stack_yellow_zone_size = 0;
2470 size_t JavaThread::_stack_reserved_zone_size = 0;
2471 size_t JavaThread::_stack_shadow_zone_size = 0;
2472 
2473 void JavaThread::create_stack_guard_pages() {
2474   if (!os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) { return; }






2475   address low_addr = stack_end();
2476   size_t len = stack_guard_zone_size();
2477 
2478   assert(is_aligned(low_addr, os::vm_page_size()), "Stack base should be the start of a page");
2479   assert(is_aligned(len, os::vm_page_size()), "Stack size should be a multiple of page size");
2480 
2481   int must_commit = os::must_commit_stack_guard_pages();
2482   // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
2483 
2484   if (must_commit && !os::create_stack_guard_pages((char *) low_addr, len)) {
2485     log_warning(os, thread)("Attempt to allocate stack guard pages failed.");
2486     return;
2487   }
2488 
2489   if (os::guard_memory((char *) low_addr, len)) {
2490     _stack_guard_state = stack_guard_enabled;
2491   } else {
2492     log_warning(os, thread)("Attempt to protect stack guard pages failed ("
2493       PTR_FORMAT "-" PTR_FORMAT ").", p2i(low_addr), p2i(low_addr + len));
2494     if (os::uncommit_memory((char *) low_addr, len)) {

2454   if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) {
2455     return;
2456   }
2457 
2458   MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2459 
2460   clear_external_suspend();
2461 
2462   if (is_ext_suspended()) {
2463     clear_ext_suspended();
2464     SR_lock()->notify_all();
2465   }
2466 }
2467 
2468 size_t JavaThread::_stack_red_zone_size = 0;
2469 size_t JavaThread::_stack_yellow_zone_size = 0;
2470 size_t JavaThread::_stack_reserved_zone_size = 0;
2471 size_t JavaThread::_stack_shadow_zone_size = 0;
2472 
2473 void JavaThread::create_stack_guard_pages() {
2474   if (!os::uses_stack_guard_pages() ||
2475       _stack_guard_state != stack_guard_unused ||
2476       (DisablePrimordialThreadGuardPages && os::is_primordial_thread())) {
2477       log_info(os, thread)("Stack guard page creation for thread "
2478                            UINTX_FORMAT " disabled", os::current_thread_id());
2479     return;
2480   }
2481   address low_addr = stack_end();
2482   size_t len = stack_guard_zone_size();
2483 
2484   assert(is_aligned(low_addr, os::vm_page_size()), "Stack base should be the start of a page");
2485   assert(is_aligned(len, os::vm_page_size()), "Stack size should be a multiple of page size");
2486 
2487   int must_commit = os::must_commit_stack_guard_pages();
2488   // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
2489 
2490   if (must_commit && !os::create_stack_guard_pages((char *) low_addr, len)) {
2491     log_warning(os, thread)("Attempt to allocate stack guard pages failed.");
2492     return;
2493   }
2494 
2495   if (os::guard_memory((char *) low_addr, len)) {
2496     _stack_guard_state = stack_guard_enabled;
2497   } else {
2498     log_warning(os, thread)("Attempt to protect stack guard pages failed ("
2499       PTR_FORMAT "-" PTR_FORMAT ").", p2i(low_addr), p2i(low_addr + len));
2500     if (os::uncommit_memory((char *) low_addr, len)) {