Method do_alloc_stack

src/iocore/eventsystem/UnixEventProcessor.cc:196–224

}

void *
ThreadAffinityInitializer::do_alloc_stack(size_t stacksize)
{
  size_t pagesize = ats_hugepage_enabled() ? ats_hugepage_size() : ats_pagesize();
  int    stackguard_pages;
  REC_ReadConfigInteger(stackguard_pages, "proxy.config.thread.default.stackguard_pages");
  ink_release_assert(stackguard_pages >= 0);

  size_t size       = INK_ALIGN(stacksize + stackguard_pages * pagesize, pagesize);
  int    mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
#ifdef MAP_HUGETLB
  if (ats_hugepage_enabled()) {
    mmap_flags |= MAP_HUGETLB;
  }
#endif
  void *stack_and_guard = mmap(nullptr, size, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
  if (stack_and_guard == MAP_FAILED) {
    Error("Failed to allocate stack pages: size = %zu", size);
    return nullptr;
  }

  setup_stack_guard(stack_and_guard, stackguard_pages);

  void *stack_begin = static_cast<char *>(stack_and_guard) + stackguard_pages * pagesize;
  Dbg(dbg_ctl_iocore_thread, "Allocated %zu bytes (%zu bytes in guard pages) for stack {%p-%p guard, %p-%p stack}", size,
      stackguard_pages * pagesize, stack_and_guard, stack_begin, stack_begin, static_cast<char *>(stack_begin) + stacksize);

  return stack_begin;
}

#if TS_USE_HWLOC
void