1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP
  26 #define OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP
  27 
  28 #include "runtime/os.hpp"
  29 #include "runtime/thread.hpp"
  30 
  31 inline const char* os::dll_file_extension()            { return ".dll"; }
  32 
  33 inline const int os::default_file_open_flags() { return O_BINARY | O_NOINHERIT;}
  34 
  35 // File names are case-insensitive on windows only
  36 inline int os::file_name_strcmp(const char* s, const char* t) {
  37   return _stricmp(s, t);
  38 }
  39 
  40 inline void  os::dll_unload(void *lib) {
  41   ::FreeLibrary((HMODULE)lib);
  42 }
  43 
  44 inline void* os::dll_lookup(void *lib, const char *name) {
  45   return (void*)::GetProcAddress((HMODULE)lib, name);
  46 }
  47 
  48 inline bool os::obsolete_option(const JavaVMOption *option) {
  49   return false;
  50 }
  51 
  52 inline bool os::uses_stack_guard_pages() {
  53   return true;
  54 }
  55 
  56 inline bool os::allocate_stack_guard_pages() {
  57   return true;
  58 }
  59 
  60 inline int os::readdir_buf_size(const char *path)
  61 {
  62   /* As Windows doesn't use the directory entry buffer passed to
  63      os::readdir() this can be as short as possible */
  64 
  65   return 1;
  66 }
  67 
  68 // Bang the shadow pages if they need to be touched to be mapped.
  69 inline void os::map_stack_shadow_pages() {
  70   // Write to each page of our new frame to force OS mapping.
  71   // If we decrement stack pointer more than one page
  72   // the OS may not map an intervening page into our space
  73   // and may fault on a memory access to interior of our frame.
  74   address sp = current_stack_pointer();
  75   for (size_t pages = 1; pages <= (JavaThread::stack_shadow_zone_size() / os::vm_page_size()); pages++) {
  76     *((int *)(sp - (pages * vm_page_size()))) = 0;
  77   }
  78 }
  79 
  80 inline bool os::numa_has_static_binding()   { return true;   }
  81 inline bool os::numa_has_group_homing()     { return false;  }
  82 
  83 inline size_t os::read(int fd, void *buf, unsigned int nBytes) {
  84   return ::read(fd, buf, nBytes);
  85 }
  86 
  87 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
  88   return ::read(fd, buf, nBytes);
  89 }
  90 
  91 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
  92   return ::write(fd, buf, nBytes);
  93 }
  94 
  95 inline int os::close(int fd) {
  96   return ::close(fd);
  97 }
  98 
  99 inline bool os::supports_monotonic_clock() {
 100   return true;
 101 }
 102 
 103 inline void os::exit(int num) {
 104   win32::exit_process_or_thread(win32::EPT_PROCESS, num);
 105 }
 106 
 107 #endif // OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP