os_windows.inline.hpp revision 11486:3950d1713ffa 
1/*
2 * Copyright (c) 1997, 2016, 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
31inline const char* os::dll_file_extension()            { return ".dll"; }
32
33inline const int os::default_file_open_flags() { return O_BINARY | O_NOINHERIT;}
34
35// File names are case-insensitive on windows only
36inline int os::file_name_strcmp(const char* s, const char* t) {
37  return _stricmp(s, t);
38}
39
40inline void  os::dll_unload(void *lib) {
41  ::FreeLibrary((HMODULE)lib);
42}
43
44inline void* os::dll_lookup(void *lib, const char *name) {
45  return (void*)::GetProcAddress((HMODULE)lib, name);
46}
47
48inline bool os::obsolete_option(const JavaVMOption *option) {
49  return false;
50}
51
52inline bool os::uses_stack_guard_pages() {
53  return true;
54}
55
56inline bool os::must_commit_stack_guard_pages() {
57  return true;
58}
59
60inline 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.
69inline void os::map_stack_shadow_pages(address sp) {
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  const int page_size = os::win32::vm_page_size();
75  const size_t n_pages = JavaThread::stack_shadow_zone_size() / page_size;
76  for (size_t pages = 1; pages <= n_pages; pages++) {
77    sp -= page_size;
78    *sp = 0;
79  }
80}
81
82inline bool os::numa_has_static_binding()   { return true;   }
83inline bool os::numa_has_group_homing()     { return false;  }
84
85inline size_t os::read(int fd, void *buf, unsigned int nBytes) {
86  return ::read(fd, buf, nBytes);
87}
88
89inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
90  return ::read(fd, buf, nBytes);
91}
92
93inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
94  return ::write(fd, buf, nBytes);
95}
96
97inline int os::close(int fd) {
98  return ::close(fd);
99}
100
101inline bool os::supports_monotonic_clock() {
102  return true;
103}
104
105inline void os::exit(int num) {
106  win32::exit_process_or_thread(win32::EPT_PROCESS, num);
107}
108
109#endif // OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP
110