os_windows.inline.hpp revision 4030:203f64878aab 
1/*
2 * Copyright (c) 1997, 2013, 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/atomic.hpp"
29#include "runtime/atomic.inline.hpp"
30#include "runtime/os.hpp"
31
32#ifdef TARGET_OS_ARCH_windows_x86
33# include "orderAccess_windows_x86.inline.hpp"
34#endif
35
36inline const char* os::file_separator()                { return "\\"; }
37inline const char* os::line_separator()                { return "\r\n"; }
38inline const char* os::path_separator()                { return ";"; }
39inline const char* os::dll_file_extension()            { return ".dll"; }
40
41inline const int os::default_file_open_flags() { return O_BINARY | O_NOINHERIT;}
42
43// File names are case-insensitive on windows only
44inline int os::file_name_strcmp(const char* s, const char* t) {
45  return _stricmp(s, t);
46}
47
48inline void  os::dll_unload(void *lib) {
49  ::FreeLibrary((HMODULE)lib);
50}
51
52inline void* os::dll_lookup(void *lib, const char *name) {
53  return (void*)::GetProcAddress((HMODULE)lib, name);
54}
55
56// Used to improve time-sharing on some systems
57inline void os::loop_breaker(int attempts) {}
58
59inline bool os::obsolete_option(const JavaVMOption *option) {
60  return false;
61}
62
63inline bool os::uses_stack_guard_pages() {
64  return os::win32::is_nt();
65}
66
67inline bool os::allocate_stack_guard_pages() {
68  assert(uses_stack_guard_pages(), "sanity check");
69  return true;
70}
71
72inline int os::readdir_buf_size(const char *path)
73{
74  /* As Windows doesn't use the directory entry buffer passed to
75     os::readdir() this can be as short as possible */
76
77  return 1;
78}
79
80// Bang the shadow pages if they need to be touched to be mapped.
81inline void os::bang_stack_shadow_pages() {
82  // Write to each page of our new frame to force OS mapping.
83  // If we decrement stack pointer more than one page
84  // the OS may not map an intervening page into our space
85  // and may fault on a memory access to interior of our frame.
86  address sp = current_stack_pointer();
87  for (int pages = 1; pages <= StackShadowPages; pages++) {
88    *((int *)(sp - (pages * vm_page_size()))) = 0;
89  }
90}
91
92inline bool os::numa_has_static_binding()   { return true;   }
93inline bool os::numa_has_group_homing()     { return false;  }
94
95inline size_t os::read(int fd, void *buf, unsigned int nBytes) {
96  return ::read(fd, buf, nBytes);
97}
98
99inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
100  return ::read(fd, buf, nBytes);
101}
102
103inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
104  return ::write(fd, buf, nBytes);
105}
106
107inline int os::close(int fd) {
108  return ::close(fd);
109}
110#endif // OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP
111