os_windows.inline.hpp revision 6218:be5c9920f0e1 
1/*
2 * Copyright (c) 1997, 2014, 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.inline.hpp"
29#include "runtime/os.hpp"
30
31#ifdef TARGET_OS_ARCH_windows_x86
32# include "orderAccess_windows_x86.inline.hpp"
33#endif
34
35inline const char* os::file_separator()                { return "\\"; }
36inline const char* os::line_separator()                { return "\r\n"; }
37inline const char* os::path_separator()                { return ";"; }
38inline const char* os::dll_file_extension()            { return ".dll"; }
39
40inline const int os::default_file_open_flags() { return O_BINARY | O_NOINHERIT;}
41
42// File names are case-insensitive on windows only
43inline int os::file_name_strcmp(const char* s, const char* t) {
44  return _stricmp(s, t);
45}
46
47inline void  os::dll_unload(void *lib) {
48  ::FreeLibrary((HMODULE)lib);
49}
50
51inline void* os::dll_lookup(void *lib, const char *name) {
52  return (void*)::GetProcAddress((HMODULE)lib, name);
53}
54
55// Used to improve time-sharing on some systems
56inline void os::loop_breaker(int attempts) {}
57
58inline bool os::obsolete_option(const JavaVMOption *option) {
59  return false;
60}
61
62inline bool os::uses_stack_guard_pages() {
63  return os::win32::is_nt();
64}
65
66inline bool os::allocate_stack_guard_pages() {
67  assert(uses_stack_guard_pages(), "sanity check");
68  return true;
69}
70
71inline int os::readdir_buf_size(const char *path)
72{
73  /* As Windows doesn't use the directory entry buffer passed to
74     os::readdir() this can be as short as possible */
75
76  return 1;
77}
78
79// Bang the shadow pages if they need to be touched to be mapped.
80inline void os::bang_stack_shadow_pages() {
81  // Write to each page of our new frame to force OS mapping.
82  // If we decrement stack pointer more than one page
83  // the OS may not map an intervening page into our space
84  // and may fault on a memory access to interior of our frame.
85  address sp = current_stack_pointer();
86  for (int pages = 1; pages <= StackShadowPages; pages++) {
87    *((int *)(sp - (pages * vm_page_size()))) = 0;
88  }
89}
90
91inline bool os::numa_has_static_binding()   { return true;   }
92inline bool os::numa_has_group_homing()     { return false;  }
93
94inline size_t os::read(int fd, void *buf, unsigned int nBytes) {
95  return ::read(fd, buf, nBytes);
96}
97
98inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
99  return ::read(fd, buf, nBytes);
100}
101
102inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
103  return ::write(fd, buf, nBytes);
104}
105
106inline int os::close(int fd) {
107  return ::close(fd);
108}
109
110inline bool os::supports_monotonic_clock() {
111  return win32::_has_performance_count;
112}
113
114#define CALL_TEST_FUNC_WITH_WRAPPER_IF_NEEDED(f) \
115        os::win32::call_test_func_with_wrapper(f)
116
117#endif // OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP
118