os_linux.inline.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1999, 2008, 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
25inline void* os::thread_local_storage_at(int index) {
26  return pthread_getspecific((pthread_key_t)index);
27}
28
29inline const char* os::file_separator() {
30  return "/";
31}
32
33inline const char* os::line_separator() {
34  return "\n";
35}
36
37inline const char* os::path_separator() {
38  return ":";
39}
40
41inline const char* os::jlong_format_specifier() {
42  return "%lld";
43}
44
45inline const char* os::julong_format_specifier() {
46  return "%llu";
47}
48
49// File names are case-sensitive on windows only
50inline int os::file_name_strcmp(const char* s1, const char* s2) {
51  return strcmp(s1, s2);
52}
53
54inline bool os::obsolete_option(const JavaVMOption *option) {
55  return false;
56}
57
58inline bool os::uses_stack_guard_pages() {
59  return true;
60}
61
62inline bool os::allocate_stack_guard_pages() {
63  assert(uses_stack_guard_pages(), "sanity check");
64  return true;
65}
66
67
68// On Linux, reservations are made on a page by page basis, nothing to do.
69inline void os::split_reserved_memory(char *base, size_t size,
70                                      size_t split, bool realloc) {
71}
72
73
74// Bang the shadow pages if they need to be touched to be mapped.
75inline void os::bang_stack_shadow_pages() {
76}
77
78inline DIR* os::opendir(const char* dirname)
79{
80  assert(dirname != NULL, "just checking");
81  return ::opendir(dirname);
82}
83
84inline int os::readdir_buf_size(const char *path)
85{
86  return NAME_MAX + sizeof(dirent) + 1;
87}
88
89inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
90{
91  dirent* p;
92  int status;
93  assert(dirp != NULL, "just checking");
94
95  // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
96  // version. Here is the doc for this function:
97  // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
98
99  if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
100    errno = status;
101    return NULL;
102  } else
103    return p;
104}
105
106inline int os::closedir(DIR *dirp)
107{
108  assert(dirp != NULL, "just checking");
109  return ::closedir(dirp);
110}
111
112// macros for restartable system calls
113
114#define RESTARTABLE(_cmd, _result) do { \
115    _result = _cmd; \
116  } while(((int)_result == OS_ERR) && (errno == EINTR))
117
118#define RESTARTABLE_RETURN_INT(_cmd) do { \
119  int _result; \
120  RESTARTABLE(_cmd, _result); \
121  return _result; \
122} while(false)
123
124inline bool os::numa_has_static_binding()   { return true; }
125inline bool os::numa_has_group_homing()     { return false;  }
126