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 
  25 inline void* os::thread_local_storage_at(int index) {
  26   return pthread_getspecific((pthread_key_t)index);
  27 }
  28 
  29 inline const char* os::file_separator() {
  30   return "/";
  31 }
  32 
  33 inline const char* os::line_separator() {
  34   return "\n";
  35 }
  36 
  37 inline const char* os::path_separator() {
  38   return ":";
  39 }
  40 
  41 inline const char* os::jlong_format_specifier() {
  42   return "%lld";
  43 }
  44 
  45 inline const char* os::julong_format_specifier() {
  46   return "%llu";
  47 }
  48 
  49 // File names are case-sensitive on windows only
  50 inline int os::file_name_strcmp(const char* s1, const char* s2) {
  51   return strcmp(s1, s2);
  52 }
  53 
  54 inline bool os::obsolete_option(const JavaVMOption *option) {
  55   return false;
  56 }
  57 
  58 inline bool os::uses_stack_guard_pages() {
  59   return true;
  60 }
  61 
  62 inline 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.
  69 inline 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.
  75 inline void os::bang_stack_shadow_pages() {
  76 }
  77 
  78 inline DIR* os::opendir(const char* dirname)
  79 {
  80   assert(dirname != NULL, "just checking");
  81   return ::opendir(dirname);
  82 }
  83 
  84 inline int os::readdir_buf_size(const char *path)
  85 {
  86   return NAME_MAX + sizeof(dirent) + 1;
  87 }
  88 
  89 inline 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 
 106 inline 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 
 124 inline bool os::numa_has_static_binding()   { return true; }
 125 inline bool os::numa_has_group_homing()     { return false;  }