xref: /openjdk9/hotspot/src/os/linux/vm/os_linux.inline.hpp

/*
 * Copyright 1999-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

inline void* os::thread_local_storage_at(int index) {
  return pthread_getspecific((pthread_key_t)index);
}

inline const char* os::file_separator() {
  return "/";
}

inline const char* os::line_separator() {
  return "\n";
}

inline const char* os::path_separator() {
  return ":";
}

inline const char* os::jlong_format_specifier() {
  return "%lld";
}

inline const char* os::julong_format_specifier() {
  return "%llu";
}

// File names are case-sensitive on windows only
inline int os::file_name_strcmp(const char* s1, const char* s2) {
  return strcmp(s1, s2);
}

inline bool os::obsolete_option(const JavaVMOption *option) {
  return false;
}

inline bool os::uses_stack_guard_pages() {
  return true;
}

inline bool os::allocate_stack_guard_pages() {
  assert(uses_stack_guard_pages(), "sanity check");
  return true;
}


// On Linux, reservations are made on a page by page basis, nothing to do.
inline void os::split_reserved_memory(char *base, size_t size,
                                      size_t split, bool realloc) {
}


// Bang the shadow pages if they need to be touched to be mapped.
inline void os::bang_stack_shadow_pages() {
}

inline DIR* os::opendir(const char* dirname)
{
  assert(dirname != NULL, "just checking");
  return ::opendir(dirname);
}

inline int os::readdir_buf_size(const char *path)
{
  return NAME_MAX + sizeof(dirent) + 1;
}

inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
{
  dirent* p;
  int status;
  assert(dirp != NULL, "just checking");

  // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
  // version. Here is the doc for this function:
  // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html

  if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
    errno = status;
    return NULL;
  } else
    return p;
}

inline int os::closedir(DIR *dirp)
{
  assert(dirp != NULL, "just checking");
  return ::closedir(dirp);
}

// macros for restartable system calls

#define RESTARTABLE(_cmd, _result) do { \
    _result = _cmd; \
  } while(((int)_result == OS_ERR) && (errno == EINTR))

#define RESTARTABLE_RETURN_INT(_cmd) do { \
  int _result; \
  RESTARTABLE(_cmd, _result); \
  return _result; \
} while(false)