1 /*
   2  * Copyright (c) 1997, 2019, 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_OS_WINDOWS_INLINE_HPP
  26 #define OS_WINDOWS_OS_WINDOWS_INLINE_HPP
  27 
  28 #include "runtime/os.hpp"
  29 #include "runtime/thread.hpp"
  30 
  31 inline const char* os::dll_file_extension()            { return ".dll"; }
  32 
  33 inline const int os::default_file_open_flags() { return O_BINARY | O_NOINHERIT;}
  34 
  35 // File names are case-insensitive on windows only
  36 inline int os::file_name_strncmp(const char* s, const char* t, size_t num) {
  37   return _strnicmp(s, t, num);
  38 }
  39 
  40 inline void  os::dll_unload(void *lib) {
  41   ::FreeLibrary((HMODULE)lib);
  42 }
  43 
  44 inline void* os::dll_lookup(void *lib, const char *name) {
  45   return (void*)::GetProcAddress((HMODULE)lib, name);
  46 }
  47 
  48 inline bool os::uses_stack_guard_pages() {
  49   return true;
  50 }
  51 
  52 inline bool os::must_commit_stack_guard_pages() {
  53   return true;
  54 }
  55 
  56 // Bang the shadow pages if they need to be touched to be mapped.
  57 inline void os::map_stack_shadow_pages(address sp) {
  58   // Write to each page of our new frame to force OS mapping.
  59   // If we decrement stack pointer more than one page
  60   // the OS may not map an intervening page into our space
  61   // and may fault on a memory access to interior of our frame.
  62   const int page_size = os::win32::vm_page_size();
  63   const size_t n_pages = JavaThread::stack_shadow_zone_size() / page_size;
  64   for (size_t pages = 1; pages <= n_pages; pages++) {
  65     sp -= page_size;
  66     *sp = 0;
  67   }
  68 }
  69 
  70 inline bool os::numa_has_static_binding()   { return true;   }
  71 inline bool os::numa_has_group_homing()     { return false;  }
  72 
  73 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
  74   return ::write(fd, buf, nBytes);
  75 }
  76 
  77 inline int os::close(int fd) {
  78   return ::close(fd);
  79 }
  80 
  81 inline bool os::supports_monotonic_clock() {
  82   return true;
  83 }
  84 
  85 inline void os::exit(int num) {
  86   win32::exit_process_or_thread(win32::EPT_PROCESS, num);
  87 }
  88 
  89 // Platform Monitor implementation
  90 
  91 inline os::PlatformMonitor::PlatformMonitor() {
  92   InitializeConditionVariable(&_cond);
  93   InitializeCriticalSection(&_mutex);
  94 }
  95 
  96 inline os::PlatformMonitor::~PlatformMonitor() {
  97   DeleteCriticalSection(&_mutex);
  98 }
  99 
 100 inline void os::PlatformMonitor::lock() {
 101   EnterCriticalSection(&_mutex);
 102 }
 103 
 104 inline void os::PlatformMonitor::unlock() {
 105   LeaveCriticalSection(&_mutex);
 106 }
 107 
 108 inline bool os::PlatformMonitor::try_lock() {
 109   return TryEnterCriticalSection(&_mutex);
 110 }
 111 
 112 inline void os::PlatformMonitor::notify() {
 113   WakeConditionVariable(&_cond);
 114 }
 115 
 116 inline void os::PlatformMonitor::notify_all() {
 117   WakeAllConditionVariable(&_cond);
 118 }
 119 
 120 #endif // OS_WINDOWS_OS_WINDOWS_INLINE_HPP