1 /* 2 * Copyright (c) 1997, 2017, 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/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_strcmp(const char* s, const char* t) { 37 return _stricmp(s, t); 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::obsolete_option(const JavaVMOption *option) { 49 return false; 50 } 51 52 inline bool os::uses_stack_guard_pages() { 53 return true; 54 } 55 56 inline bool os::must_commit_stack_guard_pages() { 57 return true; 58 } 59 60 inline int os::readdir_buf_size(const char *path) 61 { 62 /* As Windows doesn't use the directory entry buffer passed to 63 os::readdir() this can be as short as possible */ 64 65 return 1; 66 } 67 68 // Bang the shadow pages if they need to be touched to be mapped. 69 inline void os::map_stack_shadow_pages(address sp) { 70 // Write to each page of our new frame to force OS mapping. 71 // If we decrement stack pointer more than one page 72 // the OS may not map an intervening page into our space 73 // and may fault on a memory access to interior of our frame. 74 const int page_size = os::win32::vm_page_size(); 75 const size_t n_pages = JavaThread::stack_shadow_zone_size() / page_size; 76 for (size_t pages = 1; pages <= n_pages; pages++) { 77 sp -= page_size; 78 *sp = 0; 79 } 80 } 81 82 inline bool os::numa_has_static_binding() { return true; } 83 inline bool os::numa_has_group_homing() { return false; } 84 85 inline ssize_t os::read(int fd, void *buf, unsigned int nBytes) { 86 return ::read(fd, buf, nBytes); 87 } 88 89 inline ssize_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 90 return ::read(fd, buf, nBytes); 91 } 92 93 inline ssize_t os::write(int fd, const void *buf, unsigned int nBytes) { 94 return ::write(fd, buf, nBytes); 95 } 96 97 inline int os::close(int fd) { 98 return ::close(fd); 99 } 100 101 inline bool os::supports_monotonic_clock() { 102 return true; 103 } 104 105 inline void os::exit(int num) { 106 win32::exit_process_or_thread(win32::EPT_PROCESS, num); 107 } 108 109 #endif // OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP