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_HPP
26 #define OS_WINDOWS_OS_WINDOWS_HPP
27 // Win32_OS defines the interface to windows operating systems
28
29 // strtok_s is the Windows thread-safe equivalent of POSIX strtok_r
30 #define strtok_r strtok_s
31
32 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
33 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
34
35 // Information about the protection of the page at address '0' on this os.
36 static bool zero_page_read_protected() { return true; }
37
38 // File conventions
39 static const char* file_separator() { return "\\"; }
40 static const char* line_separator() { return "\r\n"; }
41 static const char* path_separator() { return ";"; }
42
43 class win32 {
44 friend class os;
45 friend unsigned __stdcall thread_native_entry(class Thread*);
46
47 protected:
48 static int _vm_page_size;
49 static int _vm_allocation_granularity;
50 static int _processor_type;
51 static int _processor_level;
52 static julong _physical_memory;
53 static size_t _default_stack_size;
54 static bool _is_windows_server;
55 static bool _has_exit_bug;
56
57 static void print_windows_version(outputStream* st);
58 static void print_uptime_info(outputStream* st);
59
60 public:
61 // Windows-specific interface:
62 static void initialize_system_info();
63 static void setmode_streams();
64
65 // Processor info as provided by NT
66 static int processor_type() { return _processor_type; }
67 static int processor_level() {
68 return _processor_level;
69 }
70 static julong available_memory();
71 static julong physical_memory() { return _physical_memory; }
72
73 // load dll from Windows system directory or Windows directory
74 static HINSTANCE load_Windows_dll(const char* name, char *ebuf, int ebuflen);
75
76 private:
77 enum Ept { EPT_THREAD, EPT_PROCESS, EPT_PROCESS_DIE };
78 // Wrapper around _endthreadex(), exit() and _exit()
79 static int exit_process_or_thread(Ept what, int exit_code);
80
81 static void initialize_performance_counter();
82
83 public:
84 // Generic interface:
85
86 // Trace number of created threads
87 static intx _os_thread_limit;
88 static volatile intx _os_thread_count;
89
90 // Tells whether this is a server version of Windows
91 static bool is_windows_server() { return _is_windows_server; }
92
93 // Tells whether there can be the race bug during process exit on this platform
94 static bool has_exit_bug() { return _has_exit_bug; }
95
96 // Returns the byte size of a virtual memory page
97 static int vm_page_size() { return _vm_page_size; }
98
99 // Returns the size in bytes of memory blocks which can be allocated.
100 static int vm_allocation_granularity() { return _vm_allocation_granularity; }
101
102 // Read the headers for the executable that started the current process into
103 // the structure passed in (see winnt.h).
104 static void read_executable_headers(PIMAGE_NT_HEADERS);
105
106 // Default stack size for the current process.
107 static size_t default_stack_size() { return _default_stack_size; }
108
109 static bool get_frame_at_stack_banging_point(JavaThread* thread,
110 struct _EXCEPTION_POINTERS* exceptionInfo,
111 address pc, frame* fr);
112
113 #ifndef _WIN64
114 // A wrapper to install a structured exception handler for fast JNI accesors.
115 static address fast_jni_accessor_wrapper(BasicType);
116 #endif
117
118 // Fast access to current thread
119 protected:
120 static int _thread_ptr_offset;
121 private:
122 static void initialize_thread_ptr_offset();
123 public:
124 static inline void set_thread_ptr_offset(int offset) {
125 _thread_ptr_offset = offset;
126 }
127 static inline int get_thread_ptr_offset() { return _thread_ptr_offset; }
128 };
129
130 /*
131 * Crash protection for the watcher thread. Wrap the callback
132 * with a __try { call() }
133 * To be able to use this - don't take locks, don't rely on destructors,
134 * don't make OS library calls, don't allocate memory, don't print,
135 * don't call code that could leave the heap / memory in an inconsistent state,
136 * or anything else where we are not in control if we suddenly jump out.
137 */
138 class ThreadCrashProtection : public StackObj {
139 public:
140 static bool is_crash_protected(Thread* thr) {
141 return _crash_protection != NULL && _protected_thread == thr;
142 }
143
144 ThreadCrashProtection();
145 bool call(os::CrashProtectionCallback& cb);
146 private:
147 static Thread* _protected_thread;
148 static ThreadCrashProtection* _crash_protection;
149 static volatile intptr_t _crash_mux;
150 };
151
152 class PlatformEvent : public CHeapObj<mtSynchronizer> {
153 private:
154 double CachePad [4] ; // increase odds that _Event is sole occupant of cache line
155 volatile int _Event ;
156 HANDLE _ParkHandle ;
157
158 public: // TODO-FIXME: make dtor private
159 ~PlatformEvent() { guarantee (0, "invariant") ; }
160
161 public:
162 PlatformEvent() {
163 _Event = 0 ;
164 _ParkHandle = CreateEvent (NULL, false, false, NULL) ;
165 guarantee (_ParkHandle != NULL, "invariant") ;
166 }
167
168 // Exercise caution using reset() and fired() - they may require MEMBARs
169 void reset() { _Event = 0 ; }
170 int fired() { return _Event; }
171 void park () ;
172 void unpark () ;
173 int park (jlong millis) ;
174 } ;
175
176
177
178 class PlatformParker : public CHeapObj<mtSynchronizer> {
179 protected:
180 HANDLE _ParkEvent ;
181
182 public:
183 ~PlatformParker () { guarantee (0, "invariant") ; }
184 PlatformParker () {
185 _ParkEvent = CreateEvent (NULL, true, false, NULL) ;
186 guarantee (_ParkEvent != NULL, "invariant") ;
187 }
188
189 } ;
190
191 // Platform specific implementations that underpin VM Mutex/Monitor classes
192
193 class PlatformMutex : public CHeapObj<mtSynchronizer> {
194 NONCOPYABLE(PlatformMutex);
195
196 protected:
197 CRITICAL_SECTION _mutex; // Native mutex for locking
198
199 public:
200 PlatformMutex();
201 ~PlatformMutex();
202 void lock();
203 void unlock();
204 bool try_lock();
205 };
206
207 class PlatformMonitor : public PlatformMutex {
208 private:
209 CONDITION_VARIABLE _cond; // Native condition variable for blocking
210 NONCOPYABLE(PlatformMonitor);
211
212 public:
213 PlatformMonitor();
214 ~PlatformMonitor();
215 int wait(jlong millis);
216 void notify();
217 void notify_all();
218 };
219
220 #endif // OS_WINDOWS_OS_WINDOWS_HPP