1 /* 2 * Copyright (c) 1997, 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 // Win32_OS defines the interface to windows operating systems 26 27 class win32 { 28 29 protected: 30 static int _vm_page_size; 31 static int _vm_allocation_granularity; 32 static int _processor_type; 33 static int _processor_level; 34 static julong _physical_memory; 35 static size_t _default_stack_size; 36 static bool _is_nt; 37 static bool _is_windows_2003; 38 39 public: 40 // Windows-specific interface: 41 static void initialize_system_info(); 42 static void setmode_streams(); 43 44 // Processor info as provided by NT 45 static int processor_type() { return _processor_type; } 46 // Processor level may not be accurate on non-NT systems 47 static int processor_level() { 48 assert(is_nt(), "use vm_version instead"); 49 return _processor_level; 50 } 51 static julong available_memory(); 52 static julong physical_memory() { return _physical_memory; } 53 54 public: 55 // Generic interface: 56 57 // Trace number of created threads 58 static intx _os_thread_limit; 59 static volatile intx _os_thread_count; 60 61 // Tells whether the platform is NT or Windown95 62 static bool is_nt() { return _is_nt; } 63 64 // Tells whether the platform is Windows 2003 65 static bool is_windows_2003() { return _is_windows_2003; } 66 67 // Returns the byte size of a virtual memory page 68 static int vm_page_size() { return _vm_page_size; } 69 70 // Returns the size in bytes of memory blocks which can be allocated. 71 static int vm_allocation_granularity() { return _vm_allocation_granularity; } 72 73 // Read the headers for the executable that started the current process into 74 // the structure passed in (see winnt.h). 75 static void read_executable_headers(PIMAGE_NT_HEADERS); 76 77 // Default stack size for the current process. 78 static size_t default_stack_size() { return _default_stack_size; } 79 80 #ifndef _WIN64 81 // A wrapper to install a structured exception handler for fast JNI accesors. 82 static address fast_jni_accessor_wrapper(BasicType); 83 #endif 84 85 // filter function to ignore faults on serializations page 86 static LONG WINAPI serialize_fault_filter(struct _EXCEPTION_POINTERS* e); 87 }; 88 89 class PlatformEvent : public CHeapObj { 90 private: 91 double CachePad [4] ; // increase odds that _Event is sole occupant of cache line 92 volatile int _Event ; 93 HANDLE _ParkHandle ; 94 95 public: // TODO-FIXME: make dtor private 96 ~PlatformEvent() { guarantee (0, "invariant") ; } 97 98 public: 99 PlatformEvent() { 100 _Event = 0 ; 101 _ParkHandle = CreateEvent (NULL, false, false, NULL) ; 102 guarantee (_ParkHandle != NULL, "invariant") ; 103 } 104 105 // Exercise caution using reset() and fired() - they may require MEMBARs 106 void reset() { _Event = 0 ; } 107 int fired() { return _Event; } 108 void park () ; 109 void unpark () ; 110 int park (jlong millis) ; 111 } ; 112 113 114 115 class PlatformParker : public CHeapObj { 116 protected: 117 HANDLE _ParkEvent ; 118 119 public: 120 ~PlatformParker () { guarantee (0, "invariant") ; } 121 PlatformParker () { 122 _ParkEvent = CreateEvent (NULL, true, false, NULL) ; 123 guarantee (_ParkEvent != NULL, "invariant") ; 124 } 125 126 } ;