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1 /*
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2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Win32_OS defines the interface to windows operating systems
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26
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27 class win32 {
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28
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29 protected:
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30 static int _vm_page_size;
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31 static int _vm_allocation_granularity;
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32 static int _processor_type;
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33 static int _processor_level;
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34 static julong _physical_memory;
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35 static size_t _default_stack_size;
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36 static bool _is_nt;
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37
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38 public:
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39 // Windows-specific interface:
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40 static void initialize_system_info();
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41 static void setmode_streams();
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42
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43 // Processor info as provided by NT
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44 static int processor_type() { return _processor_type; }
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45 // Processor level may not be accurate on non-NT systems
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46 static int processor_level() {
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47 assert(is_nt(), "use vm_version instead");
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48 return _processor_level;
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49 }
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50 static julong available_memory();
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51 static julong physical_memory() { return _physical_memory; }
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52
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53 public:
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54 // Generic interface:
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55
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56 // Trace number of created threads
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57 static intx _os_thread_limit;
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58 static volatile intx _os_thread_count;
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59
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60 // Tells whether the platform is NT or Windown95
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61 static bool is_nt() { return _is_nt; }
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62
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63 // Returns the byte size of a virtual memory page
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64 static int vm_page_size() { return _vm_page_size; }
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65
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66 // Returns the size in bytes of memory blocks which can be allocated.
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67 static int vm_allocation_granularity() { return _vm_allocation_granularity; }
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68
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69 // Read the headers for the executable that started the current process into
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70 // the structure passed in (see winnt.h).
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71 static void read_executable_headers(PIMAGE_NT_HEADERS);
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72
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73 // Default stack size for the current process.
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74 static size_t default_stack_size() { return _default_stack_size; }
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75
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76 #ifndef _WIN64
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77 // A wrapper to install a structured exception handler for fast JNI accesors.
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78 static address fast_jni_accessor_wrapper(BasicType);
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79 #endif
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80
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81 // filter function to ignore faults on serializations page
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82 static LONG WINAPI serialize_fault_filter(struct _EXCEPTION_POINTERS* e);
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83 };
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84
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85 class PlatformEvent : public CHeapObj {
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86 private:
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87 double CachePad [4] ; // increase odds that _Event is sole occupant of cache line
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88 volatile int _Event ;
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89 HANDLE _ParkHandle ;
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90
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91 public: // TODO-FIXME: make dtor private
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92 ~PlatformEvent() { guarantee (0, "invariant") ; }
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93
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94 public:
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95 PlatformEvent() {
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96 _Event = 0 ;
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97 _ParkHandle = CreateEvent (NULL, false, false, NULL) ;
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98 guarantee (_ParkHandle != NULL, "invariant") ;
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99 }
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100
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101 // Exercise caution using reset() and fired() - they may require MEMBARs
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102 void reset() { _Event = 0 ; }
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103 int fired() { return _Event; }
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104 void park () ;
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105 void unpark () ;
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106 int park (jlong millis) ;
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107 } ;
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108
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109
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110
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111 class PlatformParker : public CHeapObj {
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112 protected:
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113 HANDLE _ParkEvent ;
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114
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115 public:
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116 ~PlatformParker () { guarantee (0, "invariant") ; }
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117 PlatformParker () {
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118 _ParkEvent = CreateEvent (NULL, true, false, NULL) ;
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119 guarantee (_ParkEvent != NULL, "invariant") ;
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120 }
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121
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122 } ;
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