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1 /*
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2 * Copyright 1997-2007 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 // os defines the interface to operating system; this includes traditional
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26 // OS services (time, I/O) as well as other functionality with system-
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27 // dependent code.
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28
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29 typedef void (*dll_func)(...);
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30
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31 class Thread;
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32 class JavaThread;
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33 class Event;
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34 class DLL;
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35 class FileHandle;
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36
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37 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
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38
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39 // Platform-independent error return values from OS functions
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40 enum OSReturn {
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41 OS_OK = 0, // Operation was successful
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42 OS_ERR = -1, // Operation failed
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43 OS_INTRPT = -2, // Operation was interrupted
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44 OS_TIMEOUT = -3, // Operation timed out
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45 OS_NOMEM = -5, // Operation failed for lack of memory
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46 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
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47 };
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48
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49 enum ThreadPriority { // JLS 20.20.1-3
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50 NoPriority = -1, // Initial non-priority value
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51 MinPriority = 1, // Minimum priority
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52 NormPriority = 5, // Normal (non-daemon) priority
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53 NearMaxPriority = 9, // High priority, used for VMThread
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54 MaxPriority = 10 // Highest priority, used for WatcherThread
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55 // ensures that VMThread doesn't starve profiler
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56 };
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57
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58 // Typedef for structured exception handling support
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59 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
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60
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61 class os: AllStatic {
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62 private:
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63 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
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64
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65 static OSThread* _starting_thread;
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66 static address _polling_page;
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67 static volatile int32_t * _mem_serialize_page;
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68 static uintptr_t _serialize_page_mask;
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69 static volatile jlong _global_time;
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70 static volatile int _global_time_lock;
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71 static bool _use_global_time;
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72 static size_t _page_sizes[page_sizes_max];
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73
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74 static void init_page_sizes(size_t default_page_size) {
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75 _page_sizes[0] = default_page_size;
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76 _page_sizes[1] = 0; // sentinel
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77 }
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78
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79 public:
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80
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81 static void init(void); // Called before command line parsing
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82 static jint init_2(void); // Called after command line parsing
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83
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84 // File names are case-insensitive on windows only
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85 // Override me as needed
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86 static int file_name_strcmp(const char* s1, const char* s2);
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87
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88 static bool getenv(const char* name, char* buffer, int len);
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89 static bool have_special_privileges();
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90
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91 static jlong timeofday();
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92 static void enable_global_time() { _use_global_time = true; }
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93 static void disable_global_time() { _use_global_time = false; }
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94 static jlong read_global_time();
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95 static void update_global_time();
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96 static jlong javaTimeMillis();
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97 static jlong javaTimeNanos();
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98 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
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99 static void run_periodic_checks();
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100
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101
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102 // Returns the elapsed time in seconds since the vm started.
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103 static double elapsedTime();
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104
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105 // Returns real time in seconds since an arbitrary point
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106 // in the past.
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107 static bool getTimesSecs(double* process_real_time,
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108 double* process_user_time,
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109 double* process_system_time);
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110
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111 // Interface to the performance counter
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112 static jlong elapsed_counter();
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113 static jlong elapsed_frequency();
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114
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115 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
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116 // It is MT safe, but not async-safe, as reading time zone
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117 // information may require a lock on some platforms.
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118 static char* local_time_string(char *buf, size_t buflen);
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119 // Fill in buffer with current local time as an ISO-8601 string.
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120 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
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121 // Returns buffer, or NULL if it failed.
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122 static char* iso8601_time(char* buffer, size_t buffer_length);
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123
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124 // Interface for detecting multiprocessor system
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125 static inline bool is_MP() {
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126 assert(_processor_count > 0, "invalid processor count");
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127 return _processor_count > 1;
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128 }
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129 static julong available_memory();
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130 static julong physical_memory();
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131 static julong allocatable_physical_memory(julong size);
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132 static bool is_server_class_machine();
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133
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134 // number of CPUs
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135 static int processor_count() {
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136 return _processor_count;
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137 }
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138
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139 // Returns the number of CPUs this process is currently allowed to run on.
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140 // Note that on some OSes this can change dynamically.
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141 static int active_processor_count();
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142
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143 // Bind processes to processors.
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144 // This is a two step procedure:
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145 // first you generate a distribution of processes to processors,
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146 // then you bind processes according to that distribution.
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147 // Compute a distribution for number of processes to processors.
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148 // Stores the processor id's into the distribution array argument.
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149 // Returns true if it worked, false if it didn't.
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150 static bool distribute_processes(uint length, uint* distribution);
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151 // Binds the current process to a processor.
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152 // Returns true if it worked, false if it didn't.
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153 static bool bind_to_processor(uint processor_id);
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154
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155 // Interface for stack banging (predetect possible stack overflow for
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156 // exception processing) There are guard pages, and above that shadow
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157 // pages for stack overflow checking.
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158 static bool uses_stack_guard_pages();
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159 static bool allocate_stack_guard_pages();
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160 static void bang_stack_shadow_pages();
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161 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
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162
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163 // OS interface to Virtual Memory
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164
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165 // Return the default page size.
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166 static int vm_page_size();
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167
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168 // Return the page size to use for a region of memory. The min_pages argument
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169 // is a hint intended to limit fragmentation; it says the returned page size
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170 // should be <= region_max_size / min_pages. Because min_pages is a hint,
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171 // this routine may return a size larger than region_max_size / min_pages.
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172 //
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173 // The current implementation ignores min_pages if a larger page size is an
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174 // exact multiple of both region_min_size and region_max_size. This allows
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175 // larger pages to be used when doing so would not cause fragmentation; in
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176 // particular, a single page can be used when region_min_size ==
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177 // region_max_size == a supported page size.
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178 static size_t page_size_for_region(size_t region_min_size,
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179 size_t region_max_size,
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180 uint min_pages);
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181
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182 // Method for tracing page sizes returned by the above method; enabled by
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183 // TracePageSizes. The region_{min,max}_size parameters should be the values
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184 // passed to page_size_for_region() and page_size should be the result of that
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185 // call. The (optional) base and size parameters should come from the
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186 // ReservedSpace base() and size() methods.
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187 static void trace_page_sizes(const char* str, const size_t region_min_size,
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188 const size_t region_max_size,
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189 const size_t page_size,
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190 const char* base = NULL,
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191 const size_t size = 0) PRODUCT_RETURN;
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192
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193 static int vm_allocation_granularity();
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194 static char* reserve_memory(size_t bytes, char* addr = 0,
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195 size_t alignment_hint = 0);
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196 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
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197 static void split_reserved_memory(char *base, size_t size,
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198 size_t split, bool realloc);
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199 static bool commit_memory(char* addr, size_t bytes);
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200 static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
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201 static bool uncommit_memory(char* addr, size_t bytes);
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202 static bool release_memory(char* addr, size_t bytes);
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203 static bool protect_memory(char* addr, size_t bytes);
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204 static bool guard_memory(char* addr, size_t bytes);
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205 static bool unguard_memory(char* addr, size_t bytes);
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206 static char* map_memory(int fd, const char* file_name, size_t file_offset,
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207 char *addr, size_t bytes, bool read_only = false,
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208 bool allow_exec = false);
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209 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
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210 char *addr, size_t bytes, bool read_only,
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211 bool allow_exec);
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212 static bool unmap_memory(char *addr, size_t bytes);
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213 static void free_memory(char *addr, size_t bytes);
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214 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
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215
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216 // NUMA-specific interface
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217 static void numa_make_local(char *addr, size_t bytes);
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218 static void numa_make_global(char *addr, size_t bytes);
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219 static size_t numa_get_groups_num();
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220 static size_t numa_get_leaf_groups(int *ids, size_t size);
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221 static bool numa_topology_changed();
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222 static int numa_get_group_id();
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223
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224 // Page manipulation
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225 struct page_info {
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226 size_t size;
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227 int lgrp_id;
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228 };
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229 static bool get_page_info(char *start, page_info* info);
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230 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
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231
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232 static char* non_memory_address_word();
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233 // reserve, commit and pin the entire memory region
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234 static char* reserve_memory_special(size_t size);
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235 static bool release_memory_special(char* addr, size_t bytes);
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236 static bool large_page_init();
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237 static size_t large_page_size();
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238 static bool can_commit_large_page_memory();
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239
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240 // OS interface to polling page
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241 static address get_polling_page() { return _polling_page; }
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242 static void set_polling_page(address page) { _polling_page = page; }
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243 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
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244 static void make_polling_page_unreadable();
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245 static void make_polling_page_readable();
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246
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247 // Routines used to serialize the thread state without using membars
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248 static void serialize_thread_states();
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249
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250 // Since we write to the serialize page from every thread, we
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251 // want stores to be on unique cache lines whenever possible
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252 // in order to minimize CPU cross talk. We pre-compute the
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253 // amount to shift the thread* to make this offset unique to
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254 // each thread.
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255 static int get_serialize_page_shift_count() {
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256 return SerializePageShiftCount;
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257 }
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258
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259 static void set_serialize_page_mask(uintptr_t mask) {
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260 _serialize_page_mask = mask;
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261 }
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262
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263 static unsigned int get_serialize_page_mask() {
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264 return _serialize_page_mask;
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265 }
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266
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267 static void set_memory_serialize_page(address page);
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268
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269 static address get_memory_serialize_page() {
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270 return (address)_mem_serialize_page;
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271 }
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272
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273 static inline void write_memory_serialize_page(JavaThread *thread) {
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274 uintptr_t page_offset = ((uintptr_t)thread >>
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275 get_serialize_page_shift_count()) &
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276 get_serialize_page_mask();
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277 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
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278 }
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279
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280 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
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281 address thr_addr;
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282 if (UseMembar) return false;
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283 // Calculate thread specific address
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284 if (thread == NULL) return false;
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285 // TODO-FIXME: some platforms mask off faulting addresses to the base pagesize.
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286 // Instead of using a test for equality we should probably use something
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287 // of the form:
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288 // return ((_mem_serialize_page ^ addr) & -pagesize) == 0
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289 //
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290 thr_addr = (address)(((uintptr_t)thread >>
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291 get_serialize_page_shift_count()) &
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292 get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page;
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293 return (thr_addr == addr);
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294 }
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295
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296 static void block_on_serialize_page_trap();
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297
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298 // threads
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299
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300 enum ThreadType {
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301 vm_thread,
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302 cgc_thread, // Concurrent GC thread
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303 pgc_thread, // Parallel GC thread
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304 java_thread,
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305 compiler_thread,
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306 watcher_thread
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307 };
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308
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309 static bool create_thread(Thread* thread,
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310 ThreadType thr_type,
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311 size_t stack_size = 0);
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312 static bool create_main_thread(JavaThread* thread);
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313 static bool create_attached_thread(JavaThread* thread);
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314 static void pd_start_thread(Thread* thread);
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315 static void start_thread(Thread* thread);
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316
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317 static void initialize_thread();
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318 static void free_thread(OSThread* osthread);
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319
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320 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
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321 static intx current_thread_id();
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322 static int current_process_id();
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323 // hpi::read for calls from non native state
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324 // For performance, hpi::read is only callable from _thread_in_native
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325 static size_t read(int fd, void *buf, unsigned int nBytes);
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326 static int sleep(Thread* thread, jlong ms, bool interruptable);
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327 static int naked_sleep();
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328 static void infinite_sleep(); // never returns, use with CAUTION
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329 static void yield(); // Yields to all threads with same priority
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330 enum YieldResult {
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331 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
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332 YIELD_NONEREADY = 0, // No other runnable/ready threads.
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333 // platform-specific yield return immediately
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334 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
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335 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
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336 // yield that can be used in lieu of blocking.
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337 } ;
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338 static YieldResult NakedYield () ;
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339 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
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340 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
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341 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
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342 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
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343
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344 static void interrupt(Thread* thread);
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345 static bool is_interrupted(Thread* thread, bool clear_interrupted);
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346
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347 static int pd_self_suspend_thread(Thread* thread);
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348
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349 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
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350 static frame fetch_frame_from_context(void* ucVoid);
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351
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352 static ExtendedPC get_thread_pc(Thread *thread);
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353 static void breakpoint();
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354
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355 static address current_stack_pointer();
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356 static address current_stack_base();
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357 static size_t current_stack_size();
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358
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359 static int message_box(const char* title, const char* message);
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360 static char* do_you_want_to_debug(const char* message);
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361
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362 // run cmd in a separate process and return its exit code; or -1 on failures
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363 static int fork_and_exec(char *cmd);
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364
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365 // Set file to send error reports.
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366 static void set_error_file(const char *logfile);
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367
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368 // os::exit() is merged with vm_exit()
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369 // static void exit(int num);
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370
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371 // Terminate the VM, but don't exit the process
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372 static void shutdown();
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373
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374 // Terminate with an error. Default is to generate a core file on platforms
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375 // that support such things. This calls shutdown() and then aborts.
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376 static void abort(bool dump_core = true);
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377
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378 // Die immediately, no exit hook, no abort hook, no cleanup.
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379 static void die();
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380
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381 // Reading directories.
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382 static DIR* opendir(const char* dirname);
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383 static int readdir_buf_size(const char *path);
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384 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
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385 static int closedir(DIR* dirp);
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386
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387 // Dynamic library extension
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388 static const char* dll_file_extension();
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389
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390 static const char* get_temp_directory();
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391 static const char* get_current_directory(char *buf, int buflen);
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392
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393 // Symbol lookup, find nearest function name; basically it implements
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394 // dladdr() for all platforms. Name of the nearest function is copied
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395 // to buf. Distance from its base address is returned as offset.
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396 // If function name is not found, buf[0] is set to '\0' and offset is
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397 // set to -1.
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398 static bool dll_address_to_function_name(address addr, char* buf,
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399 int buflen, int* offset);
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400
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401 // Locate DLL/DSO. On success, full path of the library is copied to
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402 // buf, and offset is set to be the distance between addr and the
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403 // library's base address. On failure, buf[0] is set to '\0' and
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404 // offset is set to -1.
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405 static bool dll_address_to_library_name(address addr, char* buf,
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406 int buflen, int* offset);
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407
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408 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
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409 static bool address_is_in_vm(address addr);
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410
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411 // Loads .dll/.so and
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412 // in case of error it checks if .dll/.so was built for the
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413 // same architecture as Hotspot is running on
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414 static void* dll_load(const char *name, char *ebuf, int ebuflen);
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415
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416 // Print out system information; they are called by fatal error handler.
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417 // Output format may be different on different platforms.
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418 static void print_os_info(outputStream* st);
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419 static void print_cpu_info(outputStream* st);
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420 static void print_memory_info(outputStream* st);
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421 static void print_dll_info(outputStream* st);
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422 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
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423 static void print_context(outputStream* st, void* context);
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424 static void print_siginfo(outputStream* st, void* siginfo);
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425 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
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426 static void print_date_and_time(outputStream* st);
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427
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428 // The following two functions are used by fatal error handler to trace
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429 // native (C) frames. They are not part of frame.hpp/frame.cpp because
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430 // frame.hpp/cpp assume thread is JavaThread, and also because different
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431 // OS/compiler may have different convention or provide different API to
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432 // walk C frames.
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433 //
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434 // We don't attempt to become a debugger, so we only follow frames if that
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435 // does not require a lookup in the unwind table, which is part of the binary
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436 // file but may be unsafe to read after a fatal error. So on x86, we can
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437 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
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438 // possible to walk C stack without having the unwind table.
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439 static bool is_first_C_frame(frame *fr);
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440 static frame get_sender_for_C_frame(frame *fr);
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441
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442 // return current frame. pc() and sp() are set to NULL on failure.
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443 static frame current_frame();
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444
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445 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
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446
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447 // returns a string to describe the exception/signal;
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448 // returns NULL if exception_code is not an OS exception/signal.
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449 static const char* exception_name(int exception_code, char* buf, size_t buflen);
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450
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451 // Returns native Java library, loads if necessary
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452 static void* native_java_library();
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453
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454 // Fills in path to jvm.dll/libjvm.so (this info used to find hpi).
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455 static void jvm_path(char *buf, jint buflen);
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456
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457 // JNI names
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458 static void print_jni_name_prefix_on(outputStream* st, int args_size);
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459 static void print_jni_name_suffix_on(outputStream* st, int args_size);
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460
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461 // File conventions
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462 static const char* file_separator();
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463 static const char* line_separator();
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464 static const char* path_separator();
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465
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466 // Init os specific system properties values
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467 static void init_system_properties_values();
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468
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469 // IO operations, non-JVM_ version.
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470 static int stat(const char* path, struct stat* sbuf);
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471 static bool dir_is_empty(const char* path);
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472
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473 // IO operations on binary files
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474 static int create_binary_file(const char* path, bool rewrite_existing);
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475 static jlong current_file_offset(int fd);
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476 static jlong seek_to_file_offset(int fd, jlong offset);
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477
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478 // Thread Local Storage
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479 static int allocate_thread_local_storage();
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480 static void thread_local_storage_at_put(int index, void* value);
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481 static void* thread_local_storage_at(int index);
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482 static void free_thread_local_storage(int index);
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483
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484 // General allocation (must be MT-safe)
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485 static void* malloc (size_t size);
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486 static void* realloc (void *memblock, size_t size);
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487 static void free (void *memblock);
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488 static bool check_heap(bool force = false); // verify C heap integrity
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489 static char* strdup(const char *); // Like strdup
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490
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491 #ifndef PRODUCT
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492 static int num_mallocs; // # of calls to malloc/realloc
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493 static size_t alloc_bytes; // # of bytes allocated
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494 static int num_frees; // # of calls to free
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495 #endif
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496
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497 // Printing 64 bit integers
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498 static const char* jlong_format_specifier();
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499 static const char* julong_format_specifier();
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500
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501 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
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502 static void signal_init();
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503 static void signal_init_pd();
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504 static void signal_notify(int signal_number);
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505 static void* signal(int signal_number, void* handler);
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506 static void signal_raise(int signal_number);
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507 static int signal_wait();
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508 static int signal_lookup();
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509 static void* user_handler();
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510 static void terminate_signal_thread();
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511 static int sigexitnum_pd();
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512
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513 // random number generation
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514 static long random(); // return 32bit pseudorandom number
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515 static void init_random(long initval); // initialize random sequence
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516
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517 // Structured OS Exception support
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518 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
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519
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520 // JVMTI & JVM monitoring and management support
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521 // The thread_cpu_time() and current_thread_cpu_time() are only
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522 // supported if is_thread_cpu_time_supported() returns true.
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523 // They are not supported on Solaris T1.
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524
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525 // Thread CPU Time - return the fast estimate on a platform
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526 // On Solaris - call gethrvtime (fast) - user time only
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527 // On Linux - fast clock_gettime where available - user+sys
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528 // - otherwise: very slow /proc fs - user+sys
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529 // On Windows - GetThreadTimes - user+sys
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530 static jlong current_thread_cpu_time();
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531 static jlong thread_cpu_time(Thread* t);
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532
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533 // Thread CPU Time with user_sys_cpu_time parameter.
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534 //
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535 // If user_sys_cpu_time is true, user+sys time is returned.
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536 // Otherwise, only user time is returned
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537 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
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538 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
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539
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540 // Return a bunch of info about the timers.
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541 // Note that the returned info for these two functions may be different
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542 // on some platforms
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543 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
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544 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
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545
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546 static bool is_thread_cpu_time_supported();
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547
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548 // System loadavg support. Returns -1 if load average cannot be obtained.
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549 static int loadavg(double loadavg[], int nelem);
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550
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551 // Hook for os specific jvm options that we don't want to abort on seeing
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552 static bool obsolete_option(const JavaVMOption *option);
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553
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554 // Platform dependent stuff
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555 #include "incls/_os_pd.hpp.incl"
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556
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557 // debugging support (mostly used by debug.cpp)
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558 static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address
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559
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560 static bool dont_yield(); // when true, JVM_Yield() is nop
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561 static void print_statistics();
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562
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563 // Thread priority helpers (implemented in OS-specific part)
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564 static OSReturn set_native_priority(Thread* thread, int native_prio);
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565 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
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|
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566 static int java_to_os_priority[MaxPriority + 1];
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567 // Hint to the underlying OS that a task switch would not be good.
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568 // Void return because it's a hint and can fail.
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|
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569 static void hint_no_preempt();
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570
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571 // Used at creation if requested by the diagnostic flag PauseAtStartup.
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|
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572 // Causes the VM to wait until an external stimulus has been applied
|
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573 // (for Unix, that stimulus is a signal, for Windows, an external
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574 // ResumeThread call)
|
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|
575 static void pause();
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576
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577 protected:
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578 static long _rand_seed; // seed for random number generator
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|
|
579 static int _processor_count; // number of processors
|
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580
|
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581 static char* format_boot_path(const char* format_string,
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|
582 const char* home,
|
|
|
583 int home_len,
|
|
|
584 char fileSep,
|
|
|
585 char pathSep);
|
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|
586 static bool set_boot_path(char fileSep, char pathSep);
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587 };
|
|
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588
|
|
|
589 // Note that "PAUSE" is almost always used with synchronization
|
|
|
590 // so arguably we should provide Atomic::SpinPause() instead
|
|
|
591 // of the global SpinPause() with C linkage.
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|
|
592 // It'd also be eligible for inlining on many platforms.
|
|
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593
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594 extern "C" int SpinPause () ;
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|
595 extern "C" int SafeFetch32 (int * adr, int errValue) ;
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|
|
596 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;
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