Mercurial > hg > truffle
annotate src/os/posix/vm/os_posix.cpp @ 17740:7cf8559b08d9
Merge
author | kvn |
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date | Thu, 20 Mar 2014 11:23:09 -0700 |
parents | d1621038becf |
children | 8a9bb7821e28 6c9332549827 |
rev | line source |
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2204 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
2204 | 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 #include "prims/jvm.h" | |
6197 | 26 #include "runtime/frame.inline.hpp" |
2204 | 27 #include "runtime/os.hpp" |
28 #include "utilities/vmError.hpp" | |
29 | |
30 #include <unistd.h> | |
31 #include <sys/resource.h> | |
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32 #include <sys/utsname.h> |
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33 #include <pthread.h> |
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34 #include <signal.h> |
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35 |
2204 | 36 |
37 // Check core dump limit and report possible place where core can be found | |
38 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { | |
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39 int n; |
2204 | 40 struct rlimit rlim; |
41 bool success; | |
42 | |
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43 n = get_core_path(buffer, bufferSize); |
2204 | 44 |
45 if (getrlimit(RLIMIT_CORE, &rlim) != 0) { | |
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46 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); |
2204 | 47 success = true; |
48 } else { | |
49 switch(rlim.rlim_cur) { | |
50 case RLIM_INFINITY: | |
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51 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); |
2204 | 52 success = true; |
53 break; | |
54 case 0: | |
55 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); | |
56 success = false; | |
57 break; | |
58 default: | |
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59 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10)); |
2204 | 60 success = true; |
61 break; | |
62 } | |
63 } | |
64 VMError::report_coredump_status(buffer, success); | |
65 } | |
66 | |
6197 | 67 address os::get_caller_pc(int n) { |
68 #ifdef _NMT_NOINLINE_ | |
69 n ++; | |
70 #endif | |
71 frame fr = os::current_frame(); | |
72 while (n > 0 && fr.pc() && | |
73 !os::is_first_C_frame(&fr) && fr.sender_pc()) { | |
74 fr = os::get_sender_for_C_frame(&fr); | |
75 n --; | |
76 } | |
77 if (n == 0) { | |
78 return fr.pc(); | |
79 } else { | |
80 return NULL; | |
81 } | |
82 } | |
83 | |
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84 int os::get_last_error() { |
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85 return errno; |
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86 } |
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87 |
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88 bool os::is_debugger_attached() { |
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89 // not implemented |
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90 return false; |
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91 } |
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92 |
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93 void os::wait_for_keypress_at_exit(void) { |
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94 // don't do anything on posix platforms |
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95 return; |
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96 } |
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97 |
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98 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED, |
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99 // so on posix, unmap the section at the start and at the end of the chunk that we mapped |
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100 // rather than unmapping and remapping the whole chunk to get requested alignment. |
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101 char* os::reserve_memory_aligned(size_t size, size_t alignment) { |
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102 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, |
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103 "Alignment must be a multiple of allocation granularity (page size)"); |
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104 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); |
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105 |
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106 size_t extra_size = size + alignment; |
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107 assert(extra_size >= size, "overflow, size is too large to allow alignment"); |
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108 |
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109 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); |
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110 |
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111 if (extra_base == NULL) { |
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112 return NULL; |
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113 } |
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114 |
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115 // Do manual alignment |
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116 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); |
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117 |
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118 // [ | | ] |
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119 // ^ extra_base |
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120 // ^ extra_base + begin_offset == aligned_base |
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121 // extra_base + begin_offset + size ^ |
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122 // extra_base + extra_size ^ |
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123 // |<>| == begin_offset |
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124 // end_offset == |<>| |
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125 size_t begin_offset = aligned_base - extra_base; |
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126 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); |
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127 |
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128 if (begin_offset > 0) { |
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129 os::release_memory(extra_base, begin_offset); |
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130 } |
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131 |
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132 if (end_offset > 0) { |
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133 os::release_memory(extra_base + begin_offset + size, end_offset); |
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134 } |
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135 |
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136 return aligned_base; |
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137 } |
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138 |
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139 void os::Posix::print_load_average(outputStream* st) { |
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140 st->print("load average:"); |
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141 double loadavg[3]; |
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142 os::loadavg(loadavg, 3); |
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143 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); |
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144 st->cr(); |
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145 } |
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146 |
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147 void os::Posix::print_rlimit_info(outputStream* st) { |
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148 st->print("rlimit:"); |
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149 struct rlimit rlim; |
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150 |
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151 st->print(" STACK "); |
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152 getrlimit(RLIMIT_STACK, &rlim); |
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153 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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154 else st->print("%uk", rlim.rlim_cur >> 10); |
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155 |
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156 st->print(", CORE "); |
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157 getrlimit(RLIMIT_CORE, &rlim); |
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158 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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159 else st->print("%uk", rlim.rlim_cur >> 10); |
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160 |
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161 //Isn't there on solaris |
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162 #ifndef TARGET_OS_FAMILY_solaris |
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163 st->print(", NPROC "); |
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164 getrlimit(RLIMIT_NPROC, &rlim); |
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165 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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166 else st->print("%d", rlim.rlim_cur); |
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167 #endif |
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168 |
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169 st->print(", NOFILE "); |
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170 getrlimit(RLIMIT_NOFILE, &rlim); |
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171 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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172 else st->print("%d", rlim.rlim_cur); |
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173 |
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174 st->print(", AS "); |
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175 getrlimit(RLIMIT_AS, &rlim); |
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176 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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177 else st->print("%uk", rlim.rlim_cur >> 10); |
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178 st->cr(); |
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179 } |
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180 |
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181 void os::Posix::print_uname_info(outputStream* st) { |
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182 // kernel |
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183 st->print("uname:"); |
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184 struct utsname name; |
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185 uname(&name); |
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186 st->print(name.sysname); st->print(" "); |
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187 st->print(name.release); st->print(" "); |
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188 st->print(name.version); st->print(" "); |
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189 st->print(name.machine); |
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190 st->cr(); |
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191 } |
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192 |
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193 bool os::has_allocatable_memory_limit(julong* limit) { |
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194 struct rlimit rlim; |
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195 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); |
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196 // if there was an error when calling getrlimit, assume that there is no limitation |
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197 // on virtual memory. |
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198 bool result; |
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199 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { |
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200 result = false; |
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201 } else { |
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202 *limit = (julong)rlim.rlim_cur; |
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203 result = true; |
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204 } |
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205 #ifdef _LP64 |
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206 return result; |
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207 #else |
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208 // arbitrary virtual space limit for 32 bit Unices found by testing. If |
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209 // getrlimit above returned a limit, bound it with this limit. Otherwise |
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210 // directly use it. |
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211 const julong max_virtual_limit = (julong)3800*M; |
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212 if (result) { |
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213 *limit = MIN2(*limit, max_virtual_limit); |
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214 } else { |
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215 *limit = max_virtual_limit; |
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216 } |
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217 |
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218 // bound by actually allocatable memory. The algorithm uses two bounds, an |
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219 // upper and a lower limit. The upper limit is the current highest amount of |
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220 // memory that could not be allocated, the lower limit is the current highest |
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221 // amount of memory that could be allocated. |
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222 // The algorithm iteratively refines the result by halving the difference |
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223 // between these limits, updating either the upper limit (if that value could |
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224 // not be allocated) or the lower limit (if the that value could be allocated) |
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225 // until the difference between these limits is "small". |
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226 |
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227 // the minimum amount of memory we care about allocating. |
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228 const julong min_allocation_size = M; |
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229 |
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230 julong upper_limit = *limit; |
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231 |
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232 // first check a few trivial cases |
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233 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { |
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234 *limit = upper_limit; |
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235 } else if (!is_allocatable(min_allocation_size)) { |
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236 // we found that not even min_allocation_size is allocatable. Return it |
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237 // anyway. There is no point to search for a better value any more. |
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238 *limit = min_allocation_size; |
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239 } else { |
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240 // perform the binary search. |
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241 julong lower_limit = min_allocation_size; |
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242 while ((upper_limit - lower_limit) > min_allocation_size) { |
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243 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; |
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244 temp_limit = align_size_down_(temp_limit, min_allocation_size); |
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245 if (is_allocatable(temp_limit)) { |
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246 lower_limit = temp_limit; |
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247 } else { |
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248 upper_limit = temp_limit; |
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249 } |
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250 } |
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251 *limit = lower_limit; |
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252 } |
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253 return true; |
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254 #endif |
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255 } |
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256 |
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257 const char* os::get_current_directory(char *buf, size_t buflen) { |
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258 return getcwd(buf, buflen); |
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259 } |
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260 |
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261 FILE* os::open(int fd, const char* mode) { |
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262 return ::fdopen(fd, mode); |
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263 } |
11151 | 264 |
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265 // Builds a platform dependent Agent_OnLoad_<lib_name> function name |
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266 // which is used to find statically linked in agents. |
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267 // Parameters: |
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268 // sym_name: Symbol in library we are looking for |
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269 // lib_name: Name of library to look in, NULL for shared libs. |
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270 // is_absolute_path == true if lib_name is absolute path to agent |
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271 // such as "/a/b/libL.so" |
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272 // == false if only the base name of the library is passed in |
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273 // such as "L" |
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274 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, |
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275 bool is_absolute_path) { |
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276 char *agent_entry_name; |
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277 size_t len; |
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278 size_t name_len; |
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279 size_t prefix_len = strlen(JNI_LIB_PREFIX); |
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280 size_t suffix_len = strlen(JNI_LIB_SUFFIX); |
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281 const char *start; |
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282 |
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283 if (lib_name != NULL) { |
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284 len = name_len = strlen(lib_name); |
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285 if (is_absolute_path) { |
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286 // Need to strip path, prefix and suffix |
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287 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { |
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288 lib_name = ++start; |
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289 } |
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290 if (len <= (prefix_len + suffix_len)) { |
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291 return NULL; |
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292 } |
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293 lib_name += prefix_len; |
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294 name_len = strlen(lib_name) - suffix_len; |
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295 } |
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296 } |
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297 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; |
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298 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); |
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299 if (agent_entry_name == NULL) { |
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300 return NULL; |
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301 } |
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302 strcpy(agent_entry_name, sym_name); |
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303 if (lib_name != NULL) { |
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304 strcat(agent_entry_name, "_"); |
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305 strncat(agent_entry_name, lib_name, name_len); |
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306 } |
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307 return agent_entry_name; |
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308 } |
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309 |
11151 | 310 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { |
311 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); | |
312 } | |
313 | |
314 /* | |
315 * See the caveats for this class in os_posix.hpp | |
316 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this | |
317 * method and returns false. If none of the signals are raised, returns true. | |
318 * The callback is supposed to provide the method that should be protected. | |
319 */ | |
320 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { | |
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321 sigset_t saved_sig_mask; |
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322 |
11151 | 323 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); |
324 assert(!WatcherThread::watcher_thread()->has_crash_protection(), | |
325 "crash_protection already set?"); | |
326 | |
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327 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask |
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328 // since on at least some systems (OS X) siglongjmp will restore the mask |
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329 // for the process, not the thread |
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330 pthread_sigmask(0, NULL, &saved_sig_mask); |
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331 if (sigsetjmp(_jmpbuf, 0) == 0) { |
11151 | 332 // make sure we can see in the signal handler that we have crash protection |
333 // installed | |
334 WatcherThread::watcher_thread()->set_crash_protection(this); | |
335 cb.call(); | |
336 // and clear the crash protection | |
337 WatcherThread::watcher_thread()->set_crash_protection(NULL); | |
338 return true; | |
339 } | |
340 // this happens when we siglongjmp() back | |
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341 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); |
11151 | 342 WatcherThread::watcher_thread()->set_crash_protection(NULL); |
343 return false; | |
344 } | |
345 | |
346 void os::WatcherThreadCrashProtection::restore() { | |
347 assert(WatcherThread::watcher_thread()->has_crash_protection(), | |
348 "must have crash protection"); | |
349 | |
350 siglongjmp(_jmpbuf, 1); | |
351 } | |
352 | |
353 void os::WatcherThreadCrashProtection::check_crash_protection(int sig, | |
354 Thread* thread) { | |
355 | |
356 if (thread != NULL && | |
357 thread->is_Watcher_thread() && | |
358 WatcherThread::watcher_thread()->has_crash_protection()) { | |
359 | |
360 if (sig == SIGSEGV || sig == SIGBUS) { | |
361 WatcherThread::watcher_thread()->crash_protection()->restore(); | |
362 } | |
363 } | |
364 } |