Mercurial > hg > truffle
annotate src/os/aix/vm/jsig.c @ 14492:7f0e0366ec81
8035746: Add missing Klass::oop_is_instanceClassLoader() function
Reviewed-by: mgerdin, coleenp
author | stefank |
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date | Thu, 27 Feb 2014 10:36:50 +0100 |
parents | 666e6ce3976c |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright 2012, 2013 SAP AG. All rights reserved. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 /* CopyrightVersion 1.2 */ |
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27 |
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28 /* This is a special library that should be loaded before libc & |
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29 * libthread to interpose the signal handler installation functions: |
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30 * sigaction(), signal(), sigset(). |
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31 * Used for signal-chaining. See RFE 4381843. |
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32 */ |
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33 |
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34 #include <signal.h> |
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35 #include <dlfcn.h> |
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36 #include <pthread.h> |
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37 #include <stdio.h> |
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38 #include <stdlib.h> |
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39 |
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40 #define bool int |
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41 #define true 1 |
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42 #define false 0 |
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43 |
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44 // Highest so far on AIX 5.2 is SIGSAK (63) |
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45 #define MAXSIGNUM 63 |
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46 #define MASK(sig) ((unsigned int)1 << sig) |
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47 |
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48 static struct sigaction sact[MAXSIGNUM]; /* saved signal handlers */ |
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49 static unsigned int jvmsigs = 0; /* signals used by jvm */ |
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50 |
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51 /* used to synchronize the installation of signal handlers */ |
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52 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; |
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53 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; |
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54 static pthread_t tid = 0; |
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55 |
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56 typedef void (*sa_handler_t)(int); |
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57 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); |
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58 // signal_t is already defined on AIX |
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59 typedef sa_handler_t (*signal_like_function_t)(int, sa_handler_t); |
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60 typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *); |
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61 |
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62 static signal_like_function_t os_signal = 0; /* os's version of signal()/sigset() */ |
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63 static sigaction_t os_sigaction = 0; /* os's version of sigaction() */ |
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64 |
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65 static bool jvm_signal_installing = false; |
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66 static bool jvm_signal_installed = false; |
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67 |
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68 static void signal_lock() { |
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69 pthread_mutex_lock(&mutex); |
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70 /* When the jvm is installing its set of signal handlers, threads |
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71 * other than the jvm thread should wait */ |
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72 if (jvm_signal_installing) { |
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73 if (tid != pthread_self()) { |
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74 pthread_cond_wait(&cond, &mutex); |
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75 } |
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76 } |
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77 } |
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78 |
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79 static void signal_unlock() { |
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80 pthread_mutex_unlock(&mutex); |
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81 } |
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82 |
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83 static sa_handler_t call_os_signal(int sig, sa_handler_t disp, |
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84 bool is_sigset) { |
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85 if (os_signal == NULL) { |
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86 if (!is_sigset) { |
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87 // Aix: call functions directly instead of dlsym'ing them |
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88 os_signal = signal; |
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89 } else { |
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90 // Aix: call functions directly instead of dlsym'ing them |
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91 os_signal = sigset; |
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92 } |
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93 if (os_signal == NULL) { |
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94 printf("%s\n", dlerror()); |
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95 exit(0); |
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96 } |
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97 } |
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98 return (*os_signal)(sig, disp); |
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99 } |
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100 |
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101 static void save_signal_handler(int sig, sa_handler_t disp) { |
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102 sigset_t set; |
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103 sact[sig].sa_handler = disp; |
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104 sigemptyset(&set); |
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105 sact[sig].sa_mask = set; |
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106 sact[sig].sa_flags = 0; |
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107 } |
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108 |
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109 static sa_handler_t set_signal(int sig, sa_handler_t disp, bool is_sigset) { |
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110 sa_handler_t oldhandler; |
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111 bool sigused; |
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112 |
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113 signal_lock(); |
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114 |
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115 sigused = (MASK(sig) & jvmsigs) != 0; |
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116 if (jvm_signal_installed && sigused) { |
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117 /* jvm has installed its signal handler for this signal. */ |
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118 /* Save the handler. Don't really install it. */ |
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119 oldhandler = sact[sig].sa_handler; |
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120 save_signal_handler(sig, disp); |
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121 |
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122 signal_unlock(); |
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123 return oldhandler; |
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124 } else if (jvm_signal_installing) { |
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125 /* jvm is installing its signal handlers. Install the new |
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126 * handlers and save the old ones. jvm uses sigaction(). |
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127 * Leave the piece here just in case. */ |
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128 oldhandler = call_os_signal(sig, disp, is_sigset); |
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129 save_signal_handler(sig, oldhandler); |
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130 |
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131 /* Record the signals used by jvm */ |
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132 jvmsigs |= MASK(sig); |
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133 |
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134 signal_unlock(); |
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135 return oldhandler; |
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136 } else { |
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137 /* jvm has no relation with this signal (yet). Install the |
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138 * the handler. */ |
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139 oldhandler = call_os_signal(sig, disp, is_sigset); |
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140 |
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141 signal_unlock(); |
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142 return oldhandler; |
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143 } |
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144 } |
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145 |
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146 sa_handler_t signal(int sig, sa_handler_t disp) { |
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147 return set_signal(sig, disp, false); |
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148 } |
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149 |
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150 sa_handler_t sigset(int sig, sa_handler_t disp) { |
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151 return set_signal(sig, disp, true); |
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152 } |
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153 |
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154 static int call_os_sigaction(int sig, const struct sigaction *act, |
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155 struct sigaction *oact) { |
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156 if (os_sigaction == NULL) { |
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157 // Aix: call functions directly instead of dlsym'ing them |
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158 os_sigaction = sigaction; |
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159 if (os_sigaction == NULL) { |
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160 printf("%s\n", dlerror()); |
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161 exit(0); |
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162 } |
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163 } |
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164 return (*os_sigaction)(sig, act, oact); |
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165 } |
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166 |
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167 int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) { |
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168 int res; |
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169 bool sigused; |
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170 struct sigaction oldAct; |
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171 |
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172 signal_lock(); |
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173 |
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174 sigused = (MASK(sig) & jvmsigs) != 0; |
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175 if (jvm_signal_installed && sigused) { |
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176 /* jvm has installed its signal handler for this signal. */ |
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177 /* Save the handler. Don't really install it. */ |
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178 if (oact != NULL) { |
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179 *oact = sact[sig]; |
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180 } |
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181 if (act != NULL) { |
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182 sact[sig] = *act; |
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183 } |
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184 |
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185 signal_unlock(); |
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186 return 0; |
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187 } else if (jvm_signal_installing) { |
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188 /* jvm is installing its signal handlers. Install the new |
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189 * handlers and save the old ones. */ |
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190 res = call_os_sigaction(sig, act, &oldAct); |
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191 sact[sig] = oldAct; |
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192 if (oact != NULL) { |
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193 *oact = oldAct; |
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194 } |
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195 |
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196 /* Record the signals used by jvm */ |
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197 jvmsigs |= MASK(sig); |
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198 |
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199 signal_unlock(); |
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200 return res; |
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201 } else { |
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202 /* jvm has no relation with this signal (yet). Install the |
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203 * the handler. */ |
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204 res = call_os_sigaction(sig, act, oact); |
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205 |
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206 signal_unlock(); |
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207 return res; |
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208 } |
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209 } |
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210 |
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211 /* The three functions for the jvm to call into */ |
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212 void JVM_begin_signal_setting() { |
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213 signal_lock(); |
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214 jvm_signal_installing = true; |
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215 tid = pthread_self(); |
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216 signal_unlock(); |
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217 } |
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218 |
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219 void JVM_end_signal_setting() { |
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220 signal_lock(); |
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221 jvm_signal_installed = true; |
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222 jvm_signal_installing = false; |
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223 pthread_cond_broadcast(&cond); |
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224 signal_unlock(); |
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225 } |
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226 |
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227 struct sigaction *JVM_get_signal_action(int sig) { |
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228 /* Does race condition make sense here? */ |
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229 if ((MASK(sig) & jvmsigs) != 0) { |
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230 return &sact[sig]; |
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231 } |
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232 return NULL; |
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233 } |