Mercurial > hg > truffle
annotate src/os/linux/vm/jvm_linux.cpp @ 12986:1b422ef5288a
8025728: Missing volatile specifier for field G1AllocRegion::_alloc_region
Summary: The field G1AllocRegion::_alloc_region needs to be declared volatile as it is used with that intention. Otherwise the compiler may generate the code that reloads the value which might have changed in the meantime, leading to spurious crashes.
Reviewed-by: iveresov, simonis, tschatzl
Contributed-by: Axel Siebenborn <axel.siebenborn@sap.com>
| author | tschatzl |
|---|---|
| date | Wed, 23 Oct 2013 10:23:06 +0200 |
| parents | 1d1603768966 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "prims/jvm.h" | |
| 27 #include "runtime/interfaceSupport.hpp" | |
| 28 #include "runtime/osThread.hpp" | |
| 0 | 29 |
| 30 #include <signal.h> | |
| 31 | |
| 32 | |
| 33 // sun.misc.Signal /////////////////////////////////////////////////////////// | |
| 34 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23 | |
| 35 /* | |
| 36 * This function is included primarily as a debugging aid. If Java is | |
| 37 * running in a console window, then pressing <CTRL-\\> will cause | |
| 38 * the current state of all active threads and monitors to be written | |
| 39 * to the console window. | |
| 40 */ | |
| 41 | |
| 42 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler)) | |
| 43 // Copied from classic vm | |
| 44 // signals_md.c 1.4 98/08/23 | |
| 45 void* newHandler = handler == (void *)2 | |
| 46 ? os::user_handler() | |
| 47 : handler; | |
| 48 switch (sig) { | |
| 49 /* The following are already used by the VM. */ | |
| 50 case INTERRUPT_SIGNAL: | |
| 51 case SIGFPE: | |
| 52 case SIGILL: | |
| 53 case SIGSEGV: | |
| 54 | |
| 55 /* The following signal is used by the VM to dump thread stacks unless | |
| 56 ReduceSignalUsage is set, in which case the user is allowed to set | |
| 57 his own _native_ handler for this signal; thus, in either case, | |
| 58 we do not allow JVM_RegisterSignal to change the handler. */ | |
| 59 case BREAK_SIGNAL: | |
| 60 return (void *)-1; | |
| 61 | |
| 62 /* The following signals are used for Shutdown Hooks support. However, if | |
| 63 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via | |
| 64 System.exit(), Java is not allowed to use these signals, and the the | |
| 65 user is allowed to set his own _native_ handler for these signals and | |
| 66 invoke System.exit() as needed. Terminator.setup() is avoiding | |
| 67 registration of these signals when -Xrs is present. | |
| 68 - If the HUP signal is ignored (from the nohup) command, then Java | |
| 69 is not allowed to use this signal. | |
| 70 */ | |
| 71 | |
| 72 case SHUTDOWN1_SIGNAL: | |
| 73 case SHUTDOWN2_SIGNAL: | |
| 74 case SHUTDOWN3_SIGNAL: | |
| 75 if (ReduceSignalUsage) return (void*)-1; | |
| 76 if (os::Linux::is_sig_ignored(sig)) return (void*)1; | |
| 77 } | |
| 78 | |
| 79 void* oldHandler = os::signal(sig, newHandler); | |
| 80 if (oldHandler == os::user_handler()) { | |
| 81 return (void *)2; | |
| 82 } else { | |
| 83 return oldHandler; | |
| 84 } | |
| 85 JVM_END | |
| 86 | |
| 87 | |
| 88 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig)) | |
| 89 if (ReduceSignalUsage) { | |
| 90 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL, | |
| 91 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since | |
| 92 // no handler for them is actually registered in JVM or via | |
| 93 // JVM_RegisterSignal. | |
| 94 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || | |
| 95 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) { | |
| 96 return JNI_FALSE; | |
| 97 } | |
| 98 } | |
| 99 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || | |
| 100 sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) { | |
| 101 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL | |
| 102 // is ignored, since no handler for them is actually registered in JVM | |
| 103 // or via JVM_RegisterSignal. | |
| 104 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL | |
| 105 return JNI_FALSE; | |
| 106 } | |
| 107 | |
| 108 os::signal_raise(sig); | |
| 109 return JNI_TRUE; | |
| 110 JVM_END | |
| 111 | |
| 112 /* | |
| 113 All the defined signal names for Linux. | |
| 114 | |
| 115 NOTE that not all of these names are accepted by our Java implementation | |
| 116 | |
| 117 Via an existing claim by the VM, sigaction restrictions, or | |
| 118 the "rules of Unix" some of these names will be rejected at runtime. | |
| 119 For example the VM sets up to handle USR1, sigaction returns EINVAL for | |
| 120 STOP, and Linux simply doesn't allow catching of KILL. | |
| 121 | |
| 122 Here are the names currently accepted by a user of sun.misc.Signal with | |
| 123 1.4.1 (ignoring potential interaction with use of chaining, etc): | |
| 124 | |
| 125 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT, | |
| 126 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF, | |
| 127 WINCH, POLL, IO, PWR, SYS | |
| 128 | |
| 129 */ | |
| 130 | |
| 131 struct siglabel { | |
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132 const char *name; |
| 0 | 133 int number; |
| 134 }; | |
| 135 | |
| 136 struct siglabel siglabels[] = { | |
| 137 /* derived from /usr/include/bits/signum.h on RH7.2 */ | |
| 138 "HUP", SIGHUP, /* Hangup (POSIX). */ | |
| 139 "INT", SIGINT, /* Interrupt (ANSI). */ | |
| 140 "QUIT", SIGQUIT, /* Quit (POSIX). */ | |
| 141 "ILL", SIGILL, /* Illegal instruction (ANSI). */ | |
| 142 "TRAP", SIGTRAP, /* Trace trap (POSIX). */ | |
| 143 "ABRT", SIGABRT, /* Abort (ANSI). */ | |
| 144 "IOT", SIGIOT, /* IOT trap (4.2 BSD). */ | |
| 145 "BUS", SIGBUS, /* BUS error (4.2 BSD). */ | |
| 146 "FPE", SIGFPE, /* Floating-point exception (ANSI). */ | |
| 147 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */ | |
| 148 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */ | |
| 149 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */ | |
| 150 "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */ | |
| 151 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */ | |
| 152 "ALRM", SIGALRM, /* Alarm clock (POSIX). */ | |
| 153 "TERM", SIGTERM, /* Termination (ANSI). */ | |
| 154 #ifdef SIGSTKFLT | |
| 155 "STKFLT", SIGSTKFLT, /* Stack fault. */ | |
| 156 #endif | |
| 157 "CLD", SIGCLD, /* Same as SIGCHLD (System V). */ | |
| 158 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */ | |
| 159 "CONT", SIGCONT, /* Continue (POSIX). */ | |
| 160 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */ | |
| 161 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */ | |
| 162 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */ | |
| 163 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */ | |
| 164 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */ | |
| 165 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */ | |
| 166 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */ | |
| 167 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */ | |
| 168 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */ | |
| 169 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */ | |
| 170 "POLL", SIGPOLL, /* Pollable event occurred (System V). */ | |
| 171 "IO", SIGIO, /* I/O now possible (4.2 BSD). */ | |
| 172 "PWR", SIGPWR, /* Power failure restart (System V). */ | |
| 173 #ifdef SIGSYS | |
| 174 "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */ | |
| 175 #endif | |
| 176 }; | |
| 177 | |
| 178 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) | |
| 179 | |
| 180 /* find and return the named signal's number */ | |
| 181 | |
| 182 for(uint i=0; i<ARRAY_SIZE(siglabels); i++) | |
| 183 if(!strcmp(name, siglabels[i].name)) | |
| 184 return siglabels[i].number; | |
| 185 | |
| 186 return -1; | |
| 187 | |
| 188 JVM_END | |
| 189 | |
| 190 // used by os::exception_name() | |
| 191 extern bool signal_name(int signo, char* buf, size_t len) { | |
| 192 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) { | |
| 193 if (signo == siglabels[i].number) { | |
| 194 jio_snprintf(buf, len, "SIG%s", siglabels[i].name); | |
| 195 return true; | |
| 196 } | |
| 197 } | |
| 198 return false; | |
| 199 } |