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comparison src/os/windows/vm/jvm_windows.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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1 /*
2 * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_jvm_windows.cpp.incl"
27
28 #include <signal.h>
29
30 JVM_LEAF(void*, JVM_GetThreadInterruptEvent())
31 return Thread::current()->osthread()->interrupt_event();
32 JVM_END
33
34 // sun.misc.Signal ///////////////////////////////////////////////////////////
35 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
36 /*
37 * This function is included primarily as a debugging aid. If Java is
38 * running in a console window, then pressing <CTRL-BREAK> will cause
39 * the current state of all active threads and monitors to be written
40 * to the console window.
41 */
42
43 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
44 // Copied from classic vm
45 // signals_md.c 1.4 98/08/23
46 void* newHandler = handler == (void *)2
47 ? os::user_handler()
48 : handler;
49 switch (sig) {
50 case SIGFPE:
51 return (void *)-1; /* already used by VM */
52 case SIGBREAK:
53 if (!ReduceSignalUsage) return (void *)-1;
54
55 /* The following signals are used for Shutdown Hooks support. However, if
56 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
57 System.exit(), Java is not allowed to use these signals, and the the
58 user is allowed to set his own _native_ handler for these signals and
59 invoke System.exit() as needed. Terminator.setup() is avoiding
60 registration of these signals when -Xrs is present. */
61 case SHUTDOWN1_SIGNAL:
62 case SHUTDOWN2_SIGNAL:
63 if (ReduceSignalUsage) return (void*)-1;
64 }
65
66 void* oldHandler = os::signal(sig, newHandler);
67 if (oldHandler == os::user_handler()) {
68 return (void *)2;
69 } else {
70 return oldHandler;
71 }
72 JVM_END
73
74
75 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
76 if (ReduceSignalUsage) {
77 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,BREAK_SIGNAL
78 // to be raised when ReduceSignalUsage is set, since no handler
79 // for them is actually registered in JVM or via JVM_RegisterSignal.
80 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
81 sig == SIGBREAK) {
82 return JNI_FALSE;
83 }
84 }
85 os::signal_raise(sig);
86 return JNI_TRUE;
87 JVM_END
88
89
90 /*
91 All the defined signal names for Windows.
92
93 NOTE that not all of these names are accepted by FindSignal!
94
95 For various reasons some of these may be rejected at runtime.
96
97 Here are the names currently accepted by a user of sun.misc.Signal with
98 1.4.1 (ignoring potential interaction with use of chaining, etc):
99
100 (LIST TBD)
101
102 */
103 struct siglabel {
104 char *name;
105 int number;
106 };
107
108 struct siglabel siglabels[] =
109 /* derived from version 6.0 VC98/include/signal.h */
110 {"ABRT", SIGABRT, /* abnormal termination triggered by abort cl */
111 "FPE", SIGFPE, /* floating point exception */
112 "SEGV", SIGSEGV, /* segment violation */
113 "INT", SIGINT, /* interrupt */
114 "TERM", SIGTERM, /* software term signal from kill */
115 "BREAK", SIGBREAK, /* Ctrl-Break sequence */
116 "ILL", SIGILL}; /* illegal instruction */
117
118 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
119 /* find and return the named signal's number */
120
121 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
122 if(!strcmp(name, siglabels[i].name))
123 return siglabels[i].number;
124 return -1;
125 JVM_END