1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. 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 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 *
60 //
61 bool valid_reposition_failure() {
62 return false;
63 }
64 #endif // ASSERT
65 pthread_t pthread_id() const {
66 return _pthread_id;
67 }
68 void set_pthread_id(pthread_t tid) {
69 _pthread_id = tid;
70 }
71
72 // ***************************************************************
73 // suspension support.
74 // ***************************************************************
75
76 public:
77 // flags that support signal based suspend/resume on Linux are in a
78 // separate class to avoid confusion with many flags in OSThread that
79 // are used by VM level suspend/resume.
80 os::Linux::SuspendResume sr;
81
82 // _ucontext and _siginfo are used by SR_handler() to save thread context,
83 // and they will later be used to walk the stack or reposition thread PC.
84 // If the thread is not suspended in SR_handler() (e.g. self suspend),
85 // the value in _ucontext is meaningless, so we must use the last Java
86 // frame information as the frame. This will mean that for threads
87 // that are parked on a mutex the profiler (and safepoint mechanism)
88 // will see the thread as if it were still in the Java frame. This
89 // not a problem for the profiler since the Java frame is a close
90 // enough result. For the safepoint mechanism when the give it the
91 // Java frame we are not at a point where the safepoint needs the
92 // frame to that accurate (like for a compiled safepoint) since we
93 // should be in a place where we are native and will block ourselves
94 // if we transition.
95 private:
96 void* _siginfo;
97 ucontext_t* _ucontext;
98 int _expanding_stack; /* non zero if manually expanding stack */
99 address _alt_sig_stack; /* address of base of alternate signal stack */
100
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1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. 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 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 *
60 //
61 bool valid_reposition_failure() {
62 return false;
63 }
64 #endif // ASSERT
65 pthread_t pthread_id() const {
66 return _pthread_id;
67 }
68 void set_pthread_id(pthread_t tid) {
69 _pthread_id = tid;
70 }
71
72 // ***************************************************************
73 // suspension support.
74 // ***************************************************************
75
76 public:
77 // flags that support signal based suspend/resume on Linux are in a
78 // separate class to avoid confusion with many flags in OSThread that
79 // are used by VM level suspend/resume.
80 os::SuspendResume sr;
81
82 // _ucontext and _siginfo are used by SR_handler() to save thread context,
83 // and they will later be used to walk the stack or reposition thread PC.
84 // If the thread is not suspended in SR_handler() (e.g. self suspend),
85 // the value in _ucontext is meaningless, so we must use the last Java
86 // frame information as the frame. This will mean that for threads
87 // that are parked on a mutex the profiler (and safepoint mechanism)
88 // will see the thread as if it were still in the Java frame. This
89 // not a problem for the profiler since the Java frame is a close
90 // enough result. For the safepoint mechanism when the give it the
91 // Java frame we are not at a point where the safepoint needs the
92 // frame to that accurate (like for a compiled safepoint) since we
93 // should be in a place where we are native and will block ourselves
94 // if we transition.
95 private:
96 void* _siginfo;
97 ucontext_t* _ucontext;
98 int _expanding_stack; /* non zero if manually expanding stack */
99 address _alt_sig_stack; /* address of base of alternate signal stack */
100
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