1 /*
2 * Copyright (c) 1997, 2006, 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 *
23 */
24
25 // This is embedded via include into the class OSThread
26
27 private:
28
29 thread_t _thread_id; // Solaris thread id
30 unsigned int _lwp_id; // lwp ID, only used with bound threads
31 sigset_t _caller_sigmask; // Caller's signal mask
32 bool _vm_created_thread; // true if the VM create this thread
33 // false if primary thread or attached thread
34 public:
35
36 thread_t thread_id() const { return _thread_id; }
37
38 unsigned int lwp_id() const { return _lwp_id; }
39
40 // Set and get state of _vm_created_thread flag
41 void set_vm_created() { _vm_created_thread = true; }
42 bool is_vm_created() { return _vm_created_thread; }
43
44 // Methods to save/restore caller's signal mask
45 sigset_t caller_sigmask() const { return _caller_sigmask; }
46 void set_caller_sigmask(sigset_t sigmask) { _caller_sigmask = sigmask; }
47
48 #ifndef PRODUCT
49 // Used for debugging, return a unique integer for each thread.
50 int thread_identifier() const { return _thread_id; }
51 #endif
52 #ifdef ASSERT
53 // On solaris reposition can fail in two ways:
54 // 1: a mismatched pc, because signal is delivered too late, target thread
55 // is resumed.
56 // 2: on a timeout where signal is lost, target thread is resumed.
57 bool valid_reposition_failure() {
58 // only 1 and 2 can happen and we can handle both of them
59 return true;
60 }
61 #endif
62 void set_thread_id(thread_t id) { _thread_id = id; }
63 void set_lwp_id(unsigned int id){ _lwp_id = id; }
64
65 // ***************************************************************
66 // interrupt support. interrupts (using signals) are used to get
67 // the thread context (get_thread_pc), to set the thread context
68 // (set_thread_pc), and to implement java.lang.Thread.interrupt.
69 // ***************************************************************
70
71 public:
72
73 class InterruptArguments : StackObj {
74 private:
75 Thread* _thread; // the thread to signal was dispatched to
76 ucontext_t* _ucontext; // the machine context at the time of the signal
77
78 public:
79 InterruptArguments(Thread* thread, ucontext_t* ucontext) {
80 _thread = thread;
81 _ucontext = ucontext;
82 }
83
84 Thread* thread() const { return _thread; }
85 ucontext_t* ucontext() const { return _ucontext; }
86 };
87
88 // There are currently no asynchronous callbacks - and we'd better not
89 // support them in the future either, as they need to be deallocated from
90 // the interrupt handler, which is not safe; they also require locks to
91 // protect the callback queue.
92
93 class Sync_Interrupt_Callback : private StackObj {
94 protected:
95 volatile bool _is_done;
96 Monitor* _sync;
97 Thread* _target;
98 public:
99 Sync_Interrupt_Callback(Monitor * sync) {
100 _is_done = false; _target = NULL; _sync = sync;
101 }
102
103 bool is_done() const { return _is_done; }
104 Thread* target() const { return _target; }
105
106 int interrupt(Thread * target, int timeout);
107
108 // override to implement the callback.
109 virtual void execute(InterruptArguments *args) = 0;
110
111 void leave_callback();
112 };
113
114 private:
115
116 Sync_Interrupt_Callback * volatile _current_callback;
117 enum {
118 callback_in_progress = 1
119 };
120 Mutex * _current_callback_lock; // only used on v8
121
122 public:
123
124 int set_interrupt_callback (Sync_Interrupt_Callback * cb);
125 void remove_interrupt_callback(Sync_Interrupt_Callback * cb);
126 void do_interrupt_callbacks_at_interrupt(InterruptArguments *args);
127
128 // ***************************************************************
129 // java.lang.Thread.interrupt state.
130 // ***************************************************************
131
132 private:
133
134 JavaThreadState _saved_interrupt_thread_state; // the thread state before a system call -- restored afterward
135
136 public:
137
138
139 JavaThreadState saved_interrupt_thread_state() { return _saved_interrupt_thread_state; }
140 void set_saved_interrupt_thread_state(JavaThreadState state) { _saved_interrupt_thread_state = state; }
141
142 static void handle_spinlock_contention(int tries); // Used for thread local eden locking
143
144 // ***************************************************************
145 // Platform dependent initialization and cleanup
146 // ***************************************************************
147
148 private:
149
150 void pd_initialize();
151 void pd_destroy();