os_bsd.hpp revision 9433:149cc1f9f1aa 
1/*
2 * Copyright (c) 1999, 2015, 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#ifndef OS_BSD_VM_OS_BSD_HPP
26#define OS_BSD_VM_OS_BSD_HPP
27
28// Bsd_OS defines the interface to Bsd operating systems
29
30// Information about the protection of the page at address '0' on this os.
31static bool zero_page_read_protected() { return true; }
32
33#ifdef __APPLE__
34// Mac OS X doesn't support clock_gettime. Stub out the type, it is
35// unused
36typedef int clockid_t;
37#endif
38
39class Bsd {
40  friend class os;
41
42  // For signal-chaining
43  static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
44                                        // __sigaction(), signal() is loaded
45  static struct sigaction *(*get_signal_action)(int);
46  static struct sigaction *get_preinstalled_handler(int);
47  static void save_preinstalled_handler(int, struct sigaction&);
48
49  static void check_signal_handler(int sig);
50
51#ifdef __APPLE__
52  // mach_absolute_time
53  static mach_timebase_info_data_t _timebase_info;
54  static volatile uint64_t         _max_abstime;
55#else
56  static int (*_clock_gettime)(clockid_t, struct timespec *);
57#endif
58
59  static GrowableArray<int>* _cpu_to_node;
60
61 protected:
62
63  static julong _physical_memory;
64  static pthread_t _main_thread;
65  static int _page_size;
66
67  static julong available_memory();
68  static julong physical_memory() { return _physical_memory; }
69  static void initialize_system_info();
70
71  static void rebuild_cpu_to_node_map();
72  static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
73
74  static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
75
76 public:
77
78  static void init_thread_fpu_state();
79  static pthread_t main_thread(void)                                { return _main_thread; }
80
81  static void hotspot_sigmask(Thread* thread);
82
83  static bool is_initial_thread(void);
84  static pid_t gettid();
85
86  static int page_size(void)                                        { return _page_size; }
87  static void set_page_size(int val)                                { _page_size = val; }
88
89  static address   ucontext_get_pc(ucontext_t* uc);
90  static void ucontext_set_pc(ucontext_t* uc, address pc);
91  static intptr_t* ucontext_get_sp(ucontext_t* uc);
92  static intptr_t* ucontext_get_fp(ucontext_t* uc);
93
94  // For Analyzer Forte AsyncGetCallTrace profiling support:
95  //
96  // This interface should be declared in os_bsd_i486.hpp, but
97  // that file provides extensions to the os class and not the
98  // Bsd class.
99  static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
100                                              intptr_t** ret_sp, intptr_t** ret_fp);
101
102  // This boolean allows users to forward their own non-matching signals
103  // to JVM_handle_bsd_signal, harmlessly.
104  static bool signal_handlers_are_installed;
105
106  static int get_our_sigflags(int);
107  static void set_our_sigflags(int, int);
108  static void signal_sets_init();
109  static void install_signal_handlers();
110  static void set_signal_handler(int, bool);
111  static bool is_sig_ignored(int sig);
112
113  static sigset_t* unblocked_signals();
114  static sigset_t* vm_signals();
115  static sigset_t* allowdebug_blocked_signals();
116
117  // For signal-chaining
118  static struct sigaction *get_chained_signal_action(int sig);
119  static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
120
121  // Minimum stack size a thread can be created with (allowing
122  // the VM to completely create the thread and enter user code)
123  static size_t min_stack_allowed;
124
125  // Return default stack size or guard size for the specified thread type
126  static size_t default_stack_size(os::ThreadType thr_type);
127  static size_t default_guard_size(os::ThreadType thr_type);
128
129  // Real-time clock functions
130  static void clock_init(void);
131
132  // Stack repair handling
133
134  // none present
135
136 private:
137  typedef int (*sched_getcpu_func_t)(void);
138  typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
139  typedef int (*numa_max_node_func_t)(void);
140  typedef int (*numa_available_func_t)(void);
141  typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
142  typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
143
144  static sched_getcpu_func_t _sched_getcpu;
145  static numa_node_to_cpus_func_t _numa_node_to_cpus;
146  static numa_max_node_func_t _numa_max_node;
147  static numa_available_func_t _numa_available;
148  static numa_tonode_memory_func_t _numa_tonode_memory;
149  static numa_interleave_memory_func_t _numa_interleave_memory;
150  static unsigned long* _numa_all_nodes;
151
152  static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
153  static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
154  static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
155  static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
156  static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
157  static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
158  static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
159 public:
160  static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
161  static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
162    return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
163  }
164  static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
165  static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
166  static int numa_tonode_memory(void *start, size_t size, int node) {
167    return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
168  }
169  static void numa_interleave_memory(void *start, size_t size) {
170    if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
171      _numa_interleave_memory(start, size, _numa_all_nodes);
172    }
173  }
174  static int get_node_by_cpu(int cpu_id);
175};
176
177
178class PlatformEvent : public CHeapObj<mtInternal> {
179 private:
180  double CachePad[4];   // increase odds that _mutex is sole occupant of cache line
181  volatile int _Event;
182  volatile int _nParked;
183  pthread_mutex_t _mutex[1];
184  pthread_cond_t  _cond[1];
185  double PostPad[2];
186  Thread * _Assoc;
187
188 public:       // TODO-FIXME: make dtor private
189  ~PlatformEvent() { guarantee(0, "invariant"); }
190
191 public:
192  PlatformEvent() {
193    int status;
194    status = pthread_cond_init(_cond, NULL);
195    assert_status(status == 0, status, "cond_init");
196    status = pthread_mutex_init(_mutex, NULL);
197    assert_status(status == 0, status, "mutex_init");
198    _Event   = 0;
199    _nParked = 0;
200    _Assoc   = NULL;
201  }
202
203  // Use caution with reset() and fired() -- they may require MEMBARs
204  void reset() { _Event = 0; }
205  int  fired() { return _Event; }
206  void park();
207  void unpark();
208  int  park(jlong millis);
209  void SetAssociation(Thread * a) { _Assoc = a; }
210};
211
212class PlatformParker : public CHeapObj<mtInternal> {
213 protected:
214  pthread_mutex_t _mutex[1];
215  pthread_cond_t  _cond[1];
216
217 public:       // TODO-FIXME: make dtor private
218  ~PlatformParker() { guarantee(0, "invariant"); }
219
220 public:
221  PlatformParker() {
222    int status;
223    status = pthread_cond_init(_cond, NULL);
224    assert_status(status == 0, status, "cond_init");
225    status = pthread_mutex_init(_mutex, NULL);
226    assert_status(status == 0, status, "mutex_init");
227  }
228};
229
230#endif // OS_BSD_VM_OS_BSD_HPP
231