os_bsd.hpp revision 6687:da4514678bcf 
1/*
2 * Copyright (c) 1999, 2014, 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/* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
34typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
35
36#ifdef __APPLE__
37// Mac OS X doesn't support clock_gettime. Stub out the type, it is
38// unused
39typedef int clockid_t;
40#endif
41
42class Bsd {
43  friend class os;
44
45  // For signal-chaining
46#define MAXSIGNUM 32
47  static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
48  static unsigned int sigs;             // mask of signals that have
49                                        // preinstalled signal handlers
50  static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
51                                        // __sigaction(), signal() is loaded
52  static struct sigaction *(*get_signal_action)(int);
53  static struct sigaction *get_preinstalled_handler(int);
54  static void save_preinstalled_handler(int, struct sigaction&);
55
56  static void check_signal_handler(int sig);
57
58  // For signal flags diagnostics
59  static int sigflags[MAXSIGNUM];
60
61#ifdef __APPLE__
62  // mach_absolute_time
63  static mach_timebase_info_data_t _timebase_info;
64  static volatile uint64_t         _max_abstime;
65#else
66  static int (*_clock_gettime)(clockid_t, struct timespec *);
67#endif
68
69  static GrowableArray<int>* _cpu_to_node;
70
71 protected:
72
73  static julong _physical_memory;
74  static pthread_t _main_thread;
75  static int _page_size;
76
77  static julong available_memory();
78  static julong physical_memory() { return _physical_memory; }
79  static void initialize_system_info();
80
81  static bool supports_variable_stack_size();
82
83  static void rebuild_cpu_to_node_map();
84  static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
85
86  static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
87
88 public:
89
90  static void init_thread_fpu_state();
91  static pthread_t main_thread(void)                                { return _main_thread; }
92
93  static void hotspot_sigmask(Thread* thread);
94
95  static bool is_initial_thread(void);
96  static pid_t gettid();
97
98  static int page_size(void)                                        { return _page_size; }
99  static void set_page_size(int val)                                { _page_size = val; }
100
101  static address   ucontext_get_pc(ucontext_t* uc);
102  static intptr_t* ucontext_get_sp(ucontext_t* uc);
103  static intptr_t* ucontext_get_fp(ucontext_t* uc);
104
105  // For Analyzer Forte AsyncGetCallTrace profiling support:
106  //
107  // This interface should be declared in os_bsd_i486.hpp, but
108  // that file provides extensions to the os class and not the
109  // Bsd class.
110  static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
111    intptr_t** ret_sp, intptr_t** ret_fp);
112
113  // This boolean allows users to forward their own non-matching signals
114  // to JVM_handle_bsd_signal, harmlessly.
115  static bool signal_handlers_are_installed;
116
117  static int get_our_sigflags(int);
118  static void set_our_sigflags(int, int);
119  static void signal_sets_init();
120  static void install_signal_handlers();
121  static void set_signal_handler(int, bool);
122  static bool is_sig_ignored(int sig);
123
124  static sigset_t* unblocked_signals();
125  static sigset_t* vm_signals();
126  static sigset_t* allowdebug_blocked_signals();
127
128  // For signal-chaining
129  static struct sigaction *get_chained_signal_action(int sig);
130  static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
131
132  // Minimum stack size a thread can be created with (allowing
133  // the VM to completely create the thread and enter user code)
134  static size_t min_stack_allowed;
135
136  // Return default stack size or guard size for the specified thread type
137  static size_t default_stack_size(os::ThreadType thr_type);
138  static size_t default_guard_size(os::ThreadType thr_type);
139
140  // Real-time clock functions
141  static void clock_init(void);
142
143  // Stack repair handling
144
145  // none present
146
147  // BsdThreads work-around for 6292965
148  static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
149
150private:
151  typedef int (*sched_getcpu_func_t)(void);
152  typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
153  typedef int (*numa_max_node_func_t)(void);
154  typedef int (*numa_available_func_t)(void);
155  typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
156  typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
157
158  static sched_getcpu_func_t _sched_getcpu;
159  static numa_node_to_cpus_func_t _numa_node_to_cpus;
160  static numa_max_node_func_t _numa_max_node;
161  static numa_available_func_t _numa_available;
162  static numa_tonode_memory_func_t _numa_tonode_memory;
163  static numa_interleave_memory_func_t _numa_interleave_memory;
164  static unsigned long* _numa_all_nodes;
165
166  static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
167  static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
168  static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
169  static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
170  static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
171  static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
172  static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
173public:
174  static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
175  static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
176    return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
177  }
178  static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
179  static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
180  static int numa_tonode_memory(void *start, size_t size, int node) {
181    return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
182  }
183  static void numa_interleave_memory(void *start, size_t size) {
184    if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
185      _numa_interleave_memory(start, size, _numa_all_nodes);
186    }
187  }
188  static int get_node_by_cpu(int cpu_id);
189};
190
191
192class PlatformEvent : public CHeapObj<mtInternal> {
193  private:
194    double CachePad[4];   // increase odds that _mutex is sole occupant of cache line
195    volatile int _Event;
196    volatile int _nParked;
197    pthread_mutex_t _mutex[1];
198    pthread_cond_t  _cond[1];
199    double PostPad[2];
200    Thread * _Assoc;
201
202  public:       // TODO-FIXME: make dtor private
203    ~PlatformEvent() { guarantee(0, "invariant"); }
204
205  public:
206    PlatformEvent() {
207      int status;
208      status = pthread_cond_init (_cond, NULL);
209      assert_status(status == 0, status, "cond_init");
210      status = pthread_mutex_init (_mutex, NULL);
211      assert_status(status == 0, status, "mutex_init");
212      _Event   = 0;
213      _nParked = 0;
214      _Assoc   = NULL;
215    }
216
217    // Use caution with reset() and fired() -- they may require MEMBARs
218    void reset() { _Event = 0; }
219    int  fired() { return _Event; }
220    void park();
221    void unpark();
222    int  park(jlong millis);
223    void SetAssociation(Thread * a) { _Assoc = a; }
224};
225
226class PlatformParker : public CHeapObj<mtInternal> {
227  protected:
228    pthread_mutex_t _mutex[1];
229    pthread_cond_t  _cond[1];
230
231  public:       // TODO-FIXME: make dtor private
232    ~PlatformParker() { guarantee(0, "invariant"); }
233
234  public:
235    PlatformParker() {
236      int status;
237      status = pthread_cond_init (_cond, NULL);
238      assert_status(status == 0, status, "cond_init");
239      status = pthread_mutex_init (_mutex, NULL);
240      assert_status(status == 0, status, "mutex_init");
241    }
242};
243
244#endif // OS_BSD_VM_OS_BSD_HPP
245