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