os_bsd.hpp revision 4802:f2110083203d
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 * 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/* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */ 31typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); 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#define MAXSIGNUM 32 44 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions 45 static unsigned int sigs; // mask of signals that have 46 // preinstalled signal handlers 47 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 48 // __sigaction(), signal() is loaded 49 static struct sigaction *(*get_signal_action)(int); 50 static struct sigaction *get_preinstalled_handler(int); 51 static void save_preinstalled_handler(int, struct sigaction&); 52 53 static void check_signal_handler(int sig); 54 55 // For signal flags diagnostics 56 static int sigflags[MAXSIGNUM]; 57 58 static int (*_clock_gettime)(clockid_t, struct timespec *); 59 60 static GrowableArray<int>* _cpu_to_node; 61 62 protected: 63 64 static julong _physical_memory; 65 static pthread_t _main_thread; 66 static int _page_size; 67 68 static julong available_memory(); 69 static julong physical_memory() { return _physical_memory; } 70 static void initialize_system_info(); 71 72 static bool supports_variable_stack_size(); 73 74 static void rebuild_cpu_to_node_map(); 75 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 76 77 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 78 79 public: 80 81 static void init_thread_fpu_state(); 82 static pthread_t main_thread(void) { return _main_thread; } 83 84 static void hotspot_sigmask(Thread* thread); 85 86 static bool is_initial_thread(void); 87 88 static int page_size(void) { return _page_size; } 89 static void set_page_size(int val) { _page_size = val; } 90 91 static address ucontext_get_pc(ucontext_t* uc); 92 static intptr_t* ucontext_get_sp(ucontext_t* uc); 93 static intptr_t* ucontext_get_fp(ucontext_t* uc); 94 95 // For Analyzer Forte AsyncGetCallTrace profiling support: 96 // 97 // This interface should be declared in os_bsd_i486.hpp, but 98 // that file provides extensions to the os class and not the 99 // Bsd class. 100 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 101 intptr_t** ret_sp, intptr_t** ret_fp); 102 103 // This boolean allows users to forward their own non-matching signals 104 // to JVM_handle_bsd_signal, harmlessly. 105 static bool signal_handlers_are_installed; 106 107 static int get_our_sigflags(int); 108 static void set_our_sigflags(int, int); 109 static void signal_sets_init(); 110 static void install_signal_handlers(); 111 static void set_signal_handler(int, bool); 112 static bool is_sig_ignored(int sig); 113 114 static sigset_t* unblocked_signals(); 115 static sigset_t* vm_signals(); 116 static sigset_t* allowdebug_blocked_signals(); 117 118 // For signal-chaining 119 static struct sigaction *get_chained_signal_action(int sig); 120 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 121 122 // Minimum stack size a thread can be created with (allowing 123 // the VM to completely create the thread and enter user code) 124 static size_t min_stack_allowed; 125 126 // Return default stack size or guard size for the specified thread type 127 static size_t default_stack_size(os::ThreadType thr_type); 128 static size_t default_guard_size(os::ThreadType thr_type); 129 130 // Real-time clock functions 131 static void clock_init(void); 132 133 static inline bool supports_monotonic_clock() { 134 return _clock_gettime != NULL; 135 } 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 148private: 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; } 171public: 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 190class 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 225class 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 244