os_aix.hpp revision 9665:ce87b1141c12
1/* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2013, 2015 SAP AG. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26#ifndef OS_AIX_VM_OS_AIX_HPP 27#define OS_AIX_VM_OS_AIX_HPP 28 29// Information about the protection of the page at address '0' on this os. 30static bool zero_page_read_protected() { return false; } 31 32// Class Aix defines the interface to the Aix operating systems. 33 34class Aix { 35 friend class os; 36 37 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 38 // __sigaction(), signal() is loaded 39 static struct sigaction *(*get_signal_action)(int); 40 static struct sigaction *get_preinstalled_handler(int); 41 static void save_preinstalled_handler(int, struct sigaction&); 42 43 static void check_signal_handler(int sig); 44 45 private: 46 47 static julong _physical_memory; 48 static pthread_t _main_thread; 49 static Mutex* _createThread_lock; 50 static int _page_size; 51 52 // Page size of newly created pthreads. 53 static int _stack_page_size; 54 55 // -1 = uninitialized, 0 = AIX, 1 = OS/400 (PASE) 56 static int _on_pase; 57 58 // -1 = uninitialized, otherwise 16 bit number: 59 // lower 8 bit - minor version 60 // higher 8 bit - major version 61 // For AIX, e.g. 0x0601 for AIX 6.1 62 // for OS/400 e.g. 0x0504 for OS/400 V5R4 63 static int _os_version; 64 65 // 4 Byte kernel version: Version, Release, Tech Level, Service Pack. 66 static unsigned int _os_kernel_version; 67 68 // -1 = uninitialized, 69 // 0 - SPEC1170 not requested (XPG_SUS_ENV is OFF or not set) 70 // 1 - SPEC1170 requested (XPG_SUS_ENV is ON) 71 static int _xpg_sus_mode; 72 73 // -1 = uninitialized, 74 // 0 - EXTSHM=OFF or not set 75 // 1 - EXTSHM=ON 76 static int _extshm; 77 78 static julong available_memory(); 79 static julong physical_memory() { return _physical_memory; } 80 static void initialize_system_info(); 81 82 // OS recognitions (PASE/AIX, OS level) call this before calling any 83 // one of Aix::on_pase(), Aix::os_version(). 84 static void initialize_os_info(); 85 86 // Scan environment for important settings which might effect the 87 // VM. Trace out settings. Warn about invalid settings and/or 88 // correct them. 89 // 90 // Must run after os::Aix::initialue_os_info(). 91 static void scan_environment(); 92 93 // Initialize libo4 (on PASE) and libperfstat (on AIX). Call this 94 // before relying on functions from either lib, e.g. Aix::get_meminfo(). 95 static void initialize_libo4(); 96 static void initialize_libperfstat(); 97 98 public: 99 static void init_thread_fpu_state(); 100 static pthread_t main_thread(void) { return _main_thread; } 101 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 102 static Mutex* createThread_lock(void) { return _createThread_lock; } 103 static void hotspot_sigmask(Thread* thread); 104 105 // Given an address, returns the size of the page backing that address 106 static size_t query_pagesize(void* p); 107 108 // Return `true' if the calling thread is the primordial thread. The 109 // primordial thread is the thread which contains the main function, 110 // *not* necessarily the thread which initialized the VM by calling 111 // JNI_CreateJavaVM. 112 static bool is_primordial_thread(void); 113 114 static int page_size(void) { 115 assert(_page_size != -1, "not initialized"); 116 return _page_size; 117 } 118 119 // Accessor methods for stack page size which may be different from usual page size. 120 static int stack_page_size(void) { 121 assert(_stack_page_size != -1, "not initialized"); 122 return _stack_page_size; 123 } 124 125 // This is used to scale stack space (guard pages etc.). The name is somehow misleading. 126 static int vm_default_page_size(void ) { return 8*K; } 127 128 static address ucontext_get_pc(const ucontext_t* uc); 129 static intptr_t* ucontext_get_sp(ucontext_t* uc); 130 static intptr_t* ucontext_get_fp(ucontext_t* uc); 131 // Set PC into context. Needed for continuation after signal. 132 static void ucontext_set_pc(ucontext_t* uc, address pc); 133 134 // This boolean allows users to forward their own non-matching signals 135 // to JVM_handle_aix_signal, harmlessly. 136 static bool signal_handlers_are_installed; 137 138 static int get_our_sigflags(int); 139 static void set_our_sigflags(int, int); 140 static void signal_sets_init(); 141 static void install_signal_handlers(); 142 static void set_signal_handler(int, bool); 143 static bool is_sig_ignored(int sig); 144 145 static sigset_t* unblocked_signals(); 146 static sigset_t* vm_signals(); 147 static sigset_t* allowdebug_blocked_signals(); 148 149 // For signal-chaining 150 static struct sigaction *get_chained_signal_action(int sig); 151 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 152 153 // libpthread version string 154 static void libpthread_init(); 155 156 // Minimum stack size a thread can be created with (allowing 157 // the VM to completely create the thread and enter user code) 158 static size_t min_stack_allowed; 159 160 // Return default stack size or guard size for the specified thread type 161 static size_t default_stack_size(os::ThreadType thr_type); 162 static size_t default_guard_size(os::ThreadType thr_type); 163 164 // Function returns true if we run on OS/400 (pase), false if we run 165 // on AIX. 166 static bool on_pase() { 167 assert(_on_pase != -1, "not initialized"); 168 return _on_pase ? true : false; 169 } 170 171 // Function returns true if we run on AIX, false if we run on OS/400 172 // (pase). 173 static bool on_aix() { 174 assert(_on_pase != -1, "not initialized"); 175 return _on_pase ? false : true; 176 } 177 178 // -1 = uninitialized, otherwise 16 bit number: 179 // lower 8 bit - minor version 180 // higher 8 bit - major version 181 // For AIX, e.g. 0x0601 for AIX 6.1 182 // for OS/400 e.g. 0x0504 for OS/400 V5R4 183 static int os_version () { 184 assert(_os_version != -1, "not initialized"); 185 return _os_version; 186 } 187 188 // Get 4 byte AIX kernel version number: 189 // highest 2 bytes: Version, Release 190 // if available: lowest 2 bytes: Tech Level, Service Pack. 191 static unsigned int os_kernel_version() { 192 if (_os_kernel_version) return _os_kernel_version; 193 return os_version() << 16; 194 } 195 196 // Convenience method: returns true if running on PASE V5R4 or older. 197 static bool on_pase_V5R4_or_older() { 198 return on_pase() && os_version() <= 0x0504; 199 } 200 201 // Convenience method: returns true if running on AIX 5.3 or older. 202 static bool on_aix_53_or_older() { 203 return on_aix() && os_version() <= 0x0503; 204 } 205 206 // Returns true if we run in SPEC1170 compliant mode (XPG_SUS_ENV=ON). 207 static bool xpg_sus_mode() { 208 assert(_xpg_sus_mode != -1, "not initialized"); 209 return _xpg_sus_mode; 210 } 211 212 // Returns true if EXTSHM=ON. 213 static bool extshm() { 214 assert(_extshm != -1, "not initialized"); 215 return _extshm; 216 } 217 218 // result struct for get_meminfo() 219 struct meminfo_t { 220 221 // Amount of virtual memory (in units of 4 KB pages) 222 unsigned long long virt_total; 223 224 // Amount of real memory, in bytes 225 unsigned long long real_total; 226 227 // Amount of free real memory, in bytes 228 unsigned long long real_free; 229 230 // Total amount of paging space, in bytes 231 unsigned long long pgsp_total; 232 233 // Amount of free paging space, in bytes 234 unsigned long long pgsp_free; 235 236 }; 237 238 // Functions to retrieve memory information on AIX, PASE. 239 // (on AIX, using libperfstat, on PASE with libo4.so). 240 // Returns true if ok, false if error. 241 static bool get_meminfo(meminfo_t* pmi); 242 243}; 244 245 246class PlatformEvent : public CHeapObj<mtInternal> { 247 private: 248 double CachePad [4]; // increase odds that _mutex is sole occupant of cache line 249 volatile int _Event; 250 volatile int _nParked; 251 pthread_mutex_t _mutex [1]; 252 pthread_cond_t _cond [1]; 253 double PostPad [2]; 254 Thread * _Assoc; 255 256 public: // TODO-FIXME: make dtor private 257 ~PlatformEvent() { guarantee (0, "invariant"); } 258 259 public: 260 PlatformEvent() { 261 int status; 262 status = pthread_cond_init (_cond, NULL); 263 assert_status(status == 0, status, "cond_init"); 264 status = pthread_mutex_init (_mutex, NULL); 265 assert_status(status == 0, status, "mutex_init"); 266 _Event = 0; 267 _nParked = 0; 268 _Assoc = NULL; 269 } 270 271 // Use caution with reset() and fired() -- they may require MEMBARs 272 void reset() { _Event = 0; } 273 int fired() { return _Event; } 274 void park (); 275 void unpark (); 276 int TryPark (); 277 int park (jlong millis); 278 void SetAssociation (Thread * a) { _Assoc = a; } 279}; 280 281class PlatformParker : public CHeapObj<mtInternal> { 282 protected: 283 pthread_mutex_t _mutex [1]; 284 pthread_cond_t _cond [1]; 285 286 public: // TODO-FIXME: make dtor private 287 ~PlatformParker() { guarantee (0, "invariant"); } 288 289 public: 290 PlatformParker() { 291 int status; 292 status = pthread_cond_init (_cond, NULL); 293 assert_status(status == 0, status, "cond_init"); 294 status = pthread_mutex_init (_mutex, NULL); 295 assert_status(status == 0, status, "mutex_init"); 296 } 297}; 298 299#endif // OS_AIX_VM_OS_AIX_HPP 300