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3960
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1 /*
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef OS_BSD_VM_OS_BSD_HPP
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26 #define OS_BSD_VM_OS_BSD_HPP
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27
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28 // Bsd_OS defines the interface to Bsd operating systems
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29
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30 /* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
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31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
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32
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33 #ifdef __APPLE__
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34 // Mac OS X doesn't support clock_gettime. Stub out the type, it is
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35 // unused
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36 typedef int clockid_t;
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37 #endif
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38
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39 class Bsd {
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40 friend class os;
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41
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42 // For signal-chaining
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43 #define MAXSIGNUM 32
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44 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
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45 static unsigned int sigs; // mask of signals that have
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46 // preinstalled signal handlers
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47 static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
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48 // __sigaction(), signal() is loaded
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49 static struct sigaction *(*get_signal_action)(int);
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50 static struct sigaction *get_preinstalled_handler(int);
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51 static void save_preinstalled_handler(int, struct sigaction&);
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52
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53 static void check_signal_handler(int sig);
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54
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55 // For signal flags diagnostics
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56 static int sigflags[MAXSIGNUM];
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57
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58 static int (*_clock_gettime)(clockid_t, struct timespec *);
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59 #ifndef _ALLBSD_SOURCE
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60 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
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61
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62 static address _initial_thread_stack_bottom;
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63 static uintptr_t _initial_thread_stack_size;
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64
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65 static const char *_glibc_version;
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66 static const char *_libpthread_version;
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67
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68 static bool _is_floating_stack;
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69 static bool _is_NPTL;
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70 static bool _supports_fast_thread_cpu_time;
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71 #endif
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72
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73 static GrowableArray<int>* _cpu_to_node;
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74
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75 protected:
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76
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77 static julong _physical_memory;
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78 static pthread_t _main_thread;
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79 #ifndef _ALLBSD_SOURCE
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80 static Mutex* _createThread_lock;
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81 #endif
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82 static int _page_size;
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83
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84 static julong available_memory();
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85 static julong physical_memory() { return _physical_memory; }
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86 static void initialize_system_info();
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87
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88 #ifndef _ALLBSD_SOURCE
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89 static void set_glibc_version(const char *s) { _glibc_version = s; }
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90 static void set_libpthread_version(const char *s) { _libpthread_version = s; }
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91 #endif
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92
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93 static bool supports_variable_stack_size();
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94
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95 #ifndef _ALLBSD_SOURCE
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96 static void set_is_NPTL() { _is_NPTL = true; }
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97 static void set_is_BsdThreads() { _is_NPTL = false; }
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98 static void set_is_floating_stack() { _is_floating_stack = true; }
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99 #endif
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100
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101 static void rebuild_cpu_to_node_map();
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102 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
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103
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104 static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
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105
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106 public:
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107
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108 static void init_thread_fpu_state();
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109 #ifndef _ALLBSD_SOURCE
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110 static int get_fpu_control_word();
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111 static void set_fpu_control_word(int fpu_control);
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112 #endif
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113 static pthread_t main_thread(void) { return _main_thread; }
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114
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115 #ifndef _ALLBSD_SOURCE
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116 // returns kernel thread id (similar to LWP id on Solaris), which can be
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117 // used to access /proc
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118 static pid_t gettid();
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119 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
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120 static Mutex* createThread_lock(void) { return _createThread_lock; }
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121 #endif
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122 static void hotspot_sigmask(Thread* thread);
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123
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124 #ifndef _ALLBSD_SOURCE
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125 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
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126 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
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127 #endif
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128 static bool is_initial_thread(void);
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129
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130 static int page_size(void) { return _page_size; }
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131 static void set_page_size(int val) { _page_size = val; }
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132
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133 static address ucontext_get_pc(ucontext_t* uc);
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134 static intptr_t* ucontext_get_sp(ucontext_t* uc);
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135 static intptr_t* ucontext_get_fp(ucontext_t* uc);
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136
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137 // For Analyzer Forte AsyncGetCallTrace profiling support:
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138 //
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139 // This interface should be declared in os_bsd_i486.hpp, but
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140 // that file provides extensions to the os class and not the
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141 // Bsd class.
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142 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
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143 intptr_t** ret_sp, intptr_t** ret_fp);
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144
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145 // This boolean allows users to forward their own non-matching signals
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146 // to JVM_handle_bsd_signal, harmlessly.
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147 static bool signal_handlers_are_installed;
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148
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149 static int get_our_sigflags(int);
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150 static void set_our_sigflags(int, int);
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151 static void signal_sets_init();
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152 static void install_signal_handlers();
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153 static void set_signal_handler(int, bool);
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154 static bool is_sig_ignored(int sig);
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155
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156 static sigset_t* unblocked_signals();
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157 static sigset_t* vm_signals();
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158 static sigset_t* allowdebug_blocked_signals();
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159
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160 // For signal-chaining
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161 static struct sigaction *get_chained_signal_action(int sig);
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162 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
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163
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164 #ifndef _ALLBSD_SOURCE
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165 // GNU libc and libpthread version strings
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166 static const char *glibc_version() { return _glibc_version; }
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167 static const char *libpthread_version() { return _libpthread_version; }
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168
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169 // NPTL or BsdThreads?
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170 static bool is_BsdThreads() { return !_is_NPTL; }
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171 static bool is_NPTL() { return _is_NPTL; }
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172
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173 // NPTL is always floating stack. BsdThreads could be using floating
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174 // stack or fixed stack.
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175 static bool is_floating_stack() { return _is_floating_stack; }
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176
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177 static void libpthread_init();
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178 static bool libnuma_init();
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179 static void* libnuma_dlsym(void* handle, const char* name);
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180 #endif
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181 // Minimum stack size a thread can be created with (allowing
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182 // the VM to completely create the thread and enter user code)
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183 static size_t min_stack_allowed;
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184
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185 // Return default stack size or guard size for the specified thread type
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186 static size_t default_stack_size(os::ThreadType thr_type);
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187 static size_t default_guard_size(os::ThreadType thr_type);
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188
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189 #ifndef _ALLBSD_SOURCE
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190 static void capture_initial_stack(size_t max_size);
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191
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192 // Stack overflow handling
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193 static bool manually_expand_stack(JavaThread * t, address addr);
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194 static int max_register_window_saves_before_flushing();
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195 #endif
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196
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197 // Real-time clock functions
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198 static void clock_init(void);
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199
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200 #ifndef _ALLBSD_SOURCE
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201 // fast POSIX clocks support
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202 static void fast_thread_clock_init(void);
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203 #endif
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204
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205 static bool supports_monotonic_clock() {
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206 return _clock_gettime != NULL;
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207 }
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208
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209 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
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210 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
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211 }
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212
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213 #ifndef _ALLBSD_SOURCE
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214 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
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215 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
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216 }
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217
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218 static bool supports_fast_thread_cpu_time() {
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219 return _supports_fast_thread_cpu_time;
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220 }
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221
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222 static jlong fast_thread_cpu_time(clockid_t clockid);
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223 #endif
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224
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225 // Stack repair handling
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226
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227 // none present
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228
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229 // BsdThreads work-around for 6292965
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230 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
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231
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232
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233 // Bsd suspend/resume support - this helper is a shadow of its former
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234 // self now that low-level suspension is barely used, and old workarounds
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235 // for BsdThreads are no longer needed.
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236 class SuspendResume {
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237 private:
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238 volatile int _suspend_action;
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239 // values for suspend_action:
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240 #define SR_NONE (0x00)
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241 #define SR_SUSPEND (0x01) // suspend request
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242 #define SR_CONTINUE (0x02) // resume request
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243
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244 volatile jint _state;
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245 // values for _state: + SR_NONE
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246 #define SR_SUSPENDED (0x20)
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247 public:
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248 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
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249
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250 int suspend_action() const { return _suspend_action; }
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251 void set_suspend_action(int x) { _suspend_action = x; }
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252
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253 // atomic updates for _state
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254 void set_suspended() {
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255 jint temp, temp2;
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256 do {
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257 temp = _state;
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258 temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp);
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259 } while (temp2 != temp);
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260 }
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261 void clear_suspended() {
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262 jint temp, temp2;
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263 do {
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264 temp = _state;
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265 temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp);
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266 } while (temp2 != temp);
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267 }
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268 bool is_suspended() { return _state & SR_SUSPENDED; }
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269
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270 #undef SR_SUSPENDED
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271 };
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272
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273 private:
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274 typedef int (*sched_getcpu_func_t)(void);
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275 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
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276 typedef int (*numa_max_node_func_t)(void);
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277 typedef int (*numa_available_func_t)(void);
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278 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
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279 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
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280
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281 static sched_getcpu_func_t _sched_getcpu;
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282 static numa_node_to_cpus_func_t _numa_node_to_cpus;
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283 static numa_max_node_func_t _numa_max_node;
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284 static numa_available_func_t _numa_available;
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285 static numa_tonode_memory_func_t _numa_tonode_memory;
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286 static numa_interleave_memory_func_t _numa_interleave_memory;
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287 static unsigned long* _numa_all_nodes;
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288
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289 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
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290 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
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291 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
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292 static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
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293 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
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294 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
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295 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
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296 public:
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297 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
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298 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
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299 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
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300 }
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301 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
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302 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
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303 static int numa_tonode_memory(void *start, size_t size, int node) {
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304 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
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305 }
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306 static void numa_interleave_memory(void *start, size_t size) {
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307 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
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308 _numa_interleave_memory(start, size, _numa_all_nodes);
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309 }
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310 }
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311 static int get_node_by_cpu(int cpu_id);
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312 };
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313
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314
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6197
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315 class PlatformEvent : public CHeapObj<mtInternal> {
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3960
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316 private:
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317 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
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318 volatile int _Event ;
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319 volatile int _nParked ;
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320 pthread_mutex_t _mutex [1] ;
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321 pthread_cond_t _cond [1] ;
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322 double PostPad [2] ;
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323 Thread * _Assoc ;
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324
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325 public: // TODO-FIXME: make dtor private
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326 ~PlatformEvent() { guarantee (0, "invariant") ; }
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327
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328 public:
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329 PlatformEvent() {
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330 int status;
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331 status = pthread_cond_init (_cond, NULL);
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332 assert_status(status == 0, status, "cond_init");
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333 status = pthread_mutex_init (_mutex, NULL);
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334 assert_status(status == 0, status, "mutex_init");
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335 _Event = 0 ;
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336 _nParked = 0 ;
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337 _Assoc = NULL ;
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338 }
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339
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340 // Use caution with reset() and fired() -- they may require MEMBARs
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341 void reset() { _Event = 0 ; }
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342 int fired() { return _Event; }
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343 void park () ;
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344 void unpark () ;
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345 int TryPark () ;
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346 int park (jlong millis) ;
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347 void SetAssociation (Thread * a) { _Assoc = a ; }
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348 } ;
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349
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6197
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350 class PlatformParker : public CHeapObj<mtInternal> {
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3960
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351 protected:
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352 pthread_mutex_t _mutex [1] ;
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353 pthread_cond_t _cond [1] ;
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354
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355 public: // TODO-FIXME: make dtor private
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356 ~PlatformParker() { guarantee (0, "invariant") ; }
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357
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358 public:
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359 PlatformParker() {
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360 int status;
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361 status = pthread_cond_init (_cond, NULL);
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362 assert_status(status == 0, status, "cond_init");
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363 status = pthread_mutex_init (_mutex, NULL);
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364 assert_status(status == 0, status, "mutex_init");
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365 }
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366 } ;
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367
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368 #endif // OS_BSD_VM_OS_BSD_HPP
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