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1 /*
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2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Linux_OS defines the interface to Linux operating systems
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26
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27 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
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28 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
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29
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30 class Linux {
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31 friend class os;
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32
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33 // For signal-chaining
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34 #define MAXSIGNUM 32
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35 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
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36 static unsigned int sigs; // mask of signals that have
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37 // preinstalled signal handlers
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38 static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
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39 // __sigaction(), signal() is loaded
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40 static struct sigaction *(*get_signal_action)(int);
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41 static struct sigaction *get_preinstalled_handler(int);
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42 static void save_preinstalled_handler(int, struct sigaction&);
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43
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44 static void check_signal_handler(int sig);
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45
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46 // For signal flags diagnostics
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47 static int sigflags[MAXSIGNUM];
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48
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49 static int (*_clock_gettime)(clockid_t, struct timespec *);
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50 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
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51
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52 static address _initial_thread_stack_bottom;
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53 static uintptr_t _initial_thread_stack_size;
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54
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55 static char *_glibc_version;
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56 static char *_libpthread_version;
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57
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58 static bool _is_floating_stack;
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59 static bool _is_NPTL;
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60 static bool _supports_fast_thread_cpu_time;
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61
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62 protected:
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63
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64 static julong _physical_memory;
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65 static pthread_t _main_thread;
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66 static Mutex* _createThread_lock;
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67 static int _page_size;
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68
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69 static julong available_memory();
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70 static julong physical_memory() { return _physical_memory; }
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71 static void initialize_system_info();
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72
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73 static void set_glibc_version(char *s) { _glibc_version = s; }
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74 static void set_libpthread_version(char *s) { _libpthread_version = s; }
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75
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76 static bool supports_variable_stack_size();
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77
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78 static void set_is_NPTL() { _is_NPTL = true; }
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79 static void set_is_LinuxThreads() { _is_NPTL = false; }
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80 static void set_is_floating_stack() { _is_floating_stack = true; }
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81
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82 public:
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83
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84 static void init_thread_fpu_state();
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85 static int get_fpu_control_word();
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86 static void set_fpu_control_word(int fpu_control);
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87 static pthread_t main_thread(void) { return _main_thread; }
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88 // returns kernel thread id (similar to LWP id on Solaris), which can be
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89 // used to access /proc
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90 static pid_t gettid();
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91 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
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92 static Mutex* createThread_lock(void) { return _createThread_lock; }
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93 static void hotspot_sigmask(Thread* thread);
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94
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95 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
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96 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
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97 static bool is_initial_thread(void);
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98
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99 static int page_size(void) { return _page_size; }
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100 static void set_page_size(int val) { _page_size = val; }
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101
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102 static address ucontext_get_pc(ucontext_t* uc);
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103 static intptr_t* ucontext_get_sp(ucontext_t* uc);
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104 static intptr_t* ucontext_get_fp(ucontext_t* uc);
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105
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106 // For Analyzer Forte AsyncGetCallTrace profiling support:
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107 //
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108 // This interface should be declared in os_linux_i486.hpp, but
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109 // that file provides extensions to the os class and not the
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110 // Linux class.
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111 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
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112 intptr_t** ret_sp, intptr_t** ret_fp);
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113
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114 // This boolean allows users to forward their own non-matching signals
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115 // to JVM_handle_linux_signal, harmlessly.
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116 static bool signal_handlers_are_installed;
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117
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118 static int get_our_sigflags(int);
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119 static void set_our_sigflags(int, int);
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120 static void signal_sets_init();
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121 static void install_signal_handlers();
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122 static void set_signal_handler(int, bool);
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123 static bool is_sig_ignored(int sig);
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124
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125 static sigset_t* unblocked_signals();
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126 static sigset_t* vm_signals();
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127 static sigset_t* allowdebug_blocked_signals();
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128
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129 // For signal-chaining
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130 static struct sigaction *get_chained_signal_action(int sig);
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131 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
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132
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133 // GNU libc and libpthread version strings
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134 static char *glibc_version() { return _glibc_version; }
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135 static char *libpthread_version() { return _libpthread_version; }
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136
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137 // NPTL or LinuxThreads?
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138 static bool is_LinuxThreads() { return !_is_NPTL; }
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139 static bool is_NPTL() { return _is_NPTL; }
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140
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141 // NPTL is always floating stack. LinuxThreads could be using floating
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142 // stack or fixed stack.
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143 static bool is_floating_stack() { return _is_floating_stack; }
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144
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145 static void libpthread_init();
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146
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147 // Minimum stack size a thread can be created with (allowing
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148 // the VM to completely create the thread and enter user code)
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149 static size_t min_stack_allowed;
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150
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151 // Return default stack size or guard size for the specified thread type
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152 static size_t default_stack_size(os::ThreadType thr_type);
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153 static size_t default_guard_size(os::ThreadType thr_type);
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154
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155 static void capture_initial_stack(size_t max_size);
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156
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157 // Stack overflow handling
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158 static bool manually_expand_stack(JavaThread * t, address addr);
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159 static int max_register_window_saves_before_flushing();
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160
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161 // Real-time clock functions
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162 static void clock_init(void);
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163
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164 // fast POSIX clocks support
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165 static void fast_thread_clock_init(void);
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166
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167 static bool supports_monotonic_clock() {
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168 return _clock_gettime != NULL;
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169 }
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170
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171 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
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172 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
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173 }
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174
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175 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
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176 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
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177 }
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178
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179 static bool supports_fast_thread_cpu_time() {
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180 return _supports_fast_thread_cpu_time;
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181 }
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182
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183 static jlong fast_thread_cpu_time(clockid_t clockid);
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184
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185 // Stack repair handling
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186
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187 // none present
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188
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189 // LinuxThreads work-around for 6292965
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190 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
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191
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192
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193 // Linux suspend/resume support - this helper is a shadow of its former
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194 // self now that low-level suspension is barely used, and old workarounds
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195 // for LinuxThreads are no longer needed.
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196 class SuspendResume {
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197 private:
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198 volatile int _suspend_action;
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199 // values for suspend_action:
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200 #define SR_NONE (0x00)
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201 #define SR_SUSPEND (0x01) // suspend request
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202 #define SR_CONTINUE (0x02) // resume request
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203
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204 volatile jint _state;
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205 // values for _state: + SR_NONE
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206 #define SR_SUSPENDED (0x20)
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207 public:
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208 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
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209
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210 int suspend_action() const { return _suspend_action; }
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211 void set_suspend_action(int x) { _suspend_action = x; }
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212
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213 // atomic updates for _state
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214 void set_suspended() {
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215 jint temp, temp2;
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216 do {
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217 temp = _state;
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218 temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp);
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219 } while (temp2 != temp);
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220 }
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221 void clear_suspended() {
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222 jint temp, temp2;
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223 do {
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224 temp = _state;
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225 temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp);
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226 } while (temp2 != temp);
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227 }
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228 bool is_suspended() { return _state & SR_SUSPENDED; }
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229
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230 #undef SR_SUSPENDED
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231 };
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232 };
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233
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234
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235 class PlatformEvent : public CHeapObj {
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236 private:
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237 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
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238 volatile int _Event ;
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239 volatile int _nParked ;
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240 pthread_mutex_t _mutex [1] ;
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241 pthread_cond_t _cond [1] ;
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242 double PostPad [2] ;
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243 Thread * _Assoc ;
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244
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245 public: // TODO-FIXME: make dtor private
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246 ~PlatformEvent() { guarantee (0, "invariant") ; }
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247
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248 public:
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249 PlatformEvent() {
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250 int status;
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251 status = pthread_cond_init (_cond, NULL);
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252 assert_status(status == 0, status, "cond_init");
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253 status = pthread_mutex_init (_mutex, NULL);
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254 assert_status(status == 0, status, "mutex_init");
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255 _Event = 0 ;
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256 _nParked = 0 ;
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257 _Assoc = NULL ;
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258 }
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259
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260 // Use caution with reset() and fired() -- they may require MEMBARs
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261 void reset() { _Event = 0 ; }
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262 int fired() { return _Event; }
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263 void park () ;
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264 void unpark () ;
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265 int TryPark () ;
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266 int park (jlong millis) ;
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267 void SetAssociation (Thread * a) { _Assoc = a ; }
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268 } ;
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269
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270 class PlatformParker : public CHeapObj {
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271 protected:
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272 pthread_mutex_t _mutex [1] ;
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273 pthread_cond_t _cond [1] ;
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274
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275 public: // TODO-FIXME: make dtor private
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276 ~PlatformParker() { guarantee (0, "invariant") ; }
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277
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278 public:
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279 PlatformParker() {
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280 int status;
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281 status = pthread_cond_init (_cond, NULL);
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282 assert_status(status == 0, status, "cond_init");
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283 status = pthread_mutex_init (_mutex, NULL);
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284 assert_status(status == 0, status, "mutex_init");
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285 }
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286 } ;
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