1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2020 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // kernel/startup.cfa -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Thu Jul 30 15:12:54 2020 |
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11 | // Last Modified By : |
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12 | // Last Modified On : |
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13 | // Update Count : |
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14 | // |
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15 | |
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16 | #define __cforall_thread__ |
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17 | |
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18 | // C Includes |
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19 | #include <errno.h> // errno |
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20 | #include <string.h> // strerror |
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21 | #include <unistd.h> // sysconf |
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22 | extern "C" { |
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23 | #include <limits.h> // PTHREAD_STACK_MIN |
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24 | #include <sys/mman.h> // mprotect |
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25 | #include <sys/resource.h> // getrlimit |
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26 | } |
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27 | |
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28 | // CFA Includes |
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29 | #include "kernel_private.hfa" |
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30 | #include "startup.hfa" // STARTUP_PRIORITY_XXX |
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31 | |
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32 | //----------------------------------------------------------------------------- |
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33 | // Some assembly required |
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34 | #if defined( __i386 ) |
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35 | #define CtxGet( ctx ) \ |
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36 | __asm__ volatile ( \ |
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37 | "movl %%esp,%0\n"\ |
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38 | "movl %%ebp,%1\n"\ |
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39 | : "=rm" (ctx.SP),\ |
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40 | "=rm" (ctx.FP) \ |
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41 | ) |
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42 | #elif defined( __x86_64 ) |
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43 | #define CtxGet( ctx ) \ |
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44 | __asm__ volatile ( \ |
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45 | "movq %%rsp,%0\n"\ |
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46 | "movq %%rbp,%1\n"\ |
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47 | : "=rm" (ctx.SP),\ |
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48 | "=rm" (ctx.FP) \ |
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49 | ) |
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50 | #elif defined( __ARM_ARCH ) |
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51 | #define CtxGet( ctx ) __asm__ ( \ |
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52 | "mov %0,%%sp\n" \ |
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53 | "mov %1,%%r11\n" \ |
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54 | : "=rm" (ctx.SP), "=rm" (ctx.FP) ) |
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55 | #else |
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56 | #error unknown hardware architecture |
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57 | #endif |
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58 | |
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59 | //----------------------------------------------------------------------------- |
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60 | // Start and stop routine for the kernel, declared first to make sure they run first |
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61 | static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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62 | static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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63 | |
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64 | //----------------------------------------------------------------------------- |
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65 | // Static Forward Declarations |
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66 | struct current_stack_info_t; |
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67 | |
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68 | static void * __invoke_processor(void * arg); |
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69 | static void __kernel_first_resume( processor * this ); |
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70 | static void __kernel_last_resume ( processor * this ); |
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71 | static void init(processor & this, const char name[], cluster & _cltr); |
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72 | static void deinit(processor & this); |
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73 | static void doregister( struct cluster & cltr ); |
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74 | static void unregister( struct cluster & cltr ); |
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75 | static void ?{}( $coroutine & this, current_stack_info_t * info); |
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76 | static void ?{}( $thread & this, current_stack_info_t * info); |
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77 | static void ?{}(processorCtx_t & this) {} |
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78 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info); |
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79 | |
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80 | //----------------------------------------------------------------------------- |
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81 | // Forward Declarations for other modules |
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82 | extern void __kernel_alarm_startup(void); |
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83 | extern void __kernel_alarm_shutdown(void); |
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84 | extern void __kernel_io_startup (void); |
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85 | extern void __kernel_io_shutdown(void); |
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86 | |
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87 | //----------------------------------------------------------------------------- |
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88 | // Other Forward Declarations |
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89 | extern void __wake_proc(processor *); |
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90 | |
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91 | //----------------------------------------------------------------------------- |
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92 | // Kernel storage |
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93 | KERNEL_STORAGE(cluster, mainCluster); |
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94 | KERNEL_STORAGE(processor, mainProcessor); |
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95 | KERNEL_STORAGE($thread, mainThread); |
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96 | KERNEL_STORAGE(__stack_t, mainThreadCtx); |
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97 | KERNEL_STORAGE(io_context, mainPollerThread); |
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98 | KERNEL_STORAGE(__scheduler_RWLock_t, __scheduler_lock); |
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99 | #if !defined(__CFA_NO_STATISTICS__) |
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100 | KERNEL_STORAGE(__stats_t, mainProcStats); |
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101 | #endif |
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102 | |
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103 | cluster * mainCluster; |
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104 | processor * mainProcessor; |
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105 | $thread * mainThread; |
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106 | __scheduler_RWLock_t * __scheduler_lock; |
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107 | |
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108 | extern "C" { |
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109 | struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters; |
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110 | } |
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111 | |
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112 | size_t __page_size = 0; |
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113 | |
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114 | //----------------------------------------------------------------------------- |
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115 | // Global state |
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116 | thread_local struct KernelThreadData kernelTLS __attribute__ ((tls_model ( "initial-exec" ))) @= { |
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117 | NULL, // cannot use 0p |
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118 | NULL, |
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119 | NULL, |
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120 | { 1, false, false }, |
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121 | }; |
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122 | |
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123 | //----------------------------------------------------------------------------- |
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124 | // Struct to steal stack |
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125 | struct current_stack_info_t { |
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126 | __stack_t * storage; // pointer to stack object |
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127 | void * base; // base of stack |
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128 | void * limit; // stack grows towards stack limit |
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129 | void * context; // address of cfa_context_t |
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130 | }; |
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131 | |
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132 | void ?{}( current_stack_info_t & this ) { |
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133 | __stack_context_t ctx; |
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134 | CtxGet( ctx ); |
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135 | this.base = ctx.FP; |
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136 | |
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137 | rlimit r; |
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138 | getrlimit( RLIMIT_STACK, &r); |
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139 | size_t size = r.rlim_cur; |
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140 | |
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141 | this.limit = (void *)(((intptr_t)this.base) - size); |
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142 | this.context = &storage_mainThreadCtx; |
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143 | } |
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144 | |
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145 | |
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146 | |
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147 | //============================================================================================= |
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148 | // Kernel Setup logic |
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149 | //============================================================================================= |
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150 | //----------------------------------------------------------------------------- |
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151 | // Kernel boot procedures |
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152 | static void __kernel_startup(void) { |
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153 | verify( ! kernelTLS.preemption_state.enabled ); |
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154 | __cfadbg_print_safe(runtime_core, "Kernel : Starting\n"); |
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155 | |
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156 | __page_size = sysconf( _SC_PAGESIZE ); |
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157 | |
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158 | __cfa_dbg_global_clusters.list{ __get }; |
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159 | __cfa_dbg_global_clusters.lock{}; |
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160 | |
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161 | // Initialize the global scheduler lock |
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162 | __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock; |
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163 | (*__scheduler_lock){}; |
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164 | |
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165 | // Initialize the main cluster |
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166 | mainCluster = (cluster *)&storage_mainCluster; |
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167 | (*mainCluster){"Main Cluster", 0}; |
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168 | |
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169 | __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n"); |
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170 | |
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171 | // Start by initializing the main thread |
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172 | // SKULLDUGGERY: the mainThread steals the process main thread |
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173 | // which will then be scheduled by the mainProcessor normally |
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174 | mainThread = ($thread *)&storage_mainThread; |
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175 | current_stack_info_t info; |
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176 | info.storage = (__stack_t*)&storage_mainThreadCtx; |
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177 | (*mainThread){ &info }; |
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178 | |
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179 | __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n"); |
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180 | |
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181 | |
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182 | |
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183 | // Construct the processor context of the main processor |
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184 | void ?{}(processorCtx_t & this, processor * proc) { |
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185 | (this.__cor){ "Processor" }; |
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186 | this.__cor.starter = 0p; |
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187 | this.proc = proc; |
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188 | } |
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189 | |
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190 | void ?{}(processor & this) with( this ) { |
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191 | ( this.idle ){}; |
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192 | ( this.terminated ){ 0 }; |
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193 | ( this.runner ){}; |
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194 | init( this, "Main Processor", *mainCluster ); |
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195 | kernel_thread = pthread_self(); |
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196 | |
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197 | runner{ &this }; |
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198 | __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner); |
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199 | } |
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200 | |
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201 | // Initialize the main processor and the main processor ctx |
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202 | // (the coroutine that contains the processing control flow) |
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203 | mainProcessor = (processor *)&storage_mainProcessor; |
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204 | (*mainProcessor){}; |
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205 | |
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206 | //initialize the global state variables |
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207 | kernelTLS.this_processor = mainProcessor; |
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208 | kernelTLS.this_thread = mainThread; |
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209 | |
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210 | #if !defined( __CFA_NO_STATISTICS__ ) |
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211 | kernelTLS.this_stats = (__stats_t *)& storage_mainProcStats; |
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212 | __init_stats( kernelTLS.this_stats ); |
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213 | #endif |
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214 | |
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215 | // Enable preemption |
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216 | __kernel_alarm_startup(); |
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217 | |
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218 | // Start IO |
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219 | __kernel_io_startup(); |
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220 | |
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221 | // Add the main thread to the ready queue |
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222 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
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223 | __schedule_thread((__processor_id_t *)mainProcessor, mainThread); |
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224 | |
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225 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
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226 | // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that |
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227 | // mainThread is on the ready queue when this call is made. |
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228 | __kernel_first_resume( kernelTLS.this_processor ); |
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229 | |
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230 | |
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231 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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232 | |
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233 | |
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234 | // SKULLDUGGERY: The constructor for the mainCluster will call alloc with a dimension of 0 |
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235 | // malloc *can* return a non-null value, we should free it if that is the case |
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236 | free( mainCluster->io.ctxs ); |
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237 | |
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238 | // Now that the system is up, finish creating systems that need threading |
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239 | mainCluster->io.ctxs = (io_context *)&storage_mainPollerThread; |
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240 | mainCluster->io.cnt = 1; |
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241 | (*mainCluster->io.ctxs){ *mainCluster }; |
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242 | |
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243 | __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n"); |
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244 | |
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245 | verify( ! kernelTLS.preemption_state.enabled ); |
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246 | enable_interrupts( __cfaabi_dbg_ctx ); |
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247 | verify( TL_GET( preemption_state.enabled ) ); |
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248 | } |
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249 | |
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250 | static void __kernel_shutdown(void) { |
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251 | //Before we start shutting things down, wait for systems that need threading to shutdown |
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252 | ^(*mainCluster->io.ctxs){}; |
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253 | mainCluster->io.cnt = 0; |
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254 | mainCluster->io.ctxs = 0p; |
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255 | |
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256 | /* paranoid */ verify( TL_GET( preemption_state.enabled ) ); |
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257 | disable_interrupts(); |
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258 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
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259 | |
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260 | __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n"); |
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261 | |
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262 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
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263 | // When its coroutine terminates, it return control to the mainThread |
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264 | // which is currently here |
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265 | __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE); |
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266 | __kernel_last_resume( kernelTLS.this_processor ); |
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267 | mainThread->self_cor.state = Halted; |
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268 | |
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269 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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270 | |
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271 | // Disable preemption |
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272 | __kernel_alarm_shutdown(); |
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273 | |
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274 | // Stop IO |
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275 | __kernel_io_shutdown(); |
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276 | |
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277 | // Destroy the main processor and its context in reverse order of construction |
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278 | // These were manually constructed so we need manually destroy them |
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279 | void ^?{}(processor & this) with( this ){ |
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280 | deinit( this ); |
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281 | |
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282 | /* paranoid */ verify( this.do_terminate == true ); |
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283 | __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner); |
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284 | } |
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285 | |
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286 | ^(*mainProcessor){}; |
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287 | |
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288 | // Final step, destroy the main thread since it is no longer needed |
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289 | |
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290 | // Since we provided a stack to this taxk it will not destroy anything |
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291 | /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1)); |
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292 | ^(*mainThread){}; |
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293 | |
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294 | ^(*mainCluster){}; |
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295 | |
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296 | ^(*__scheduler_lock){}; |
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297 | |
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298 | ^(__cfa_dbg_global_clusters.list){}; |
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299 | ^(__cfa_dbg_global_clusters.lock){}; |
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300 | |
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301 | __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n"); |
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302 | } |
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303 | |
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304 | //============================================================================================= |
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305 | // Kernel Initial Scheduling logic |
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306 | //============================================================================================= |
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307 | |
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308 | // Context invoker for processors |
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309 | // This is the entry point for processors (kernel threads) *except* for the main processor |
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310 | // It effectively constructs a coroutine by stealing the pthread stack |
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311 | static void * __invoke_processor(void * arg) { |
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312 | #if !defined( __CFA_NO_STATISTICS__ ) |
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313 | __stats_t local_stats; |
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314 | __init_stats( &local_stats ); |
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315 | kernelTLS.this_stats = &local_stats; |
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316 | #endif |
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317 | |
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318 | processor * proc = (processor *) arg; |
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319 | kernelTLS.this_processor = proc; |
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320 | kernelTLS.this_thread = 0p; |
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321 | kernelTLS.preemption_state.[enabled, disable_count] = [false, 1]; |
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322 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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323 | // which is needed for the 2-step context switch. However, there is no reason |
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324 | // to waste the perfectly valid stack create by pthread. |
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325 | current_stack_info_t info; |
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326 | __stack_t ctx; |
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327 | info.storage = &ctx; |
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328 | (proc->runner){ proc, &info }; |
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329 | |
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330 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage); |
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331 | |
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332 | //Set global state |
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333 | kernelTLS.this_thread = 0p; |
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334 | |
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335 | //We now have a proper context from which to schedule threads |
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336 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
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337 | |
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338 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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339 | // resume it to start it like it normally would, it will just context switch |
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340 | // back to here. Instead directly call the main since we already are on the |
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341 | // appropriate stack. |
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342 | get_coroutine(proc->runner)->state = Active; |
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343 | main( proc->runner ); |
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344 | get_coroutine(proc->runner)->state = Halted; |
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345 | |
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346 | // Main routine of the core returned, the core is now fully terminated |
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347 | __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
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348 | |
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349 | #if !defined(__CFA_NO_STATISTICS__) |
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350 | __tally_stats(proc->cltr->stats, &local_stats); |
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351 | if( 0 != proc->print_stats ) { |
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352 | __print_stats( &local_stats, proc->print_stats, true, proc->name, (void*)proc ); |
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353 | } |
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354 | #endif |
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355 | |
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356 | return 0p; |
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357 | } |
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358 | |
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359 | static void __kernel_first_resume( processor * this ) { |
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360 | $thread * src = mainThread; |
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361 | $coroutine * dst = get_coroutine(this->runner); |
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362 | |
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363 | verify( ! kernelTLS.preemption_state.enabled ); |
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364 | |
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365 | kernelTLS.this_thread->curr_cor = dst; |
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366 | __stack_prepare( &dst->stack, 65000 ); |
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367 | __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine); |
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368 | |
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369 | verify( ! kernelTLS.preemption_state.enabled ); |
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370 | |
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371 | dst->last = &src->self_cor; |
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372 | dst->starter = dst->starter ? dst->starter : &src->self_cor; |
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373 | |
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374 | // make sure the current state is still correct |
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375 | /* paranoid */ verify(src->state == Ready); |
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376 | |
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377 | // context switch to specified coroutine |
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378 | verify( dst->context.SP ); |
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379 | __cfactx_switch( &src->context, &dst->context ); |
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380 | // when __cfactx_switch returns we are back in the src coroutine |
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381 | |
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382 | mainThread->curr_cor = &mainThread->self_cor; |
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383 | |
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384 | // make sure the current state has been update |
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385 | /* paranoid */ verify(src->state == Active); |
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386 | |
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387 | verify( ! kernelTLS.preemption_state.enabled ); |
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388 | } |
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389 | |
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390 | // KERNEL_ONLY |
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391 | static void __kernel_last_resume( processor * this ) { |
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392 | $coroutine * src = &mainThread->self_cor; |
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393 | $coroutine * dst = get_coroutine(this->runner); |
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394 | |
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395 | verify( ! kernelTLS.preemption_state.enabled ); |
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396 | verify( dst->starter == src ); |
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397 | verify( dst->context.SP ); |
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398 | |
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399 | // SKULLDUGGERY in debug the processors check that the |
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400 | // stack is still within the limit of the stack limits after running a thread. |
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401 | // that check doesn't make sense if we context switch to the processor using the |
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402 | // coroutine semantics. Since this is a special case, use the current context |
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403 | // info to populate these fields. |
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404 | __cfaabi_dbg_debug_do( |
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405 | __stack_context_t ctx; |
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406 | CtxGet( ctx ); |
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407 | mainThread->context.SP = ctx.SP; |
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408 | mainThread->context.FP = ctx.FP; |
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409 | ) |
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410 | |
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411 | // context switch to the processor |
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412 | __cfactx_switch( &src->context, &dst->context ); |
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413 | } |
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414 | |
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415 | |
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416 | //============================================================================================= |
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417 | // Kernel Object Constructors logic |
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418 | //============================================================================================= |
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419 | //----------------------------------------------------------------------------- |
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420 | // Main thread construction |
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421 | static void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) { |
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422 | stack.storage = info->storage; |
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423 | with(*stack.storage) { |
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424 | limit = info->limit; |
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425 | base = info->base; |
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426 | } |
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427 | __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage; |
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428 | *istorage |= 0x1; |
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429 | name = "Main Thread"; |
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430 | state = Start; |
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431 | starter = 0p; |
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432 | last = 0p; |
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433 | cancellation = 0p; |
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434 | } |
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435 | |
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436 | static void ?{}( $thread & this, current_stack_info_t * info) with( this ) { |
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437 | ticket = 1; |
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438 | state = Start; |
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439 | self_cor{ info }; |
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440 | curr_cor = &self_cor; |
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441 | curr_cluster = mainCluster; |
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442 | self_mon.owner = &this; |
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443 | self_mon.recursion = 1; |
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444 | self_mon_p = &self_mon; |
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445 | link.next = 0p; |
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446 | link.prev = 0p; |
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447 | |
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448 | node.next = 0p; |
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449 | node.prev = 0p; |
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450 | doregister(curr_cluster, this); |
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451 | |
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452 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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453 | } |
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454 | |
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455 | //----------------------------------------------------------------------------- |
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456 | // Processor |
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457 | // Construct the processor context of non-main processors |
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458 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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459 | (this.__cor){ info }; |
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460 | this.proc = proc; |
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461 | } |
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462 | |
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463 | static void init(processor & this, const char name[], cluster & _cltr) with( this ) { |
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464 | this.name = name; |
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465 | this.cltr = &_cltr; |
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466 | id = -1u; |
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467 | destroyer = 0p; |
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468 | do_terminate = false; |
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469 | preemption_alarm = 0p; |
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470 | pending_preemption = false; |
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471 | |
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472 | #if !defined(__CFA_NO_STATISTICS__) |
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473 | print_stats = 0; |
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474 | print_halts = false; |
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475 | #endif |
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476 | |
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477 | lock( this.cltr->idles ); |
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478 | int target = this.cltr->idles.total += 1u; |
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479 | unlock( this.cltr->idles ); |
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480 | |
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481 | id = doregister((__processor_id_t*)&this); |
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482 | |
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483 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
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484 | uint_fast32_t last_size = ready_mutate_lock(); |
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485 | |
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486 | // Adjust the ready queue size |
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487 | ready_queue_grow( cltr, target ); |
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488 | |
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489 | // Unlock the RWlock |
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490 | ready_mutate_unlock( last_size ); |
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491 | |
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492 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this); |
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493 | } |
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494 | |
---|
495 | // Not a ctor, it just preps the destruction but should not destroy members |
---|
496 | static void deinit(processor & this) { |
---|
497 | lock( this.cltr->idles ); |
---|
498 | int target = this.cltr->idles.total -= 1u; |
---|
499 | unlock( this.cltr->idles ); |
---|
500 | |
---|
501 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
502 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
503 | |
---|
504 | // Adjust the ready queue size |
---|
505 | ready_queue_shrink( this.cltr, target ); |
---|
506 | |
---|
507 | // Unlock the RWlock |
---|
508 | ready_mutate_unlock( last_size ); |
---|
509 | |
---|
510 | // Finally we don't need the read_lock any more |
---|
511 | unregister((__processor_id_t*)&this); |
---|
512 | } |
---|
513 | |
---|
514 | void ?{}(processor & this, const char name[], cluster & _cltr) { |
---|
515 | ( this.idle ){}; |
---|
516 | ( this.terminated ){ 0 }; |
---|
517 | ( this.runner ){}; |
---|
518 | init( this, name, _cltr ); |
---|
519 | |
---|
520 | __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this); |
---|
521 | |
---|
522 | this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this ); |
---|
523 | |
---|
524 | } |
---|
525 | |
---|
526 | void ^?{}(processor & this) with( this ){ |
---|
527 | if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) { |
---|
528 | __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this); |
---|
529 | |
---|
530 | __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED); |
---|
531 | __wake_proc( &this ); |
---|
532 | |
---|
533 | P( terminated ); |
---|
534 | verify( kernelTLS.this_processor != &this); |
---|
535 | } |
---|
536 | |
---|
537 | int err = pthread_join( kernel_thread, 0p ); |
---|
538 | if( err != 0 ) abort("KERNEL ERROR: joining processor %p caused error %s\n", &this, strerror(err)); |
---|
539 | |
---|
540 | free( this.stack ); |
---|
541 | |
---|
542 | deinit( this ); |
---|
543 | } |
---|
544 | |
---|
545 | //----------------------------------------------------------------------------- |
---|
546 | // Cluster |
---|
547 | static void ?{}(__cluster_idles & this) { |
---|
548 | this.lock = 0; |
---|
549 | this.idle = 0; |
---|
550 | this.total = 0; |
---|
551 | (this.list){}; |
---|
552 | } |
---|
553 | |
---|
554 | void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) with( this ) { |
---|
555 | this.name = name; |
---|
556 | this.preemption_rate = preemption_rate; |
---|
557 | ready_queue{}; |
---|
558 | |
---|
559 | #if !defined(__CFA_NO_STATISTICS__) |
---|
560 | print_stats = 0; |
---|
561 | stats = alloc(); |
---|
562 | __init_stats( stats ); |
---|
563 | #endif |
---|
564 | |
---|
565 | threads{ __get }; |
---|
566 | |
---|
567 | doregister(this); |
---|
568 | |
---|
569 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
570 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
571 | |
---|
572 | // Adjust the ready queue size |
---|
573 | ready_queue_grow( &this, 0 ); |
---|
574 | |
---|
575 | // Unlock the RWlock |
---|
576 | ready_mutate_unlock( last_size ); |
---|
577 | |
---|
578 | this.io.cnt = num_io; |
---|
579 | this.io.ctxs = aalloc(num_io); |
---|
580 | for(i; this.io.cnt) { |
---|
581 | (this.io.ctxs[i]){ this, io_params }; |
---|
582 | } |
---|
583 | } |
---|
584 | |
---|
585 | void ^?{}(cluster & this) { |
---|
586 | for(i; this.io.cnt) { |
---|
587 | ^(this.io.ctxs[i]){ true }; |
---|
588 | } |
---|
589 | free(this.io.ctxs); |
---|
590 | |
---|
591 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
592 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
593 | |
---|
594 | // Adjust the ready queue size |
---|
595 | ready_queue_shrink( &this, 0 ); |
---|
596 | |
---|
597 | // Unlock the RWlock |
---|
598 | ready_mutate_unlock( last_size ); |
---|
599 | |
---|
600 | #if !defined(__CFA_NO_STATISTICS__) |
---|
601 | if( 0 != this.print_stats ) { |
---|
602 | __print_stats( this.stats, this.print_stats, true, this.name, (void*)&this ); |
---|
603 | } |
---|
604 | free( this.stats ); |
---|
605 | #endif |
---|
606 | |
---|
607 | unregister(this); |
---|
608 | } |
---|
609 | |
---|
610 | //============================================================================================= |
---|
611 | // Miscellaneous Initialization |
---|
612 | //============================================================================================= |
---|
613 | //----------------------------------------------------------------------------- |
---|
614 | // Global Queues |
---|
615 | static void doregister( cluster & cltr ) { |
---|
616 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
617 | push_front( __cfa_dbg_global_clusters.list, cltr ); |
---|
618 | unlock ( __cfa_dbg_global_clusters.lock ); |
---|
619 | } |
---|
620 | |
---|
621 | static void unregister( cluster & cltr ) { |
---|
622 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
623 | remove( __cfa_dbg_global_clusters.list, cltr ); |
---|
624 | unlock( __cfa_dbg_global_clusters.lock ); |
---|
625 | } |
---|
626 | |
---|
627 | void doregister( cluster * cltr, $thread & thrd ) { |
---|
628 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
629 | cltr->nthreads += 1; |
---|
630 | push_front(cltr->threads, thrd); |
---|
631 | unlock (cltr->thread_list_lock); |
---|
632 | } |
---|
633 | |
---|
634 | void unregister( cluster * cltr, $thread & thrd ) { |
---|
635 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
636 | remove(cltr->threads, thrd ); |
---|
637 | cltr->nthreads -= 1; |
---|
638 | unlock(cltr->thread_list_lock); |
---|
639 | } |
---|
640 | |
---|
641 | static void check( int ret, const char func[] ) { |
---|
642 | if ( ret ) { // pthread routines return errno values |
---|
643 | abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) ); |
---|
644 | } // if |
---|
645 | } // Abort |
---|
646 | |
---|
647 | void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) { |
---|
648 | pthread_attr_t attr; |
---|
649 | |
---|
650 | check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute |
---|
651 | |
---|
652 | size_t stacksize; |
---|
653 | // default stack size, normally defined by shell limit |
---|
654 | check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" ); |
---|
655 | assert( stacksize >= PTHREAD_STACK_MIN ); |
---|
656 | |
---|
657 | void * stack; |
---|
658 | __cfaabi_dbg_debug_do( |
---|
659 | stack = memalign( __page_size, stacksize + __page_size ); |
---|
660 | // pthread has no mechanism to create the guard page in user supplied stack. |
---|
661 | if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) { |
---|
662 | abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
663 | } // if |
---|
664 | ); |
---|
665 | __cfaabi_dbg_no_debug_do( |
---|
666 | stack = malloc( stacksize ); |
---|
667 | ); |
---|
668 | |
---|
669 | check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" ); |
---|
670 | |
---|
671 | check( pthread_create( pthread, &attr, start, arg ), "pthread_create" ); |
---|
672 | return stack; |
---|
673 | } |
---|