src/simix/smx_context_sysv.c

   1 /* context_sysv - context switching with ucontextes from System V           */
   2
   3 /* Copyright (c) 2009, 2010. The SimGrid Team.
   4  * All rights reserved.                                                     */
   5
   6  /* This program is free software; you can redistribute it and/or modify it
   7   * under the terms of the license (GNU LGPL) which comes with this package. */
   8
   9 #include "smx_context_sysv_private.h"
  10 #include "xbt/parmap.h"
  11 #include "simix/private.h"
  12
  13 #ifdef HAVE_VALGRIND_VALGRIND_H
  14 #  include <valgrind/valgrind.h>
  15 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
  16
  17 #ifdef _XBT_WIN32
  18 #include "win32_ucontext.h"
  19 #include "win32_ucontext.c"
  20 #else
  21 #include "ucontext.h"
  22 #endif
  23
  24 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
  25
  26 static xbt_parmap_t parmap;
  27
  28 static smx_context_t
  29 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
  30     void_pfn_smxprocess_t cleanup_func, void* data);
  31
  32 static void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context);
  33
  34 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
  35 {
  36   smx_ctx_base_factory_init(factory);
  37   VERB0("Activating SYSV context factory");
  38
  39   (*factory)->finalize = smx_ctx_sysv_factory_finalize;
  40   (*factory)->create_context = smx_ctx_sysv_create_context;
  41   /* Do not overload that method (*factory)->finalize */
  42   (*factory)->free = smx_ctx_sysv_free;
  43   (*factory)->stop = smx_ctx_sysv_stop;
  44   (*factory)->suspend = smx_ctx_sysv_suspend;
  45   (*factory)->name = "smx_sysv_context_factory";
  46
  47   if (smx_parallel_contexts) {
  48 #ifdef CONTEXT_THREADS  /* To use parallel ucontexts a thread pool is needed */
  49     parmap = xbt_parmap_new(2);
  50     (*factory)->runall = smx_ctx_sysv_runall_parallel;
  51     (*factory)->self = smx_ctx_sysv_self_parallel;
  52 #else
  53     THROW0(arg_error, 0, "No thread support for parallel context execution");
  54 #endif
  55   }else{
  56     (*factory)->runall = smx_ctx_sysv_runall;
  57   }
  58 }
  59
  60 int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
  61 {
  62   if(parmap)
  63     xbt_parmap_destroy(parmap);
  64   return smx_ctx_base_factory_finalize(factory);
  65 }
  66
  67 smx_context_t
  68 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
  69                                   int argc, char **argv,
  70                                   void_pfn_smxprocess_t cleanup_func,
  71                                   void *data)
  72 {
  73
  74   smx_ctx_sysv_t context =
  75       (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
  76                                                                  code,
  77                                                                  argc,
  78                                                                  argv,
  79                                                                  cleanup_func,
  80                                                                  data);
  81
  82   /* If the user provided a function for the process then use it
  83      otherwise is the context for maestro */
  84   if (code) {
  85
  86     xbt_assert2(getcontext(&(context->uc)) == 0,
  87                 "Error in context saving: %d (%s)", errno,
  88                 strerror(errno));
  89
  90     context->uc.uc_link = NULL;
  91
  92     context->uc.uc_stack.ss_sp =
  93         pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
  94
  95     context->uc.uc_stack.ss_size =
  96         pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
  97
  98 #ifdef HAVE_VALGRIND_VALGRIND_H
  99     context->valgrind_stack_id =
 100         VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
 101                                 ((char *) context->uc.uc_stack.ss_sp) +
 102                                 context->uc.uc_stack.ss_size);
 103 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 104
 105     makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
 106                 sizeof(void*)/sizeof(int), context);
 107   }else{
 108     maestro_context = context;
 109   }
 110
 111   return (smx_context_t) context;
 112
 113 }
 114
 115 static smx_context_t
 116 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
 117     void_pfn_smxprocess_t cleanup_func,
 118     void *data)
 119 {
 120
 121   return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
 122                                            code, argc, argv, cleanup_func,
 123                                            data);
 124
 125 }
 126
 127 void smx_ctx_sysv_free(smx_context_t context)
 128 {
 129
 130   if (context) {
 131
 132 #ifdef HAVE_VALGRIND_VALGRIND_H
 133     VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
 134                                context)->valgrind_stack_id);
 135 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 136
 137   }
 138   smx_ctx_base_free(context);
 139 }
 140
 141 void smx_ctx_sysv_stop(smx_context_t context)
 142 {
 143   smx_ctx_base_stop(context);
 144   smx_ctx_sysv_suspend(context);
 145 }
 146
 147 void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context)
 148 {
 149   (context->super.code) (context->super.argc, context->super.argv);
 150
 151   smx_ctx_sysv_stop((smx_context_t) context);
 152 }
 153
 154 void smx_ctx_sysv_suspend(smx_context_t context)
 155 {
 156   smx_current_context = (smx_context_t)maestro_context;
 157   int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &((smx_ctx_sysv_t)context)->old_uc);
 158
 159   xbt_assert0((rv == 0), "Context swapping failure");
 160 }
 161
 162 void smx_ctx_sysv_resume(smx_context_t context)
 163 {
 164   smx_current_context = context;
 165   int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) context)->uc);
 166
 167   xbt_assert0((rv == 0), "Context swapping failure");
 168 }
 169
 170 void smx_ctx_sysv_runall(xbt_dynar_t processes)
 171 {
 172   smx_process_t process;
 173   unsigned int cursor;
 174
 175   xbt_dynar_foreach(processes, cursor, process) {
 176     DEBUG2("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
 177     smx_ctx_sysv_resume(process->context);
 178   }
 179   xbt_dynar_reset(processes);
 180 }
 181
 182 void smx_ctx_sysv_resume_parallel(smx_process_t process)
 183 {
 184   smx_context_t context = process->context;
 185   xbt_os_thread_set_extra_data(context);
 186   int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) context)->uc);
 187   xbt_os_thread_set_extra_data(NULL);
 188
 189   xbt_assert0((rv == 0), "Context swapping failure");
 190 }
 191
 192 void smx_ctx_sysv_runall_parallel(xbt_dynar_t processes)
 193 {
 194   xbt_parmap_apply(parmap, (void_f_pvoid_t)smx_ctx_sysv_resume_parallel, processes);
 195   xbt_dynar_reset(processes);
 196 }
 197
 198 smx_context_t smx_ctx_sysv_self_parallel(void)
 199 {
 200   smx_context_t self_context = (smx_context_t) xbt_os_thread_get_extra_data();
 201   return self_context ? self_context : (smx_context_t) maestro_context;
 202 }