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/threadpool.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_tpool_t tpool;
  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
  33 static void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context);
  34
  35 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
  36 {
  37   smx_ctx_base_factory_init(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(_surf_parallel_contexts){
  48     tpool = xbt_tpool_new(2, 10);
  49     (*factory)->runall = smx_ctx_sysv_runall_parallel;
  50   }else{
  51     (*factory)->runall = smx_ctx_sysv_runall;
  52   }
  53 }
  54
  55 int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
  56 {
  57   if(tpool)
  58     xbt_tpool_destroy(tpool);
  59   return smx_ctx_base_factory_finalize(factory);
  60 }
  61
  62 smx_context_t
  63 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
  64                                   int argc, char **argv,
  65                                   void_pfn_smxprocess_t cleanup_func,
  66                                   void *data)
  67 {
  68
  69   smx_ctx_sysv_t context =
  70       (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
  71                                                                  code,
  72                                                                  argc,
  73                                                                  argv,
  74                                                                  cleanup_func,
  75                                                                  data);
  76
  77   /* If the user provided a function for the process then use it
  78      otherwise is the context for maestro */
  79   if (code) {
  80
  81     xbt_assert2(getcontext(&(context->uc)) == 0,
  82                 "Error in context saving: %d (%s)", errno,
  83                 strerror(errno));
  84
  85     context->uc.uc_link = NULL;
  86
  87     context->uc.uc_stack.ss_sp =
  88         pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
  89
  90     context->uc.uc_stack.ss_size =
  91         pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
  92
  93 #ifdef HAVE_VALGRIND_VALGRIND_H
  94     context->valgrind_stack_id =
  95         VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
  96                                 ((char *) context->uc.uc_stack.ss_sp) +
  97                                 context->uc.uc_stack.ss_size);
  98 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
  99
 100     makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
 101                 sizeof(void*)/sizeof(int), context);
 102   }
 103
 104   return (smx_context_t) context;
 105
 106 }
 107
 108 static smx_context_t
 109 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
 110     void_pfn_smxprocess_t cleanup_func,
 111     void *data)
 112 {
 113
 114   return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
 115                                            code, argc, argv, cleanup_func,
 116                                            data);
 117
 118 }
 119
 120 void smx_ctx_sysv_free(smx_context_t context)
 121 {
 122
 123   if (context) {
 124
 125 #ifdef HAVE_VALGRIND_VALGRIND_H
 126     VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
 127                                context)->valgrind_stack_id);
 128 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 129
 130   }
 131   smx_ctx_base_free(context);
 132 }
 133
 134 void smx_ctx_sysv_stop(smx_context_t context)
 135 {
 136   smx_ctx_base_stop(context);
 137
 138   smx_ctx_sysv_suspend(context);
 139 }
 140
 141 void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context)
 142 {
 143   (context->super.code) (context->super.argc, context->super.argv);
 144
 145   smx_ctx_sysv_stop((smx_context_t) context);
 146 }
 147
 148 void smx_ctx_sysv_suspend(smx_context_t context)
 149 {
 150   ucontext_t maestro_ctx =
 151       ((smx_ctx_sysv_t) simix_global->maestro_process->context)->uc;
 152
 153   int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
 154
 155   xbt_assert0((rv == 0), "Context swapping failure");
 156 }
 157
 158 void smx_ctx_sysv_resume(smx_context_t new_context)
 159 {
 160   smx_ctx_sysv_t maestro =
 161       (smx_ctx_sysv_t) simix_global->maestro_process->context;
 162
 163   int rv =
 164       swapcontext(&(maestro->uc), &((smx_ctx_sysv_t) new_context)->uc);
 165
 166   xbt_assert0((rv == 0), "Context swapping failure");
 167 }
 168
 169 void smx_ctx_sysv_runall(xbt_swag_t processes)
 170 {
 171   smx_context_t old_context;
 172   smx_process_t process;
 173
 174   while ((process = xbt_swag_extract(processes))) {
 175     old_context = smx_current_context;
 176     smx_current_context = process->context;
 177     smx_ctx_sysv_resume(smx_current_context);
 178     smx_current_context = old_context;
 179   }
 180 }
 181
 182 void smx_ctx_sysv_runall_parallel(xbt_swag_t processes)
 183 {
 184   smx_process_t process;
 185   while((process = xbt_swag_extract(processes))){
 186     xbt_tpool_queue_job(tpool, (void_f_pvoid_t)smx_ctx_sysv_resume, process->context);
 187   }
 188 }