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
  12 #ifdef HAVE_VALGRIND_VALGRIND_H
  13 #  include <valgrind/valgrind.h>
  14 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
  15
  16 #ifdef _XBT_WIN32
  17 #include "win32_ucontext.h"
  18 #include "win32_ucontext.c"
  19 #else
  20 #include "ucontext.h"
  21 #endif
  22
  23 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
  24
  25 static xbt_tpool_t tpool;
  26
  27 static smx_context_t
  28 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
  29     void_pfn_smxprocess_t cleanup_func, void* data);
  30
  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
  38   (*factory)->finalize = smx_ctx_sysv_factory_finalize;
  39   (*factory)->create_context = smx_ctx_sysv_create_context;
  40   /* Do not overload that method (*factory)->finalize */
  41   (*factory)->free = smx_ctx_sysv_free;
  42   (*factory)->stop = smx_ctx_sysv_stop;
  43   (*factory)->suspend = smx_ctx_sysv_suspend;
  44   (*factory)->name = "smx_sysv_context_factory";
  45
  46   if(_surf_parallel_contexts){
  47     tpool = xbt_tpool_new(2, 10);
  48     (*factory)->runall = smx_ctx_sysv_runall_parallel;
  49   }else{
  50     (*factory)->runall = smx_ctx_sysv_runall;
  51   }
  52 }
  53
  54 int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
  55 {
  56   if(tpool)
  57     xbt_tpool_destroy(tpool);
  58   return smx_ctx_base_factory_finalize(factory);
  59 }
  60
  61 smx_context_t
  62 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
  63                                   int argc, char **argv,
  64                                   void_pfn_smxprocess_t cleanup_func,
  65                                   void *data)
  66 {
  67
  68   smx_ctx_sysv_t context =
  69       (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
  70                                                                  code,
  71                                                                  argc,
  72                                                                  argv,
  73                                                                  cleanup_func,
  74                                                                  data);
  75
  76   /* If the user provided a function for the process then use it
  77      otherwise is the context for maestro */
  78   if (code) {
  79
  80     xbt_assert2(getcontext(&(context->uc)) == 0,
  81                 "Error in context saving: %d (%s)", errno,
  82                 strerror(errno));
  83
  84     context->uc.uc_link = NULL;
  85
  86     context->uc.uc_stack.ss_sp =
  87         pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
  88
  89     context->uc.uc_stack.ss_size =
  90         pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
  91
  92 #ifdef HAVE_VALGRIND_VALGRIND_H
  93     context->valgrind_stack_id =
  94         VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
  95                                 ((char *) context->uc.uc_stack.ss_sp) +
  96                                 context->uc.uc_stack.ss_size);
  97 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
  98
  99     makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
 100                 sizeof(void*)/sizeof(int), context);
 101   }
 102
 103   return (smx_context_t) context;
 104
 105 }
 106
 107 static smx_context_t
 108 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
 109     void_pfn_smxprocess_t cleanup_func,
 110     void *data)
 111 {
 112
 113   return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
 114                                            code, argc, argv, cleanup_func,
 115                                            data);
 116
 117 }
 118
 119 void smx_ctx_sysv_free(smx_context_t context)
 120 {
 121
 122   if (context) {
 123
 124 #ifdef HAVE_VALGRIND_VALGRIND_H
 125     VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
 126                                context)->valgrind_stack_id);
 127 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 128
 129   }
 130   smx_ctx_base_free(context);
 131 }
 132
 133 void smx_ctx_sysv_stop(smx_context_t context)
 134 {
 135   smx_ctx_base_stop(context);
 136
 137   smx_ctx_sysv_suspend(context);
 138 }
 139
 140 void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context)
 141 {
 142   (context->super.code) (context->super.argc, context->super.argv);
 143
 144   smx_ctx_sysv_stop((smx_context_t) context);
 145 }
 146
 147 void smx_ctx_sysv_suspend(smx_context_t context)
 148 {
 149   ucontext_t maestro_ctx =
 150       ((smx_ctx_sysv_t) simix_global->maestro_process->context)->uc;
 151
 152   int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
 153
 154   xbt_assert0((rv == 0), "Context swapping failure");
 155 }
 156
 157 void smx_ctx_sysv_resume(smx_context_t new_context)
 158 {
 159   smx_ctx_sysv_t maestro =
 160       (smx_ctx_sysv_t) simix_global->maestro_process->context;
 161
 162   int rv =
 163       swapcontext(&(maestro->uc), &((smx_ctx_sysv_t) new_context)->uc);
 164
 165   xbt_assert0((rv == 0), "Context swapping failure");
 166 }
 167
 168 void smx_ctx_sysv_runall(xbt_swag_t processes)
 169 {
 170   smx_context_t old_context;
 171   smx_process_t process;
 172
 173   while ((process = xbt_swag_extract(processes))) {
 174     old_context = smx_current_context;
 175     smx_current_context = process->context;
 176     smx_ctx_sysv_resume(smx_current_context);
 177     smx_current_context = old_context;
 178   }
 179 }
 180
 181 void smx_ctx_sysv_runall_parallel(xbt_swag_t processes)
 182 {
 183   smx_process_t process;
 184   while((process = xbt_swag_extract(processes))){
 185     xbt_tpool_queue_job(tpool, (void_f_pvoid_t)smx_ctx_sysv_resume, process->context);
 186   }
 187 }