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
  10
  11 #include "smx_context_sysv_private.h"
  12 #include "xbt/threadpool.h"
  13
  14 #ifdef HAVE_VALGRIND_VALGRIND_H
  15 #  include <valgrind/valgrind.h>
  16 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
  17
  18 #ifdef _XBT_WIN32
  19 #include "win32_ucontext.h"
  20 #include "win32_ucontext.c"
  21 #else
  22 #include "ucontext.h"
  23 #endif
  24
  25 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
  26
  27 static xbt_tpool_t tpool;
  28
  29 static smx_context_t
  30 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
  31     void_pfn_smxprocess_t cleanup_func, void* data);
  32
  33
  34 static void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context);
  35
  36 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t * factory)
  37 {
  38   smx_ctx_base_factory_init(factory);
  39
  40   (*factory)->finalize = smx_ctx_sysv_factory_finalize;
  41   (*factory)->create_context = smx_ctx_sysv_create_context;
  42   /* Do not overload that method (*factory)->finalize */
  43   (*factory)->free = smx_ctx_sysv_free;
  44   (*factory)->stop = smx_ctx_sysv_stop;
  45   (*factory)->suspend = smx_ctx_sysv_suspend;
  46   (*factory)->name = "smx_sysv_context_factory";
  47
  48   if(_surf_parallel_contexts){
  49     tpool = xbt_tpool_new(2, 10);
  50     (*factory)->runall = smx_ctx_sysv_runall_parallel;
  51   }else{
  52     (*factory)->runall = smx_ctx_sysv_runall;
  53   }
  54 }
  55
  56 int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
  57 {
  58   if(tpool)
  59     xbt_tpool_destroy(tpool);
  60   return smx_ctx_base_factory_finalize(factory);
  61 }
  62
  63 smx_context_t
  64 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
  65                                   int argc, char **argv,
  66                                   void_pfn_smxprocess_t cleanup_func,
  67                                   void *data)
  68 {
  69
  70   smx_ctx_sysv_t context =
  71       (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
  72                                                                  code,
  73                                                                  argc,
  74                                                                  argv,
  75                                                                  cleanup_func,
  76                                                                  data);
  77
  78   /* If the user provided a function for the process then use it
  79      otherwise is the context for maestro */
  80   if (code) {
  81
  82     xbt_assert2(getcontext(&(context->uc)) == 0,
  83                 "Error in context saving: %d (%s)", errno,
  84                 strerror(errno));
  85
  86     context->uc.uc_link = NULL;
  87
  88     context->uc.uc_stack.ss_sp =
  89         pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
  90
  91     context->uc.uc_stack.ss_size =
  92         pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
  93
  94 #ifdef HAVE_VALGRIND_VALGRIND_H
  95     context->valgrind_stack_id =
  96         VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
  97                                 ((char *) context->uc.uc_stack.ss_sp) +
  98                                 context->uc.uc_stack.ss_size);
  99 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 100
 101     makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
 102                 sizeof(void*)/sizeof(int), context);
 103   }
 104
 105   return (smx_context_t) context;
 106
 107 }
 108
 109 static smx_context_t
 110 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
 111     void_pfn_smxprocess_t cleanup_func,
 112     void *data)
 113 {
 114
 115   return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
 116                                            code, argc, argv, cleanup_func,
 117                                            data);
 118
 119 }
 120
 121 void smx_ctx_sysv_free(smx_context_t context)
 122 {
 123
 124   if (context) {
 125
 126 #ifdef HAVE_VALGRIND_VALGRIND_H
 127     VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
 128                                context)->valgrind_stack_id);
 129 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 130
 131   }
 132   smx_ctx_base_free(context);
 133 }
 134
 135 void smx_ctx_sysv_stop(smx_context_t context)
 136 {
 137   smx_ctx_base_stop(context);
 138
 139   smx_ctx_sysv_suspend(context);
 140 }
 141
 142 void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context)
 143 {
 144   (context->super.code) (context->super.argc, context->super.argv);
 145
 146   smx_ctx_sysv_stop((smx_context_t) context);
 147 }
 148
 149 void smx_ctx_sysv_suspend(smx_context_t context)
 150 {
 151   ucontext_t maestro_ctx =
 152       ((smx_ctx_sysv_t) simix_global->maestro_process->context)->uc;
 153
 154   int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
 155
 156   xbt_assert0((rv == 0), "Context swapping failure");
 157 }
 158
 159 void smx_ctx_sysv_resume(smx_context_t new_context)
 160 {
 161   smx_ctx_sysv_t maestro =
 162       (smx_ctx_sysv_t) simix_global->maestro_process->context;
 163
 164   int rv =
 165       swapcontext(&(maestro->uc), &((smx_ctx_sysv_t) new_context)->uc);
 166
 167   xbt_assert0((rv == 0), "Context swapping failure");
 168 }
 169
 170 void smx_ctx_sysv_runall(xbt_swag_t processes)
 171 {
 172   smx_context_t old_context;
 173   smx_process_t process;
 174
 175   while((process = xbt_swag_extract(processes))){
 176     old_context = smx_current_context;
 177     smx_current_context = process->context;
 178     smx_ctx_sysv_resume(smx_current_context);
 179     smx_current_context = old_context;
 180   }
 181 }
 182
 183 void smx_ctx_sysv_runall_parallel(xbt_swag_t processes)
 184 {
 185   smx_process_t process;
 186   while((process = xbt_swag_extract(processes))){
 187     xbt_tpool_queue_job(tpool, (void_f_pvoid_t)smx_ctx_sysv_resume, process->context);
 188   }
 189 }