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
  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 smx_context_t
  27 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
  28     void_pfn_smxprocess_t cleanup_func,
  29     smx_process_t process);
  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
  37   smx_ctx_base_factory_init(factory);
  38
  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)->runall = smx_ctx_sysv_runall;
  45   (*factory)->name = "smx_sysv_context_factory";
  46 }
  47
  48 smx_context_t
  49 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
  50                                   int argc, char **argv,
  51                                   void_pfn_smxprocess_t cleanup_func,
  52                                   smx_process_t process)
  53 {
  54
  55   smx_ctx_sysv_t context =
  56       (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
  57                                                                  code,
  58                                                                  argc,
  59                                                                  argv,
  60                                                                  cleanup_func,
  61                                                                  process);
  62
  63   /* If the user provided a function for the process then use it
  64      otherwise is the context for maestro */
  65   if (code) {
  66
  67     xbt_assert2(getcontext(&(context->uc)) == 0,
  68                 "Error in context saving: %d (%s)", errno,
  69                 strerror(errno));
  70
  71     context->uc.uc_link = NULL;
  72
  73     context->uc.uc_stack.ss_sp =
  74         pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
  75
  76     context->uc.uc_stack.ss_size =
  77         pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
  78
  79 #ifdef HAVE_VALGRIND_VALGRIND_H
  80     context->valgrind_stack_id =
  81         VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
  82                                 ((char *) context->uc.uc_stack.ss_sp) +
  83                                 context->uc.uc_stack.ss_size);
  84 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
  85
  86     makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
  87                 sizeof(void*)/sizeof(int), context);
  88   }
  89
  90   return (smx_context_t) context;
  91
  92 }
  93
  94 static smx_context_t
  95 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
  96     void_pfn_smxprocess_t cleanup_func,
  97     smx_process_t process)
  98 {
  99
 100   return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
 101                                            code, argc, argv, cleanup_func,
 102                                            process);
 103
 104 }
 105
 106 void smx_ctx_sysv_free(smx_context_t context)
 107 {
 108
 109   if (context) {
 110
 111 #ifdef HAVE_VALGRIND_VALGRIND_H
 112     VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
 113                                context)->valgrind_stack_id);
 114 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 115
 116   }
 117   smx_ctx_base_free(context);
 118 }
 119
 120 void smx_ctx_sysv_stop(smx_context_t context)
 121 {
 122   smx_ctx_base_stop(context);
 123
 124   smx_ctx_sysv_suspend(context);
 125 }
 126
 127 void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context)
 128 {
 129   (context->super.code) (context->super.argc, context->super.argv);
 130
 131   smx_ctx_sysv_stop((smx_context_t) context);
 132 }
 133
 134 void smx_ctx_sysv_suspend(smx_context_t context)
 135 {
 136   ucontext_t maestro_ctx =
 137       ((smx_ctx_sysv_t) simix_global->maestro_process->context)->uc;
 138
 139   int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
 140
 141   xbt_assert0((rv == 0), "Context swapping failure");
 142 }
 143
 144 void smx_ctx_sysv_resume(smx_context_t new_context)
 145 {
 146   smx_ctx_sysv_t maestro =
 147       (smx_ctx_sysv_t) simix_global->maestro_process->context;
 148
 149   int rv =
 150       swapcontext(&(maestro->uc), &((smx_ctx_sysv_t) new_context)->uc);
 151
 152   xbt_assert0((rv == 0), "Context swapping failure");
 153 }
 154
 155 void smx_ctx_sysv_runall(xbt_swag_t processes)
 156 {
 157   smx_process_t process;
 158   while((process = xbt_swag_extract(processes))){
 159     simix_global->current_process = process;
 160     smx_ctx_sysv_resume(process->context);
 161     simix_global->current_process = simix_global->maestro_process;
 162   }
 163 }