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 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 #ifdef CONTEXT_THREADS  /* To use parallel ucontexts a thread pool is needed */
  48     tpool = xbt_tpool_new(2, 10);
  49     (*factory)->runall = smx_ctx_sysv_runall_parallel;
  50     (*factory)->self = smx_ctx_sysv_self_parallel;
  51 #else
  52     THROW0(arg_error, 0, "No thread support for parallel context execution");
  53 #endif
  54   }else{
  55     (*factory)->runall = smx_ctx_sysv_runall;
  56   }
  57 }
  58
  59 int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
  60 {
  61   if(tpool)
  62     xbt_tpool_destroy(tpool);
  63   return smx_ctx_base_factory_finalize(factory);
  64 }
  65
  66 smx_context_t
  67 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
  68                                   int argc, char **argv,
  69                                   void_pfn_smxprocess_t cleanup_func,
  70                                   void *data)
  71 {
  72
  73   smx_ctx_sysv_t context =
  74       (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
  75                                                                  code,
  76                                                                  argc,
  77                                                                  argv,
  78                                                                  cleanup_func,
  79                                                                  data);
  80
  81   /* If the user provided a function for the process then use it
  82      otherwise is the context for maestro */
  83   if (code) {
  84
  85     xbt_assert2(getcontext(&(context->uc)) == 0,
  86                 "Error in context saving: %d (%s)", errno,
  87                 strerror(errno));
  88
  89     context->uc.uc_link = NULL;
  90
  91     context->uc.uc_stack.ss_sp =
  92         pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
  93
  94     context->uc.uc_stack.ss_size =
  95         pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
  96
  97 #ifdef HAVE_VALGRIND_VALGRIND_H
  98     context->valgrind_stack_id =
  99         VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
 100                                 ((char *) context->uc.uc_stack.ss_sp) +
 101                                 context->uc.uc_stack.ss_size);
 102 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 103
 104     makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
 105                 sizeof(void*)/sizeof(int), context);
 106   }else{
 107     maestro_context = context;
 108   }
 109
 110   return (smx_context_t) context;
 111
 112 }
 113
 114 static smx_context_t
 115 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
 116     void_pfn_smxprocess_t cleanup_func,
 117     void *data)
 118 {
 119
 120   return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
 121                                            code, argc, argv, cleanup_func,
 122                                            data);
 123
 124 }
 125
 126 void smx_ctx_sysv_free(smx_context_t context)
 127 {
 128
 129   if (context) {
 130
 131 #ifdef HAVE_VALGRIND_VALGRIND_H
 132     VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
 133                                context)->valgrind_stack_id);
 134 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 135
 136   }
 137   smx_ctx_base_free(context);
 138 }
 139
 140 void smx_ctx_sysv_stop(smx_context_t context)
 141 {
 142   smx_ctx_base_stop(context);
 143   smx_ctx_sysv_suspend(context);
 144 }
 145
 146 void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context)
 147 {
 148   (context->super.code) (context->super.argc, context->super.argv);
 149
 150   smx_ctx_sysv_stop((smx_context_t) context);
 151 }
 152
 153 void smx_ctx_sysv_suspend(smx_context_t context)
 154 {
 155   smx_current_context = (smx_context_t)maestro_context;
 156   int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &((smx_ctx_sysv_t)context)->old_uc);
 157
 158   xbt_assert0((rv == 0), "Context swapping failure");
 159 }
 160
 161 void smx_ctx_sysv_resume(smx_context_t context)
 162 {
 163   smx_current_context = context;
 164   int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) 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_process_t process;
 172
 173   while ((process = xbt_swag_extract(processes)))
 174     smx_ctx_sysv_resume(process->context);
 175 }
 176
 177 void smx_ctx_sysv_resume_parallel(smx_context_t context)
 178 {
 179   xbt_os_thread_set_extra_data(context);
 180   int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) context)->uc);
 181   xbt_os_thread_set_extra_data(NULL);
 182
 183   xbt_assert0((rv == 0), "Context swapping failure");
 184 }
 185
 186 void smx_ctx_sysv_runall_parallel(xbt_swag_t processes)
 187 {
 188   smx_process_t process;
 189   while((process = xbt_swag_extract(processes))){
 190     xbt_tpool_queue_job(tpool, (void_f_pvoid_t)smx_ctx_sysv_resume_parallel, process->context);
 191   }
 192   xbt_tpool_wait_all(tpool);
 193 }
 194
 195 smx_context_t smx_ctx_sysv_self_parallel(void)
 196 {
 197   smx_context_t self_context = (smx_context_t) xbt_os_thread_get_extra_data();
 198   return self_context ? self_context : (smx_context_t) maestro_context;
 199 }