X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ea55b530facfb04b499b016152f739e024445aa4..4bc88c13ed1b358c2cd32e09b85e52e5fdb21b05:/src/simix/smx_context.cpp

diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp
index ace2095439..82a78fd036 100644
--- a/src/simix/smx_context.cpp
+++ b/src/simix/smx_context.cpp
@@ -11,6 +11,7 @@
 #include "xbt/swag.h"
 #include "xbt/xbt_os_thread.h"
 #include "smx_private.h"
+#include "smx_private.hpp"
 #include "simgrid/sg_config.h"
 #include "src/internal_config.h"
 #include "simgrid/modelchecker.h"
@@ -28,15 +29,13 @@
 #define _aligned_free  __mingw_aligned_free 
 #endif //MINGW
 
-#ifdef HAVE_VALGRIND_VALGRIND_H
+#ifdef HAVE_VALGRIND_H
 # include <valgrind/valgrind.h>
 #endif
 
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix,
-                                "Context switching mechanism");
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism");
 
 char* smx_context_factory_name = NULL; /* factory name specified by --cfg=contexts/factory:value */
-smx_ctx_factory_initializer_t smx_factory_initializer_to_use = NULL;
 int smx_context_stack_size;
 int smx_context_stack_size_was_set = 0;
 int smx_context_guard_size;
@@ -56,59 +55,52 @@ static e_xbt_parmap_mode_t smx_parallel_synchronization_mode = XBT_PARMAP_DEFAUL
  */
 void SIMIX_context_mod_init(void)
 {
-#if defined(CONTEXT_THREADS) && !defined(HAVE_THREAD_LOCAL_STORAGE)
+#if defined(HAVE_THREAD_CONTEXTS) && !defined(HAVE_THREAD_LOCAL_STORAGE)
   /* the __thread storage class is not available on this platform:
    * use getspecific/setspecific instead to store the current context in each thread */
   xbt_os_thread_key_create(&smx_current_context_key);
 #endif
   if (!simix_global->context_factory) {
     /* select the context factory to use to create the contexts */
-    if (smx_factory_initializer_to_use) {
-      smx_factory_initializer_to_use(&simix_global->context_factory);
-    }
+    if (simgrid::simix::factory_initializer)
+      simix_global->context_factory = simgrid::simix::factory_initializer();
     else { /* use the factory specified by --cfg=contexts/factory:value */
-
-
-      if (!strcmp(smx_context_factory_name, "thread")) {
-        /* use os threads (either pthreads or windows ones) */
-        SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
-      }
-#ifdef CONTEXT_UCONTEXT
-      else if (!strcmp(smx_context_factory_name, "ucontext")) {
-        /* use ucontext */
-        SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
-      }
+#if defined(HAVE_THREAD_CONTEXTS)
+      if (!strcmp(smx_context_factory_name, "thread"))
+        simix_global->context_factory = simgrid::simix::thread_factory();
+#else
+      if (0);
 #endif
-#ifdef HAVE_RAWCTX
-      else if (!strcmp(smx_context_factory_name, "raw")) {
-        /* use raw contexts */
-        SIMIX_ctx_raw_factory_init(&simix_global->context_factory);
-      }
+#ifdef HAVE_UCONTEXT_CONTEXTS
+      else if (!strcmp(smx_context_factory_name, "ucontext"))
+        simix_global->context_factory = simgrid::simix::sysv_factory();
 #endif
-#ifdef HAVE_BOOST_CONTEXT
-      else if (!strcmp(smx_context_factory_name, "boost")) {
-        /* use Boost.Context */
-        SIMIX_ctx_boost_factory_init(&simix_global->context_factory);
-      }
+#ifdef HAVE_RAW_CONTEXTS
+      else if (!strcmp(smx_context_factory_name, "raw"))
+        simix_global->context_factory = simgrid::simix::raw_factory();
+#endif
+#ifdef HAVE_BOOST_CONTEXTS
+      else if (!strcmp(smx_context_factory_name, "boost"))
+        simix_global->context_factory = simgrid::simix::boost_factory();
 #endif
       else {
         XBT_ERROR("Invalid context factory specified. Valid factories on this machine:");
-#ifdef HAVE_RAWCTX
+#ifdef HAVE_RAW_CONTEXTS
         XBT_ERROR("  raw: high performance context factory implemented specifically for SimGrid");
 #else
         XBT_ERROR("  (raw contexts were disabled at compilation time on this machine -- check configure logs for details)");
 #endif
-#ifdef CONTEXT_UCONTEXT
+#ifdef HAVE_UCONTEXT_CONTEXTS
         XBT_ERROR("  ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)");
 #else
         XBT_ERROR("  (ucontext was disabled at compilation time on this machine -- check configure logs for details)");
 #endif
-#ifdef HAVE_BOOST_CONTEXT
+#ifdef HAVE_BOOST_CONTEXTS
         XBT_ERROR("  boost: this uses the boost libraries context implementation");
 #else
         XBT_ERROR("  (boost was disabled at compilation time on this machine -- check configure logs for details. Did you install the libboost-context-dev package?)");
 #endif
-        XBT_ERROR("  thread: slow portability layer using system threads (pthreads on UNIX, CreateThread() on windows)");
+        XBT_ERROR("  thread: slow portability layer using pthreads as provided by gcc");
         xbt_die("Please use a valid factory.");
       }
     }
@@ -120,14 +112,8 @@ void SIMIX_context_mod_init(void)
  */
 void SIMIX_context_mod_exit(void)
 {
-  if (simix_global->context_factory) {
-    smx_pfn_context_factory_finalize_t finalize_factory;
-
-    /* finalize the context factory */
-    finalize_factory = simix_global->context_factory->finalize;
-    finalize_factory(&simix_global->context_factory);
-  }
-  xbt_dict_remove((xbt_dict_t) _sg_cfg_set,"contexts/factory");
+  delete simix_global->context_factory;
+  simix_global->context_factory = nullptr;
 }
 
 void *SIMIX_context_stack_new(void)
@@ -140,30 +126,29 @@ void *SIMIX_context_stack_new(void)
 
   if (smx_context_guard_size > 0 && !MC_is_active()) {
 
-#if defined(_XBT_WIN32) || (PTH_STACKGROWTH != -1)
+#if !defined(PTH_STACKGROWTH) || (PTH_STACKGROWTH != -1)
     static int warned_once = 0;
     if (!warned_once) {
-      XBT_WARN("Stack overflow protection is known to be broken on your system.  Either you're on Windows or PTH_STACKGROWTH != -1 (current value is %d).",
-               PTH_STACKGROWTH);
+      XBT_WARN("Stack overflow protection is known to be broken on your system.  Either stack grows upwards, or it was not even tested properly.");
       warned_once = 1;
     }
 #endif
 
     size_t size = smx_context_stack_size + smx_context_guard_size;
-#ifdef HAVE_MC
+#if HAVE_MC
     /* Cannot use posix_memalign when HAVE_MC. Align stack by hand, and save the
      * pointer returned by xbt_malloc0. */
-    char *alloc = xbt_malloc0(size + xbt_pagesize);
+    char *alloc = (char*)xbt_malloc0(size + xbt_pagesize);
     stack = alloc - ((uintptr_t)alloc & (xbt_pagesize - 1)) + xbt_pagesize;
     *((void **)stack - 1) = alloc;
-#elif !defined(_XBT_WIN32)
+#elif !defined(_WIN32)
     if (posix_memalign(&stack, xbt_pagesize, size) != 0)
       xbt_die("Failed to allocate stack.");
 #else
     stack = _aligned_malloc(size, xbt_pagesize);
 #endif
 
-#ifndef _XBT_WIN32
+#ifndef _WIN32
     if (mprotect(stack, smx_context_guard_size, PROT_NONE) == -1) {
       xbt_die("Failed to protect stack: %s", strerror(errno));
       /* This is fatal. We are going to fail at some point when
@@ -175,11 +160,9 @@ void *SIMIX_context_stack_new(void)
     stack = xbt_malloc0(smx_context_stack_size);
   }
 
-#ifdef HAVE_VALGRIND_VALGRIND_H
-  unsigned int valgrind_stack_id =
-    VALGRIND_STACK_REGISTER(stack, (char *)stack + smx_context_stack_size);
-  memcpy((char *)stack + smx_context_usable_stack_size, &valgrind_stack_id,
-         sizeof valgrind_stack_id);
+#ifdef HAVE_VALGRIND_H
+  unsigned int valgrind_stack_id = VALGRIND_STACK_REGISTER(stack, (char *)stack + smx_context_stack_size);
+  memcpy((char *)stack + smx_context_usable_stack_size, &valgrind_stack_id, sizeof valgrind_stack_id);
 #endif
 
   return stack;
@@ -190,36 +173,30 @@ void SIMIX_context_stack_delete(void *stack)
   if (!stack)
     return;
 
-#ifdef HAVE_VALGRIND_VALGRIND_H
+#ifdef HAVE_VALGRIND_H
   unsigned int valgrind_stack_id;
-  memcpy(&valgrind_stack_id, (char *)stack + smx_context_usable_stack_size,
-         sizeof valgrind_stack_id);
+  memcpy(&valgrind_stack_id, (char *)stack + smx_context_usable_stack_size, sizeof valgrind_stack_id);
   VALGRIND_STACK_DEREGISTER(valgrind_stack_id);
 #endif
 
-#ifndef WIN32
+#ifndef _WIN32
   if (smx_context_guard_size > 0 && !MC_is_active()) {
     stack = (char *)stack - smx_context_guard_size;
-    if (mprotect(stack, smx_context_guard_size,
-                 PROT_READ | PROT_WRITE) == -1) {
+    if (mprotect(stack, smx_context_guard_size, PROT_READ | PROT_WRITE) == -1) {
       XBT_WARN("Failed to remove page protection: %s", strerror(errno));
       /* try to pursue anyway */
     }
-#ifdef HAVE_MC
+#if HAVE_MC
     /* Retrieve the saved pointer.  See SIMIX_context_stack_new above. */
     stack = *((void **)stack - 1);
 #endif
   }
-#endif
+#endif /* not windows */
 
   xbt_free(stack);
 }
 
-/**
- * \brief Returns whether some parallel threads are used
- * for the user contexts.
- * \return 1 if parallelism is used
- */
+/** @brief Returns whether some parallel threads are used for the user contexts. */
 int SIMIX_context_is_parallel(void) {
   return smx_parallel_contexts > 1;
 }
@@ -248,12 +225,9 @@ void SIMIX_context_set_nthreads(int nb_threads) {
      nb_threads = xbt_os_get_numcores();
      XBT_INFO("Auto-setting contexts/nthreads to %d",nb_threads);
   }   
-  
-  if (nb_threads > 1) {
-#ifndef CONTEXT_THREADS
-    THROWF(arg_error, 0, "The thread factory cannot be run in parallel");
+#ifndef HAVE_THREAD_CONTEXTS
+  xbt_assert(nb_threads == 1, "Parallel runs are impossible when the pthreads are missing.");
 #endif
-  }
   smx_parallel_contexts = nb_threads;
 }