X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/b2fe69328dc3b66ce74894b58f5446514e48d53c..3e9453209f1da7deb92fe629428e49f3528217bd:/src/kernel/context/Context.cpp

diff --git a/src/kernel/context/Context.cpp b/src/kernel/context/Context.cpp
index 71046510aa..c4f79b46a4 100644
--- a/src/kernel/context/Context.cpp
+++ b/src/kernel/context/Context.cpp
@@ -1,106 +1,97 @@
-/* Copyright (c) 2007-2018. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2007-2023. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
-#include "mc/mc.h"
+#include "src/mc/mc.h"
 
+#include "simgrid/Exception.hpp"
+#include "simgrid/s4u/Host.hpp"
+#include "src/kernel/activity/CommImpl.hpp"
 #include "src/kernel/context/Context.hpp"
-#include "src/simix/smx_private.hpp"
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-
-/**
- * @brief creates a new context for a user level process
- * @param code a main function
- * @param cleanup_func the function to call when the context stops
- * @param simix_process
- */
-smx_context_t SIMIX_context_new(
-  std::function<void()> code,
-  void_pfn_smxprocess_t cleanup_func,
-  smx_actor_t simix_process)
+#include "src/sthread/sthread.h"
+
+#include <vector>
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ker_context, kernel, "Context switching mechanism");
+
+namespace simgrid::kernel::context {
+
+void Context::set_nthreads(int nb_threads)
 {
-  xbt_assert(simix_global, "simix is not initialized, please call MSG_init first");
-  return simix_global->context_factory->create_context(
-    std::move(code), cleanup_func, simix_process);
+  if (nb_threads <= 0) {
+    nb_threads = std::thread::hardware_concurrency();
+    XBT_INFO("Auto-setting contexts/nthreads to %d", nb_threads);
+  }
+  Context::parallel_contexts = nb_threads;
 }
 
-namespace simgrid {
-namespace kernel {
-namespace context {
+ContextFactory::~ContextFactory() = default;
 
-ContextFactoryInitializer factory_initializer = nullptr;
+e_xbt_parmap_mode_t Context::parallel_mode = XBT_PARMAP_DEFAULT;
+int Context::parallel_contexts             = 1;
+unsigned Context::stack_size;
+unsigned Context::guard_size;
+thread_local Context* Context::current_context_ = nullptr;
 
-ContextFactory::~ContextFactory() = default;
+/* Install or disable alternate signal stack, for SIGSEGV handler. */
+int Context::install_sigsegv_stack(bool enable)
+{
+  static std::vector<unsigned char> sigsegv_stack(SIGSTKSZ);
+  stack_t stack;
+  stack.ss_sp    = sigsegv_stack.data();
+  stack.ss_size  = sigsegv_stack.size();
+  stack.ss_flags = enable ? 0 : SS_DISABLE;
+  return sigaltstack(&stack, nullptr);
+}
 
-Context* ContextFactory::self()
+Context* Context::self()
 {
-  return SIMIX_context_get_current();
+  return current_context_;
+}
+void Context::set_current(Context* self)
+{
+  current_context_ = self;
 }
 
-void ContextFactory::declare_context(void* context, std::size_t size)
+void Context::declare_context(std::size_t size)
 {
-#if SIMGRID_HAVE_MC
   /* Store the address of the stack in heap to compare it apart of heap comparison */
-  if(MC_is_active())
-    MC_ignore_heap(context, size);
-#endif
+  MC_ignore_heap(this, size);
 }
 
-Context* ContextFactory::attach(void_pfn_smxprocess_t cleanup_func, smx_actor_t process)
+Context* ContextFactory::attach(actor::ActorImpl*)
 {
   xbt_die("Cannot attach with this ContextFactory.\n"
     "Try using --cfg=contexts/factory:thread instead.\n");
 }
 
-Context* ContextFactory::create_maestro(std::function<void()> code, smx_actor_t process)
+Context* ContextFactory::create_maestro(std::function<void()>&&, actor::ActorImpl*)
 {
   xbt_die("Cannot create_maestro with this ContextFactory.\n"
     "Try using --cfg=contexts/factory:thread instead.\n");
 }
 
-Context::Context(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t actor)
-    : code_(std::move(code)), actor_(actor)
+Context::Context(std::function<void()>&& code, actor::ActorImpl* actor, bool maestro)
+    : code_(std::move(code)), actor_(actor), is_maestro_(maestro)
 {
-  /* If the user provided a function for the process then use it.
-     Otherwise, it is the context for maestro and we should set it as the
-     current context */
-  if (has_code())
-    this->cleanup_func_ = cleanup_func;
-  else
-    SIMIX_context_set_current(this);
+  /* If we are creating maestro, we should set it as the current context */
+  if (maestro)
+    set_current(this);
 }
 
-Context::~Context() = default;
-
-void Context::stop()
-{
-  if (this->cleanup_func_)
-    this->cleanup_func_(this->actor_);
-  this->actor_->suspended_ = 0;
-
-  this->iwannadie = false;
-  simgrid::simix::simcall([this] { SIMIX_process_cleanup(this->actor_); });
-  this->iwannadie = true;
-}
-
-AttachContext::~AttachContext() = default;
-
-}}}
-
-/** @brief Executes all the processes to run (in parallel if possible). */
-void SIMIX_context_runall()
+Context::~Context()
 {
-  simix_global->context_factory->run_all();
+  if (self() == this)
+    set_current(nullptr);
 }
 
-/** @brief returns the current running context */
-smx_context_t SIMIX_context_self()
+void Context::stop()
 {
-  if (simix_global && simix_global->context_factory)
-    return simix_global->context_factory->self();
-  else
-    return nullptr;
+  this->actor_->cleanup_from_self();
+  sthread_disable();
+  throw ForcefulKillException(); // clean RAII variables with the dedicated exception
 }
+AttachContext::~AttachContext() = default;
 
+} // namespace simgrid::kernel::context