-/* Copyright (c) 2007-2017. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2007-2022. 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 "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"
+#include "src/sthread/sthread.h"
+#include "src/surf/surf_interface.hpp"
+
+#include <vector>
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ker_context, kernel, "Context switching mechanism");
+
+namespace simgrid::kernel::context {
+
+std::function<ContextFactory*(void)> ContextFactory::initializer;
+
+static e_xbt_parmap_mode_t parallel_synchronization_mode = XBT_PARMAP_DEFAULT;
+static int parallel_contexts = 1;
+unsigned stack_size;
+unsigned guard_size;
+
+/** @brief Returns whether some parallel threads are used for the user contexts. */
+bool is_parallel()
+{
+ return parallel_contexts > 1;
+}
/**
- * @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
+ * @brief Returns the number of parallel threads used for the user contexts.
+ * @return the number of threads (1 means no parallelism)
*/
-smx_context_t SIMIX_context_new(
- std::function<void()> code,
- void_pfn_smxprocess_t cleanup_func,
- smx_actor_t simix_process)
+int get_nthreads()
{
- 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);
+ return parallel_contexts;
}
-namespace simgrid {
-namespace kernel {
-namespace context {
+/**
+ * @brief Sets the number of parallel threads to use for the user contexts.
+ *
+ * This function should be called before initializing SIMIX.
+ * A value of 1 means no parallelism (1 thread only).
+ * If the value is greater than 1, the thread support must be enabled.
+ *
+ * @param nb_threads the number of threads to use
+ */
+void set_nthreads(int nb_threads)
+{
+ if (nb_threads <= 0) {
+ nb_threads = std::thread::hardware_concurrency();
+ XBT_INFO("Auto-setting contexts/nthreads to %d", nb_threads);
+ }
+ parallel_contexts = nb_threads;
+}
-ContextFactoryInitializer factory_initializer = nullptr;
+/**
+ * @brief Sets the synchronization mode to use when actors are run in parallel.
+ * @param mode how to synchronize threads if actors are run in parallel
+ */
+void set_parallel_mode(e_xbt_parmap_mode_t mode)
+{
+ parallel_synchronization_mode = mode;
+}
+
+/**
+ * @brief Returns the synchronization mode used when actors are run in parallel.
+ * @return how threads are synchronized if actors are run in parallel
+ */
+e_xbt_parmap_mode_t get_parallel_mode()
+{
+ return parallel_synchronization_mode;
+}
ContextFactory::~ContextFactory() = default;
-Context* ContextFactory::self()
+thread_local Context* Context::current_context_ = nullptr;
+
+#ifndef WIN32
+/* Install or disable alternate signal stack, for SIGSEGV handler. */
+int Context::install_sigsegv_stack(stack_t* old_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, old_stack);
+}
+#endif
+
+Context* Context::self()
+{
+ return current_context_;
+}
+void Context::set_current(Context* self)
{
- return SIMIX_context_get_current();
+ 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);
+ MC_ignore_heap(this, size);
#endif
}
-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 process)
- : code_(std::move(code)), process_(process), iwannadie(false)
+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()
+Context::~Context()
{
- if (this->cleanup_func_)
- this->cleanup_func_(this->process_);
- this->process_->suspended = 0;
-
- this->iwannadie = false;
- simcall_process_cleanup(this->process_);
- this->iwannadie = true;
+ if (self() == this)
+ set_current(nullptr);
}
-AttachContext::~AttachContext() = default;
-
-}}}
-
-/** @brief Executes all the processes to run (in parallel if possible). */
-void SIMIX_context_runall()
-{
- simix_global->context_factory->run_all();
-}
-
-/** @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
