-/* Copyright (c) 2007-2019. 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"
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
+#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
- * @param simix_process
+ * @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()
{
- 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;
-static thread_local smx_context_t smx_current_context = nullptr;
+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 smx_current_context;
+ return current_context_;
}
void Context::set_current(Context* self)
{
- smx_current_context = self;
+ current_context_ = self;
}
void Context::declare_context(std::size_t size)
#endif
}
-Context* ContextFactory::attach(void_pfn_smxprocess_t, smx_actor_t)
+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()>, smx_actor_t)
+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)), cleanup_func_(cleanup_func), actor_(actor)
+Context::Context(std::function<void()>&& code, actor::ActorImpl* actor, bool maestro)
+ : code_(std::move(code)), actor_(actor), is_maestro_(maestro)
{
- /* If no function was provided, this is the context for maestro
- * and we should set it as the current context */
- if (not has_code())
+ /* If we are creating maestro, we should set it as the current context */
+ if (maestro)
set_current(this);
}
void Context::stop()
{
- actor_->finished_ = true;
-
- if (actor_->auto_restart_ && actor_->host_->is_off()) {
- XBT_DEBUG("Insert host %s to watched_hosts because it's off and %s needs to restart", actor_->host_->get_cname(),
- actor_->get_cname());
- watched_hosts.insert(actor_->host_->get_cname());
- }
-
- actor_->finished_ = true;
-
- // Execute the termination callbacks
- smx_process_exit_status_t exit_status = (actor_->context_->iwannadie) ? SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS;
- while (not actor_->on_exit.empty()) {
- s_smx_process_exit_fun_t exit_fun = actor_->on_exit.back();
- actor_->on_exit.pop_back();
- (exit_fun.fun)(exit_status, exit_fun.arg);
- }
-
- /* cancel non-blocking activities */
- for (auto activity : actor_->comms)
- boost::static_pointer_cast<activity::CommImpl>(activity)->cancel();
- actor_->comms.clear();
-
- XBT_DEBUG("%s@%s(%ld) should not run anymore", actor_->get_cname(), actor_->iface()->get_host()->get_cname(),
- actor_->pid_);
-
- if (this->cleanup_func_)
- this->cleanup_func_(this->actor_);
-
- this->iwannadie = false; // don't let the simcall's yield() do a Context::stop(), because that's me
- simgrid::simix::simcall([this] {
- simgrid::s4u::Actor::on_destruction(actor_->iface());
- SIMIX_process_cleanup(actor_);
- });
- this->iwannadie = true;
+ this->actor_->cleanup_from_self();
+ sthread_disable();
+ throw ForcefulKillException(); // clean RAII variables with the dedicated exception
}
-
AttachContext::~AttachContext() = default;
-StopRequest::~StopRequest() = default;
-
-void StopRequest::do_throw()
-{
- throw StopRequest();
-}
-
-bool StopRequest::try_n_catch(std::function<void(void)> try_block)
-{
- bool res;
- try {
- try_block();
- res = true;
- } catch (StopRequest const&) {
- XBT_DEBUG("Caught a StopRequest");
- res = false;
- }
- return res;
-}
-}}}
-
-/** @brief Executes all the processes to run (in parallel if possible). */
-void SIMIX_context_runall()
-{
- simix_global->context_factory->run_all();
-}
+} // namespace simgrid::kernel::context
