-/* 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 "simgrid/s4u/Host.hpp"
#include "src/kernel/activity/CommImpl.hpp"
#include "src/kernel/context/Context.hpp"
-#include "src/simix/smx_private.hpp"
#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 {
namespace kernel {
namespace context {
ContextFactoryInitializer factory_initializer = nullptr;
+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. */
+int is_parallel()
+{
+ return parallel_contexts > 1;
+}
+
+/**
+ * @brief Returns the number of parallel threads used for the user contexts.
+ * @return the number of threads (1 means no parallelism)
+ */
+int get_nthreads()
+{
+ return parallel_contexts;
+}
+
+/**
+ * @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;
+}
+
+/**
+ * @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 Context* 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)
"Try using --cfg=contexts/factory:thread instead.\n");
}
-Context::Context(std::function<void()>&& code, actor::ActorImpl* 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 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);
}
} // namespace context
} // namespace kernel
} // namespace simgrid
-
-/** @brief Executes all the processes to run (in parallel if possible). */
-void SIMIX_context_runall()
-{
- simix_global->context_factory->run_all();
-}