namespace context {
// UContextFactory
-
-UContextFactory::UContextFactory() : ContextFactory("UContextFactory"), parallel_(SIMIX_context_is_parallel())
-{
- UContext::set_maestro(nullptr);
- if (parallel_)
- SwappedContext::initialize();
-}
-
-UContextFactory::~UContextFactory()
-{
- if (parallel_)
- SwappedContext::finalize();
-}
-
Context* UContextFactory::create_context(std::function<void()> code, void_pfn_smxprocess_t cleanup, smx_actor_t process)
{
- if (parallel_)
- return new_context<ParallelUContext>(std::move(code), cleanup, process);
- else
- return new_context<UContext>(std::move(code), cleanup, process);
+ return new_context<UContext>(std::move(code), cleanup, process, this);
}
-/* This function is called by maestro at the beginning of a scheduling round to get all working threads executing some
- * stuff It is much easier to understand what happens if you see the working threads as bodies that swap their soul for
- * the ones of the simulated processes that must run.
- */
-void UContextFactory::run_all()
-{
- if (parallel_)
- ParallelUContext::run_all();
- else
- SwappedContext::run_all();
-}
// UContext
-UContext::UContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process)
- : SwappedContext(std::move(code), cleanup_func, process)
+UContext::UContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process,
+ SwappedContextFactory* factory)
+ : SwappedContext(std::move(code), cleanup_func, process, factory)
{
/* if the user provided a function for the process then use it, otherwise it is the context for maestro */
if (has_code()) {
#endif
}
-UContext::~UContext() = default;
-
// The name of this function is currently hardcoded in the code (as string).
// Do not change it without fixing those references as well.
void UContext::smx_ctx_sysv_wrapper(int i1, int i2)
ASAN_FINISH_SWITCH(fake_stack, &from->asan_ctx_->asan_stack_, &from->asan_ctx_->asan_stack_size_);
}
-void UContext::stop()
-{
- Context::stop();
- throw StopRequest();
-}
-
-// ParallelUContext
-
-void ParallelUContext::run_all()
-{
- threads_working_ = 0;
-
- // We lazily create the parmap so that all options are actually processed when doing so.
- if (parmap_ == nullptr)
- parmap_ = new simgrid::xbt::Parmap<smx_actor_t>(SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode());
-
- // Usually, Parmap::apply() executes the provided function on all elements of the array.
- // Here, the executed function does not return the control to the parmap before all the array is processed:
- // - suspend() should switch back to the worker_context (either maestro or one of its minions) to return
- // the control to the parmap. Instead, it uses parmap_->next() to steal another work, and does it directly.
- // It only yields back to worker_context when the work array is exhausted.
- // - So, resume() is only launched from the parmap for the first job of each minion.
- parmap_->apply(
- [](smx_actor_t process) {
- ParallelUContext* context = static_cast<ParallelUContext*>(process->context_);
- context->resume();
- },
- simix_global->process_to_run);
-}
-
-/** Run one particular simulated process on the current thread.
- *
- * Only applied to the N first elements of the parmap array, where N is the amount of worker threads in the parmap.
- * See ParallelUContext::run_all for details.
- */
-void ParallelUContext::resume()
-{
- // Save the thread number (my body) in an os-thread-specific area
- worker_id_ = threads_working_.fetch_add(1, std::memory_order_relaxed);
- // Save my current soul (either maestro, or one of the minions) in a permanent area
- SwappedContext* worker_context = static_cast<SwappedContext*>(self());
- workers_context_[worker_id_] = worker_context;
- // Switch my soul and the actor's one
- Context::set_current(this);
- worker_context->swap_into(this);
- // No body runs that soul anymore at this point, but it is stored in a safe place.
- // When the executed actor will do a blocking action, SIMIX_process_yield() will call suspend(), below.
-}
-
-/** Yield
- *
- * This function is called when a simulated process wants to yield back to the maestro in a blocking simcall,
- * ie in SIMIX_process_yield().
- *
- * Actually, it does not really yield back to maestro, but directly into the next executable actor.
- *
- * This makes the parmap::apply awkward (see ParallelUContext::run_all()) because it only apply regularly
- * on the few first elements of the array, but it saves a lot of context switches back to maestro,
- * and directly forth to the next executable actor.
- */
-void ParallelUContext::suspend()
-{
- // Get some more work to directly swap into the next executable actor instead of yielding back to the parmap
- boost::optional<smx_actor_t> next_work = parmap_->next();
- SwappedContext* next_context;
- if (next_work) {
- // There is a next soul to embody (ie, another executable actor)
- XBT_DEBUG("Run next process");
- next_context = static_cast<ParallelUContext*>(next_work.get()->context_);
- } else {
- // All actors were run, go back to the parmap context
- XBT_DEBUG("No more processes to run");
- // worker_id_ is the identity of my body, stored in thread_local when starting the scheduling round
- next_context = workers_context_[worker_id_];
- // When given that soul, the body will wait for the next scheduling round
- }
-
- // Get the next soul to run, either from another actor or the initial minion's one
- Context::set_current(next_context);
- this->swap_into(next_context);
-}
XBT_PRIVATE ContextFactory* sysv_factory()
{
