1 /* Copyright (c) 2009-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "src/kernel/context/ContextThread.hpp"
8 #include "simgrid/Exception.hpp"
9 #include "src/internal_config.h" /* loads context system definitions */
10 #include "src/simix/smx_private.hpp"
11 #include "src/xbt_modinter.h" /* prototype of os thread module's init/exit in XBT */
12 #include "xbt/function_types.h"
17 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
23 // ThreadContextFactory
25 ThreadContextFactory::ThreadContextFactory() : ContextFactory(), parallel_(SIMIX_context_is_parallel())
28 ParallelThreadContext::initialize();
31 ThreadContextFactory::~ThreadContextFactory()
34 ParallelThreadContext::finalize();
37 ThreadContext* ThreadContextFactory::create_context(std::function<void()> code, smx_actor_t actor, bool maestro)
40 return this->new_context<ParallelThreadContext>(std::move(code), actor, maestro);
42 return this->new_context<SerialThreadContext>(std::move(code), actor, maestro);
45 void ThreadContextFactory::run_all()
49 ParallelThreadContext::run_all();
52 SerialThreadContext::run_all();
58 ThreadContext::ThreadContext(std::function<void()> code, smx_actor_t actor, bool maestro)
59 : AttachContext(std::move(code), actor), is_maestro_(maestro)
61 /* If the user provided a function for the actor then use it */
63 /* create and start the actor */
64 this->thread_ = new std::thread(ThreadContext::wrapper, this);
65 /* wait the starting of the newly created actor */
69 /* Otherwise, we attach to the current thread */
71 Context::set_current(this);
75 ThreadContext::~ThreadContext()
77 if (this->thread_) { /* Maestro don't have any thread */
83 void *ThreadContext::wrapper(void *param)
85 ThreadContext* context = static_cast<ThreadContext*>(param);
86 Context::set_current(context);
89 /* Install alternate signal stack, for SIGSEGV handler. */
91 stack.ss_sp = sigsegv_stack;
92 stack.ss_size = sizeof sigsegv_stack;
94 sigaltstack(&stack, nullptr);
96 // Tell the caller (normally the maestro) we are starting, and wait for its green light
97 context->end_.release();
102 if (not context->is_maestro()) { // Just in case somebody detached maestro
103 context->Context::stop();
104 context->stop_hook();
106 } catch (StopRequest const&) {
107 XBT_DEBUG("Caught a StopRequest in Thread::wrapper");
108 xbt_assert(not context->is_maestro(), "Maestro shall not receive StopRequests, even when detached.");
109 } catch (simgrid::Exception const& e) {
110 XBT_INFO("Actor killed by an uncatched exception %s", simgrid::xbt::demangle(typeid(e).name()).get());
113 // Signal to the caller (normally the maestro) that we have finished:
117 stack.ss_flags = SS_DISABLE;
118 sigaltstack(&stack, nullptr);
120 XBT_DEBUG("Terminating");
121 Context::set_current(nullptr);
125 void ThreadContext::release()
127 this->begin_.release();
130 void ThreadContext::wait()
132 this->end_.acquire();
135 void ThreadContext::start()
137 this->begin_.acquire();
141 void ThreadContext::yield()
144 this->end_.release();
147 void ThreadContext::stop()
154 void ThreadContext::suspend()
160 void ThreadContext::attach_start()
162 // We're breaking the layers here by depending on the upper layer:
163 ThreadContext* maestro = (ThreadContext*)simix_global->maestro_process->context_;
164 maestro->begin_.release();
165 xbt_assert(not this->is_maestro());
169 void ThreadContext::attach_stop()
171 xbt_assert(not this->is_maestro());
174 ThreadContext* maestro = (ThreadContext*)simix_global->maestro_process->context_;
175 maestro->end_.acquire();
177 Context::set_current(nullptr);
180 // SerialThreadContext
182 void SerialThreadContext::run_all()
184 for (smx_actor_t const& actor : simix_global->actors_to_run) {
185 XBT_DEBUG("Handling %p", actor);
186 ThreadContext* context = static_cast<ThreadContext*>(actor->context_);
192 // ParallelThreadContext
194 xbt::OsSemaphore* ParallelThreadContext::thread_sem_ = nullptr;
196 void ParallelThreadContext::initialize()
198 thread_sem_ = new xbt::OsSemaphore(SIMIX_context_get_nthreads());
201 void ParallelThreadContext::finalize()
204 thread_sem_ = nullptr;
207 void ParallelThreadContext::run_all()
209 for (smx_actor_t const& actor : simix_global->actors_to_run)
210 static_cast<ThreadContext*>(actor->context_)->release();
211 for (smx_actor_t const& actor : simix_global->actors_to_run)
212 static_cast<ThreadContext*>(actor->context_)->wait();
215 void ParallelThreadContext::start_hook()
217 if (not is_maestro()) /* parallel run */
218 thread_sem_->acquire();
221 void ParallelThreadContext::yield_hook()
223 if (not is_maestro()) /* parallel run */
224 thread_sem_->release();
227 XBT_PRIVATE ContextFactory* thread_factory()
229 XBT_VERB("Activating thread context factory");
230 return new ThreadContextFactory();