1 /* Copyright (c) 2009-2018. 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"
13 #include "xbt/xbt_os_thread.h"
18 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
24 // ThreadContextFactory
26 ThreadContextFactory::ThreadContextFactory()
27 : ContextFactory("ThreadContextFactory"), parallel_(SIMIX_context_is_parallel())
30 ParallelThreadContext::initialize();
33 ThreadContextFactory::~ThreadContextFactory()
36 ParallelThreadContext::finalize();
39 ThreadContext* ThreadContextFactory::create_context(std::function<void()> code, void_pfn_smxprocess_t cleanup,
40 smx_actor_t process, bool maestro)
43 return this->new_context<ParallelThreadContext>(std::move(code), cleanup, process, maestro);
45 return this->new_context<SerialThreadContext>(std::move(code), cleanup, process, maestro);
48 void ThreadContextFactory::run_all()
52 ParallelThreadContext::run_all();
55 SerialThreadContext::run_all();
61 ThreadContext::ThreadContext(std::function<void()> code, void_pfn_smxprocess_t cleanup, smx_actor_t actor, bool maestro)
62 : AttachContext(std::move(code), cleanup, actor), is_maestro_(maestro)
64 /* If the user provided a function for the process then use it */
66 if (smx_context_stack_size_was_set)
67 xbt_os_thread_setstacksize(smx_context_stack_size);
68 if (smx_context_guard_size_was_set)
69 xbt_os_thread_setguardsize(smx_context_guard_size);
71 /* create and start the process */
72 this->thread_ = xbt_os_thread_create(ThreadContext::wrapper, this);
73 /* wait the starting of the newly created process */
77 /* Otherwise, we attach to the current thread */
79 SIMIX_context_set_current(this);
83 ThreadContext::~ThreadContext()
85 if (this->thread_) /* If there is a thread (maestro don't have any), wait for its termination */
86 xbt_os_thread_join(this->thread_, nullptr);
89 void *ThreadContext::wrapper(void *param)
91 ThreadContext* context = static_cast<ThreadContext*>(param);
92 SIMIX_context_set_current(context);
95 /* Install alternate signal stack, for SIGSEGV handler. */
97 stack.ss_sp = sigsegv_stack;
98 stack.ss_size = sizeof sigsegv_stack;
100 sigaltstack(&stack, nullptr);
102 // Tell the caller (normally the maestro) we are starting, and wait for its green light
103 context->end_.release();
108 } catch (StopRequest const&) {
109 XBT_DEBUG("Caught a StopRequest");
110 xbt_assert(not context->is_maestro(), "Maestro shall not receive StopRequests, even when detached.");
111 } catch (simgrid::Exception const& e) {
112 XBT_INFO("Actor killed by an uncatched exception %s", simgrid::xbt::demangle(typeid(e).name()).get());
115 if (not context->is_maestro()) // Just in case somebody detached maestro
116 context->Context::stop();
118 // Signal to the caller (normally the maestro) that we have finished:
122 stack.ss_flags = SS_DISABLE;
123 sigaltstack(&stack, nullptr);
128 void ThreadContext::release()
130 this->begin_.release();
133 void ThreadContext::wait()
135 this->end_.acquire();
138 void ThreadContext::start()
140 this->begin_.acquire();
144 void ThreadContext::yield()
147 this->end_.release();
150 void ThreadContext::stop()
156 void ThreadContext::suspend()
162 void ThreadContext::attach_start()
164 // We're breaking the layers here by depending on the upper layer:
165 ThreadContext* maestro = (ThreadContext*)simix_global->maestro_process->context_;
166 maestro->begin_.release();
167 xbt_assert(not this->is_maestro());
171 void ThreadContext::attach_stop()
173 xbt_assert(not this->is_maestro());
176 ThreadContext* maestro = (ThreadContext*)simix_global->maestro_process->context_;
177 maestro->end_.acquire();
179 SIMIX_context_set_current(nullptr);
182 // SerialThreadContext
184 void SerialThreadContext::run_all()
186 for (smx_actor_t const& process : simix_global->process_to_run) {
187 XBT_DEBUG("Handling %p", process);
188 ThreadContext* context = static_cast<ThreadContext*>(process->context_);
194 // ParallelThreadContext
196 xbt::OsSemaphore* ParallelThreadContext::thread_sem_ = nullptr;
198 void ParallelThreadContext::initialize()
200 thread_sem_ = new xbt::OsSemaphore(SIMIX_context_get_nthreads());
203 void ParallelThreadContext::finalize()
206 thread_sem_ = nullptr;
209 void ParallelThreadContext::run_all()
211 for (smx_actor_t const& process : simix_global->process_to_run)
212 static_cast<ThreadContext*>(process->context_)->release();
213 for (smx_actor_t const& process : simix_global->process_to_run)
214 static_cast<ThreadContext*>(process->context_)->wait();
217 void ParallelThreadContext::start_hook()
219 if (not is_maestro()) /* parallel run */
220 thread_sem_->acquire();
223 void ParallelThreadContext::yield_hook()
225 if (not is_maestro()) /* parallel run */
226 thread_sem_->release();
229 XBT_PRIVATE ContextFactory* thread_factory()
231 XBT_VERB("Activating thread context factory");
232 return new ThreadContextFactory();