-/* Copyright (c) 2015-2017. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2015-2018. 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 <cstdint>
-
-#include <functional>
-#include <utility>
-#include <vector>
-
-#include <boost/context/all.hpp>
-
-#include <xbt/log.h>
-#include <xbt/xbt_os_thread.h>
-
+#include "ContextBoost.hpp"
+#include "context_private.hpp"
#include "src/simix/smx_private.hpp"
-#include "src/internal_config.h"
-#include "src/kernel/context/ContextBoost.hpp"
-
-#if HAVE_SANITIZE_ADDRESS_FIBER_SUPPORT
-#include <sanitizer/asan_interface.h>
-#define ASAN_EVAL(expr) (expr)
-#define ASAN_START_SWITCH(fake_stack_save, bottom, size) __sanitizer_start_switch_fiber(fake_stack_save, bottom, size)
-#define ASAN_FINISH_SWITCH(fake_stack_save, bottom_old, size_old) \
- __sanitizer_finish_switch_fiber(fake_stack_save, bottom_old, size_old)
-#else
-#define ASAN_EVAL(expr) (void)0
-#define ASAN_START_SWITCH(fake_stack_save, bottom, size) (void)0
-#define ASAN_FINISH_SWITCH(fake_stack_save, bottom_old, size_old) (void)(fake_stack_save)
-#endif
XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
namespace kernel {
namespace context {
-class BoostSerialContext : public BoostContext {
-public:
- BoostSerialContext(std::function<void()> code,
- void_pfn_smxprocess_t cleanup_func,
- smx_actor_t process)
- : BoostContext(std::move(code), cleanup_func, process) {}
- void suspend() override;
-};
-
-#if HAVE_THREAD_CONTEXTS
-class BoostParallelContext : public BoostContext {
-public:
- BoostParallelContext(std::function<void()> code,
- void_pfn_smxprocess_t cleanup_func,
- smx_actor_t process)
- : BoostContext(std::move(code), cleanup_func, process) {}
- void suspend() override;
- void resume() override;
-};
-#endif
-
// BoostContextFactory
-bool BoostContext::parallel_ = false;
-simgrid::xbt::Parmap<smx_actor_t>* BoostContext::parmap_ = nullptr;
-uintptr_t BoostContext::threads_working_ = 0;
-xbt_os_thread_key_t BoostContext::worker_id_key_;
-unsigned long BoostContext::process_index_ = 0;
-BoostContext* BoostContext::maestro_context_ = nullptr;
-std::vector<BoostContext*> BoostContext::workers_context_;
-
BoostContextFactory::BoostContextFactory()
- : ContextFactory("BoostContextFactory")
+ : ContextFactory("BoostContextFactory"), parallel_(SIMIX_context_is_parallel())
{
- BoostContext::parallel_ = SIMIX_context_is_parallel();
- if (BoostContext::parallel_) {
+ BoostContext::setMaestro(nullptr);
+ if (parallel_) {
#if HAVE_THREAD_CONTEXTS
- BoostContext::parmap_ = nullptr;
- BoostContext::workers_context_.clear();
- BoostContext::workers_context_.resize(SIMIX_context_get_nthreads(), nullptr);
- BoostContext::maestro_context_ = nullptr;
- xbt_os_thread_key_create(&BoostContext::worker_id_key_);
+ ParallelBoostContext::initialize();
#else
xbt_die("No thread support for parallel context execution");
#endif
BoostContextFactory::~BoostContextFactory()
{
#if HAVE_THREAD_CONTEXTS
- delete BoostContext::parmap_;
- BoostContext::parmap_ = nullptr;
- BoostContext::workers_context_.clear();
+ if (parallel_)
+ ParallelBoostContext::finalize();
#endif
}
smx_context_t BoostContextFactory::create_context(std::function<void()> code, void_pfn_smxprocess_t cleanup_func,
smx_actor_t process)
{
- BoostContext* context = nullptr;
- if (BoostContext::parallel_)
#if HAVE_THREAD_CONTEXTS
- context = this->new_context<BoostParallelContext>(std::move(code), cleanup_func, process);
-#else
- xbt_die("No support for parallel execution");
+ if (parallel_)
+ return this->new_context<ParallelBoostContext>(std::move(code), cleanup_func, process);
#endif
- else
- context = this->new_context<BoostSerialContext>(std::move(code), cleanup_func, process);
- return context;
+
+ return this->new_context<SerialBoostContext>(std::move(code), cleanup_func, process);
}
void BoostContextFactory::run_all()
{
#if HAVE_THREAD_CONTEXTS
- if (BoostContext::parallel_) {
- BoostContext::threads_working_ = 0;
- if (not BoostContext::parmap_)
- BoostContext::parmap_ =
- new simgrid::xbt::Parmap<smx_actor_t>(SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode());
- BoostContext::parmap_->apply(
- [](smx_actor_t process) {
- BoostContext* context = static_cast<BoostContext*>(process->context);
- return context->resume();
- },
- simix_global->process_to_run);
- } else
+ if (parallel_)
+ ParallelBoostContext::run_all();
+ else
#endif
- {
- if (simix_global->process_to_run.empty())
- return;
- smx_actor_t first_process = simix_global->process_to_run.front();
- BoostContext::process_index_ = 1;
- /* execute the first process */
- static_cast<BoostContext*>(first_process->context)->resume();
- }
+ SerialBoostContext::run_all();
}
-
// BoostContext
-void BoostContext::smx_ctx_boost_wrapper(BoostContext::ctx_arg_type arg)
-{
-#if BOOST_VERSION < 106100
- BoostContext* context = reinterpret_cast<BoostContext*>(arg);
-#else
- ASAN_FINISH_SWITCH(nullptr, &static_cast<BoostContext**>(arg.data)[0]->asan_stack_,
- &static_cast<BoostContext**>(arg.data)[0]->asan_stack_size_);
- static_cast<BoostContext**>(arg.data)[0]->fc_ = arg.fctx;
- BoostContext* context = static_cast<BoostContext**>(arg.data)[1];
-#endif
- try {
- (*context)();
- context->Context::stop();
- } catch (StopRequest const&) {
- XBT_DEBUG("Caught a StopRequest");
- }
- ASAN_EVAL(context->asan_stop_ = true);
- context->suspend();
-}
-
-inline void BoostContext::smx_ctx_boost_jump_fcontext(BoostContext* from, BoostContext* to)
-{
-#if BOOST_VERSION < 105600
- boost::context::jump_fcontext(from->fc_, to->fc_, reinterpret_cast<intptr_t>(to));
-#elif BOOST_VERSION < 106100
- boost::context::jump_fcontext(&from->fc_, to->fc_, reinterpret_cast<intptr_t>(to));
-#else
- BoostContext* ctx[2] = {from, to};
- void* fake_stack;
- ASAN_START_SWITCH(from->asan_stop_ ? nullptr : &fake_stack, to->asan_stack_, to->asan_stack_size_);
- boost::context::detail::transfer_t arg = boost::context::detail::jump_fcontext(to->fc_, ctx);
- ASAN_FINISH_SWITCH(fake_stack, &static_cast<BoostContext**>(arg.data)[0]->asan_stack_,
- &static_cast<BoostContext**>(arg.data)[0]->asan_stack_size_);
- static_cast<BoostContext**>(arg.data)[0]->fc_ = arg.fctx;
-#endif
-}
+BoostContext* BoostContext::maestro_context_ = nullptr;
-BoostContext::BoostContext(std::function<void()> code,
- void_pfn_smxprocess_t cleanup_func, smx_actor_t process)
- : Context(std::move(code), cleanup_func, process)
+BoostContext::BoostContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process)
+ : Context(std::move(code), cleanup_func, process)
{
/* if the user provided a function for the process then use it, otherwise it is the context for maestro */
if (has_code()) {
this->stack_ = SIMIX_context_stack_new();
-// We need to pass the bottom of the stack to make_fcontext, depending on the stack direction it may be the lower
-// or higher address:
+ /* We need to pass the bottom of the stack to make_fcontext,
+ depending on the stack direction it may be the lower or higher address: */
#if PTH_STACKGROWTH == -1
void* stack = static_cast<char*>(this->stack_) + smx_context_usable_stack_size;
#else
void* stack = this->stack_;
#endif
- ASAN_EVAL(this->asan_stack_ = stack);
+ ASAN_ONLY(this->asan_stack_ = stack);
#if BOOST_VERSION < 106100
- this->fc_ = boost::context::make_fcontext(stack, smx_context_usable_stack_size, smx_ctx_boost_wrapper);
+ this->fc_ = boost::context::make_fcontext(stack, smx_context_usable_stack_size, BoostContext::wrapper);
#else
- this->fc_ = boost::context::detail::make_fcontext(stack, smx_context_usable_stack_size, smx_ctx_boost_wrapper);
+ this->fc_ = boost::context::detail::make_fcontext(stack, smx_context_usable_stack_size, BoostContext::wrapper);
#endif
} else {
#if BOOST_VERSION < 105600
SIMIX_context_stack_delete(this->stack_);
}
-// BoostSerialContext
+void BoostContext::wrapper(BoostContext::arg_type arg)
+{
+#if BOOST_VERSION < 106100
+ BoostContext* context = reinterpret_cast<BoostContext*>(arg);
+#else
+ BoostContext* context = static_cast<BoostContext**>(arg.data)[1];
+ ASAN_ONLY(xbt_assert(context->asan_ctx_ == static_cast<BoostContext**>(arg.data)[0]));
+ ASAN_FINISH_SWITCH(nullptr, &context->asan_ctx_->asan_stack_, &context->asan_ctx_->asan_stack_size_);
+ static_cast<BoostContext**>(arg.data)[0]->fc_ = arg.fctx;
+#endif
+ try {
+ (*context)();
+ context->Context::stop();
+ } catch (StopRequest const&) {
+ XBT_DEBUG("Caught a StopRequest");
+ }
+ ASAN_ONLY(context->asan_stop_ = true);
+ context->suspend();
+}
+
+inline void BoostContext::swap(BoostContext* from, BoostContext* to)
+{
+#if BOOST_VERSION < 105600
+ boost::context::jump_fcontext(from->fc_, to->fc_, reinterpret_cast<intptr_t>(to));
+#elif BOOST_VERSION < 106100
+ boost::context::jump_fcontext(&from->fc_, to->fc_, reinterpret_cast<intptr_t>(to));
+#else
+ BoostContext* ctx[2] = {from, to};
+ void* fake_stack = nullptr;
+ ASAN_ONLY(to->asan_ctx_ = from);
+ ASAN_START_SWITCH(from->asan_stop_ ? nullptr : &fake_stack, to->asan_stack_, to->asan_stack_size_);
+ boost::context::detail::transfer_t arg = boost::context::detail::jump_fcontext(to->fc_, ctx);
+ ASAN_ONLY(xbt_assert(from->asan_ctx_ == static_cast<BoostContext**>(arg.data)[0]));
+ ASAN_FINISH_SWITCH(fake_stack, &from->asan_ctx_->asan_stack_, &from->asan_ctx_->asan_stack_size_);
+ static_cast<BoostContext**>(arg.data)[0]->fc_ = arg.fctx;
+#endif
+}
void BoostContext::stop()
{
throw StopRequest();
}
-void BoostContext::resume()
-{
- SIMIX_context_set_current(this);
- smx_ctx_boost_jump_fcontext(maestro_context_, this);
-}
+// SerialBoostContext
+
+unsigned long SerialBoostContext::process_index_;
-void BoostSerialContext::suspend()
+void SerialBoostContext::suspend()
{
/* determine the next context */
- BoostSerialContext* next_context;
+ SerialBoostContext* next_context;
unsigned long int i = process_index_;
process_index_++;
if (i < simix_global->process_to_run.size()) {
/* execute the next process */
XBT_DEBUG("Run next process");
- next_context = static_cast<BoostSerialContext*>(simix_global->process_to_run[i]->context);
+ next_context = static_cast<SerialBoostContext*>(simix_global->process_to_run[i]->context);
} else {
/* all processes were run, return to maestro */
XBT_DEBUG("No more process to run");
- next_context = static_cast<BoostSerialContext*>(maestro_context_);
+ next_context = static_cast<SerialBoostContext*>(BoostContext::getMaestro());
}
- SIMIX_context_set_current(static_cast<smx_context_t>(next_context));
- smx_ctx_boost_jump_fcontext(this, next_context);
+ SIMIX_context_set_current(next_context);
+ BoostContext::swap(this, next_context);
+}
+
+void SerialBoostContext::resume()
+{
+ SIMIX_context_set_current(this);
+ BoostContext::swap(BoostContext::getMaestro(), this);
+}
+
+void SerialBoostContext::run_all()
+{
+ if (simix_global->process_to_run.empty())
+ return;
+ smx_actor_t first_process = simix_global->process_to_run.front();
+ process_index_ = 1;
+ /* execute the first process */
+ static_cast<SerialBoostContext*>(first_process->context)->resume();
}
-// BoostParallelContext
+// ParallelBoostContext
#if HAVE_THREAD_CONTEXTS
-void BoostParallelContext::suspend()
+simgrid::xbt::Parmap<smx_actor_t>* ParallelBoostContext::parmap_;
+std::atomic<uintptr_t> ParallelBoostContext::threads_working_;
+xbt_os_thread_key_t ParallelBoostContext::worker_id_key_;
+std::vector<ParallelBoostContext*> ParallelBoostContext::workers_context_;
+
+void ParallelBoostContext::initialize()
+{
+ parmap_ = nullptr;
+ workers_context_.clear();
+ workers_context_.resize(SIMIX_context_get_nthreads(), nullptr);
+ xbt_os_thread_key_create(&worker_id_key_);
+}
+
+void ParallelBoostContext::finalize()
+{
+ delete parmap_;
+ parmap_ = nullptr;
+ workers_context_.clear();
+ xbt_os_thread_key_destroy(worker_id_key_);
+}
+
+void ParallelBoostContext::run_all()
+{
+ threads_working_ = 0;
+ if (parmap_ == nullptr)
+ parmap_ = new simgrid::xbt::Parmap<smx_actor_t>(SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode());
+ parmap_->apply(
+ [](smx_actor_t process) {
+ ParallelBoostContext* context = static_cast<ParallelBoostContext*>(process->context);
+ context->resume();
+ },
+ simix_global->process_to_run);
+}
+
+void ParallelBoostContext::suspend()
{
boost::optional<smx_actor_t> next_work = parmap_->next();
- BoostParallelContext* next_context;
+ ParallelBoostContext* next_context;
if (next_work) {
XBT_DEBUG("Run next process");
- next_context = static_cast<BoostParallelContext*>(next_work.get()->context);
+ next_context = static_cast<ParallelBoostContext*>(next_work.get()->context);
} else {
XBT_DEBUG("No more processes to run");
uintptr_t worker_id = reinterpret_cast<uintptr_t>(xbt_os_thread_get_specific(worker_id_key_));
- next_context = static_cast<BoostParallelContext*>(workers_context_[worker_id]);
+ next_context = workers_context_[worker_id];
}
- SIMIX_context_set_current(static_cast<smx_context_t>(next_context));
- smx_ctx_boost_jump_fcontext(this, next_context);
+ SIMIX_context_set_current(next_context);
+ BoostContext::swap(this, next_context);
}
-void BoostParallelContext::resume()
+void ParallelBoostContext::resume()
{
- uintptr_t worker_id = __sync_fetch_and_add(&threads_working_, 1);
+ uintptr_t worker_id = threads_working_.fetch_add(1, std::memory_order_relaxed);
xbt_os_thread_set_specific(worker_id_key_, reinterpret_cast<void*>(worker_id));
- BoostParallelContext* worker_context = static_cast<BoostParallelContext*>(SIMIX_context_self());
- workers_context_[worker_id] = worker_context;
+ ParallelBoostContext* worker_context = static_cast<ParallelBoostContext*>(SIMIX_context_self());
+ workers_context_[worker_id] = worker_context;
SIMIX_context_set_current(this);
- smx_ctx_boost_jump_fcontext(worker_context, this);
+ BoostContext::swap(worker_context, this);
}
#endif
XBT_VERB("Using Boost contexts. Welcome to the 21th century.");
return new BoostContextFactory();
}
-
}}} // namespace
