-/* Copyright (c) 2009-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2009-2017. 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 <math.h>
+#include "ContextRaw.hpp"
-#include <utility>
-#include <functional>
-
-#include "src/internal_config.h"
-
-#include "xbt/log.h"
-#include "xbt/parmap.h"
-#include "xbt/dynar.h"
-
-#include "src/simix/smx_private.h"
#include "mc/mc.h"
+#include "src/internal_config.h"
+#include "xbt/parmap.hpp"
XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-// ***** Class definitions
-
-namespace simgrid {
-namespace kernel {
-namespace context {
-
-class RawContext;
-class RawContextFactory;
-
-/** @brief Fast context switching inspired from SystemV ucontexts.
- *
- * The main difference to the System V context is that Raw Contexts are much faster because they don't
- * preserve the signal mask when switching. This saves a system call (at least on Linux) on each context switch.
- */
-class RawContext : public Context {
-protected:
- void* stack_ = nullptr;
- /** pointer to top the stack stack */
- void* stack_top_ = nullptr;
-public:
- friend class RawContextFactory;
- RawContext(std::function<void()> code,
- void_pfn_smxprocess_t cleanup_func,
- smx_actor_t process);
- ~RawContext() override;
-public:
- static void wrapper(void* arg);
- void stop() override;
- void suspend() override;
- void resume();
-private:
- void suspend_serial();
- void suspend_parallel();
- void resume_serial();
- void resume_parallel();
-};
-
-class RawContextFactory : public ContextFactory {
-public:
- RawContextFactory();
- ~RawContextFactory() override;
- RawContext* create_context(std::function<void()> code,
- void_pfn_smxprocess_t cleanup, smx_actor_t process) override;
- void run_all() override;
-private:
- void run_all_adaptative();
- void run_all_serial();
- void run_all_parallel();
-};
-
-ContextFactory* raw_factory()
-{
- XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us.");
- return new RawContextFactory();
-}
-
-}}} // namespace
-
// ***** Loads of static stuff
#if HAVE_THREAD_CONTEXTS
-static xbt_parmap_t raw_parmap;
+static simgrid::xbt::Parmap<smx_actor_t>* raw_parmap;
static simgrid::kernel::context::RawContext** raw_workers_context; /* space to save the worker context in each thread */
static uintptr_t raw_threads_working; /* number of threads that have started their work */
static xbt_os_thread_key_t raw_worker_id_key; /* thread-specific storage for the thread id */
xbt_os_thread_key_create(&raw_worker_id_key);
// TODO, lazily init
raw_parmap = nullptr;
- raw_workers_context = xbt_new(RawContext*, nthreads);
+ raw_workers_context = new RawContext*[nthreads];
raw_maestro_context = nullptr;
#endif
- // TODO, if(SIMIX_context_get_parallel_threshold() > 1) => choose dynamically
+ // TODO: choose dynamically when SIMIX_context_get_parallel_threshold() > 1
}
}
RawContextFactory::~RawContextFactory()
{
#if HAVE_THREAD_CONTEXTS
- if (raw_parmap)
- xbt_parmap_destroy(raw_parmap);
- xbt_free(raw_workers_context);
+ delete raw_parmap;
+ delete[] raw_workers_context;
#endif
}
RawContext* RawContextFactory::create_context(std::function<void()> code,
void_pfn_smxprocess_t cleanup, smx_actor_t process)
{
- return this->new_context<RawContext>(std::move(code),
- cleanup, process);
+ return this->new_context<RawContext>(std::move(code), cleanup, process);
}
void RawContext::wrapper(void* arg)
{
- RawContext* context = (RawContext*) arg;
- (*context)();
- context->stop();
+ RawContext* context = static_cast<RawContext*>(arg);
+ try {
+ (*context)();
+ context->Context::stop();
+ } catch (StopRequest const&) {
+ XBT_DEBUG("Caught a StopRequest");
+ }
+ context->suspend();
}
RawContext::RawContext(std::function<void()> code,
void RawContext::stop()
{
Context::stop();
- this->suspend();
+ throw StopRequest();
}
void RawContextFactory::run_all()
void RawContextFactory::run_all_serial()
{
- if (xbt_dynar_is_empty(simix_global->process_to_run))
+ if (simix_global->process_to_run.empty())
return;
- smx_actor_t first_process =
- xbt_dynar_get_as(simix_global->process_to_run, 0, smx_actor_t);
+ smx_actor_t first_process = simix_global->process_to_run.front();
raw_process_index = 1;
static_cast<RawContext*>(first_process->context)->resume_serial();
}
#if HAVE_THREAD_CONTEXTS
raw_threads_working = 0;
if (raw_parmap == nullptr)
- raw_parmap = xbt_parmap_new(
- SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode());
- xbt_parmap_apply(raw_parmap,
- [](void* arg) {
- smx_actor_t process = static_cast<smx_actor_t>(arg);
+ raw_parmap = new simgrid::xbt::Parmap<smx_actor_t>(SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode());
+ raw_parmap->apply(
+ [](smx_actor_t process) {
RawContext* context = static_cast<RawContext*>(process->context);
context->resume_parallel();
},
{
/* determine the next context */
RawContext* next_context = nullptr;
- unsigned long int i;
- i = raw_process_index++;
- if (i < xbt_dynar_length(simix_global->process_to_run)) {
+ unsigned long int i = raw_process_index;
+ raw_process_index++;
+ if (i < simix_global->process_to_run.size()) {
/* execute the next process */
XBT_DEBUG("Run next process");
- next_context = (RawContext*) xbt_dynar_get_as(
- simix_global->process_to_run, i, smx_actor_t)->context;
- }
- else {
+ next_context = static_cast<RawContext*>(simix_global->process_to_run[i]->context);
+ } else {
/* all processes were run, return to maestro */
XBT_DEBUG("No more process to run");
- next_context = (RawContext*) raw_maestro_context;
+ next_context = static_cast<RawContext*>(raw_maestro_context);
}
SIMIX_context_set_current(next_context);
raw_swapcontext(&this->stack_top_, next_context->stack_top_);
{
#if HAVE_THREAD_CONTEXTS
/* determine the next context */
- smx_actor_t next_work = (smx_actor_t) xbt_parmap_next(raw_parmap);
- RawContext* next_context = nullptr;
-
- if (next_work != nullptr) {
+ boost::optional<smx_actor_t> next_work = raw_parmap->next();
+ RawContext* next_context;
+ if (next_work) {
/* there is a next process to resume */
XBT_DEBUG("Run next process");
- next_context = (RawContext*) next_work->context;
- }
- else {
+ next_context = static_cast<RawContext*>(next_work.get()->context);
+ } else {
/* all processes were run, go to the barrier */
XBT_DEBUG("No more processes to run");
uintptr_t worker_id = (uintptr_t)
xbt_os_thread_get_specific(raw_worker_id_key);
- next_context = (RawContext*) raw_workers_context[worker_id];
+ next_context = raw_workers_context[worker_id];
XBT_DEBUG("Restoring worker stack %zu (working threads = %zu)",
worker_id, raw_threads_working);
}
#if HAVE_THREAD_CONTEXTS
uintptr_t worker_id = __sync_fetch_and_add(&raw_threads_working, 1);
xbt_os_thread_set_specific(raw_worker_id_key, (void*) worker_id);
- RawContext* worker_context = (RawContext*) SIMIX_context_self();
+ RawContext* worker_context = static_cast<RawContext*>(SIMIX_context_self());
raw_workers_context[worker_id] = worker_context;
XBT_DEBUG("Saving worker stack %zu", worker_id);
SIMIX_context_set_current(this);
#endif
}
-/** @brief Resumes all processes ready to run. */
-void RawContextFactory::run_all_adaptative()
+ContextFactory* raw_factory()
{
- unsigned long nb_processes = xbt_dynar_length(simix_global->process_to_run);
- if (SIMIX_context_is_parallel()
- && (unsigned long) SIMIX_context_get_parallel_threshold() < nb_processes) {
- raw_context_parallel = true;
- XBT_DEBUG("Runall // %lu", nb_processes);
- this->run_all_parallel();
- } else {
- XBT_DEBUG("Runall serial %lu", nb_processes);
- raw_context_parallel = false;
- this->run_all_serial();
- }
+ XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us.");
+ return new RawContextFactory();
}
-
}}}
