-/* Copyright (c) 2008-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2008-2017. 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 <cassert>
-
#include <simgrid_config.h>
-#include <xbt/log.h>
-#include <xbt/asserts.h>
-#include <xbt/dynar.h>
-
-#include <simgrid/simix.h>
-
+#include "mc/mc.h"
#include "src/mc/mc_base.h"
-#include "src/simix/smx_private.h"
#include "src/mc/mc_replay.h"
-#include "mc/mc.h"
-#include "src/mc/mc_protocol.h"
+#include "src/simix/smx_private.hpp"
-#if HAVE_MC
-#include "src/mc/mc_request.h"
-#include "src/mc/Process.hpp"
+#if SIMGRID_HAVE_MC
#include "src/mc/ModelChecker.hpp"
-#include "src/mc/mc_smx.h"
-#endif
-#if HAVE_MC
using simgrid::mc::remote;
#endif
-XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
+XBT_LOG_NEW_DEFAULT_CATEGORY(mc, "All MC categories");
int MC_random(int min, int max)
{
- xbt_assert(mc_mode != MC_MODE_SERVER);
- /* TODO, if the MC is disabled we do not really need to make a simcall for
- * this :) */
+#if SIMGRID_HAVE_MC
+ xbt_assert(mc_model_checker == nullptr);
+#endif
+ /* TODO, if the MC is disabled we do not really need to make a simcall for this :) */
return simcall_mc_random(min, max);
}
namespace simgrid {
namespace mc {
-void wait_for_requests(void)
+void wait_for_requests()
{
- assert(mc_mode != MC_MODE_SERVER);
-
- smx_process_t process;
- smx_simcall_t req;
- unsigned int iter;
-
- while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
+#if SIMGRID_HAVE_MC
+ xbt_assert(mc_model_checker == nullptr, "This must be called from the client");
+#endif
+ while (not simix_global->process_to_run.empty()) {
SIMIX_process_runall();
- xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
- req = &process->simcall;
- if (req->call != SIMCALL_NONE && !simgrid::mc::request_is_visible(req))
+ for (smx_actor_t const& process : simix_global->process_that_ran) {
+ smx_simcall_t req = &process->simcall;
+ if (req->call != SIMCALL_NONE && not simgrid::mc::request_is_visible(req))
SIMIX_simcall_handle(req, 0);
}
}
+#if SIMGRID_HAVE_MC
+ xbt_dynar_reset(simix_global->actors_vector);
+ for (std::pair<aid_t, smx_actor_t> const& kv : simix_global->process_list) {
+ xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second);
+ }
+#endif
}
+/** @brief returns if there this transition can proceed in a finite amount of time
+ *
+ * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
+ *
+ * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
+ * Wait operations are OK and return true in only two situations:
+ * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
+ * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this
+ * transition for ever.
+ *
+ */
// Called from both MCer and MCed:
-bool request_is_enabled(smx_simcall_t req)
+bool actor_is_enabled(smx_actor_t actor)
{
- unsigned int index = 0;
- smx_synchro_t act = 0;
-#if HAVE_MC
- s_smx_synchro_t temp_synchro;
+#if SIMGRID_HAVE_MC
+ // If in the MCer, ask the client app since it has all the data
+ if (mc_model_checker != nullptr) {
+ return mc_model_checker->process().actor_is_enabled(actor->pid);
+ }
#endif
+ // Now, we are in the client app, no need for remote memory reading.
+ smx_simcall_t req = &actor->simcall;
+
switch (req->call) {
- case SIMCALL_NONE:
- return false;
-
- case SIMCALL_COMM_WAIT:
- /* FIXME: check also that src and dst processes are not suspended */
- act = simcall_comm_wait__get__comm(req);
-
-#if HAVE_MC
- // Fetch from MCed memory:
- if (mc_mode == MC_MODE_SERVER) {
- mc_model_checker->process().read(&temp_synchro, remote(act));
- act = &temp_synchro;
+ case SIMCALL_NONE:
+ return false;
+
+ case SIMCALL_COMM_WAIT: {
+ /* FIXME: check also that src and dst processes are not suspended */
+ simgrid::kernel::activity::CommImpl* act =
+ static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(req));
+
+ if (act->src_timeout || act->dst_timeout) {
+ /* If it has a timeout it will be always be enabled (regardless of who declared the timeout),
+ * because even if the communication is not ready, it can timeout and won't block. */
+ if (_sg_mc_timeout == 1)
+ return true;
+ }
+ /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
+ else if (act->detached && act->src_proc == nullptr && act->type == SIMIX_COMM_READY)
+ return (act->dst_proc != nullptr);
+ return (act->src_proc && act->dst_proc);
}
-#endif
- if (simcall_comm_wait__get__timeout(req) >= 0) {
- /* If it has a timeout it will be always be enabled, because even if the
- * communication is not ready, it can timeout and won't block. */
- if (_sg_mc_timeout == 1)
- return true;
+ case SIMCALL_COMM_WAITANY: {
+ xbt_dynar_t comms = simcall_comm_waitany__get__comms(req);
+ for (unsigned int index = 0; index < comms->used; ++index) {
+ simgrid::kernel::activity::CommImpl* act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::CommImpl*);
+ if (act->src_proc && act->dst_proc)
+ return true;
+ }
+ return false;
}
- /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
- else if (act->comm.detached && act->comm.src_proc == nullptr
- && act->comm.type == SIMIX_COMM_READY)
- return (act->comm.dst_proc != nullptr);
- return (act->comm.src_proc && act->comm.dst_proc);
-
- case SIMCALL_COMM_WAITANY: {
- xbt_dynar_t comms;
-#if HAVE_MC
-
- s_xbt_dynar_t comms_buffer;
- size_t buffer_size = 0;
- if (mc_mode == MC_MODE_SERVER) {
- // Read dynar:
- mc_model_checker->process().read(
- &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
- assert(comms_buffer.elmsize == sizeof(act));
- buffer_size = comms_buffer.elmsize * comms_buffer.used;
- comms = &comms_buffer;
- } else
- comms = simcall_comm_waitany__get__comms(req);
-
- // Read all the dynar buffer:
- char buffer[buffer_size];
- if (mc_mode == MC_MODE_SERVER)
- mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
- remote(comms->data));
-#else
- comms = simcall_comm_waitany__get__comms(req);
-#endif
- for (index = 0; index < comms->used; ++index) {
-#if HAVE_MC
- // Fetch act from MCed memory:
- if (mc_mode == MC_MODE_SERVER) {
- memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
- mc_model_checker->process().read(&temp_synchro, remote(act));
- act = &temp_synchro;
- }
- else
-#endif
- act = xbt_dynar_get_as(comms, index, smx_synchro_t);
- if (act->comm.src_proc && act->comm.dst_proc)
+ case SIMCALL_MUTEX_LOCK: {
+ smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
+
+ if (mutex->owner == nullptr)
return true;
+ return mutex->owner->pid == req->issuer->pid;
}
- return false;
- }
- case SIMCALL_MUTEX_TRYLOCK:
- return true;
-
- case SIMCALL_MUTEX_LOCK: {
- smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
-#if HAVE_MC
- s_smx_mutex_t temp_mutex;
- if (mc_mode == MC_MODE_SERVER) {
- mc_model_checker->process().read(&temp_mutex, remote(mutex));
- mutex = &temp_mutex;
+ case SIMCALL_SEM_ACQUIRE: {
+ static int warned = 0;
+ if (not warned)
+ XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk");
+ warned = 1;
+ return true;
}
-#endif
- if(mutex->owner == nullptr)
+
+ case SIMCALL_COND_WAIT: {
+ static int warned = 0;
+ if (not warned)
+ XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk");
+ warned = 1;
return true;
- else
-#if HAVE_MC
- // TODO, *(mutex->owner) :/
- return MC_smx_resolve_process(mutex->owner)->pid ==
- MC_smx_resolve_process(req->issuer)->pid;
-#else
- return mutex->owner->pid == req->issuer->pid;
-#endif
}
- default:
- /* The rest of the requests are always enabled */
- return true;
+ default:
+ /* The rest of the requests are always enabled */
+ return true;
}
}
+/* This is the list of requests that are visible from the checker algorithm.
+ * Any other requests are handled right away on the application side.
+ */
bool request_is_visible(smx_simcall_t req)
{
- return req->call == SIMCALL_COMM_ISEND
- || req->call == SIMCALL_COMM_IRECV
- || req->call == SIMCALL_COMM_WAIT
- || req->call == SIMCALL_COMM_WAITANY
- || req->call == SIMCALL_COMM_TEST
- || req->call == SIMCALL_COMM_TESTANY
- || req->call == SIMCALL_MC_RANDOM
- || req->call == SIMCALL_MUTEX_LOCK
- || req->call == SIMCALL_MUTEX_TRYLOCK
- ;
+#if SIMGRID_HAVE_MC
+ xbt_assert(mc_model_checker == nullptr, "This should be called from the client side");
+#endif
+
+ return req->call == SIMCALL_COMM_ISEND || req->call == SIMCALL_COMM_IRECV || req->call == SIMCALL_COMM_WAIT ||
+ req->call == SIMCALL_COMM_WAITANY || req->call == SIMCALL_COMM_TEST || req->call == SIMCALL_COMM_TESTANY ||
+ req->call == SIMCALL_MC_RANDOM || req->call == SIMCALL_MUTEX_LOCK || req->call == SIMCALL_MUTEX_TRYLOCK ||
+ req->call == SIMCALL_MUTEX_UNLOCK;
}
}
int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
{
- if (!MC_is_active() && !MC_record_path)
+ if (not MC_is_active() && MC_record_path.empty())
return prng_random(min, max);
return simcall->mc_value;
}
