1 /* Copyright (c) 2008-2017. 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 <simgrid_config.h>
9 #include "src/mc/mc_base.h"
10 #include "src/mc/mc_replay.h"
11 #include "src/simix/smx_private.h"
14 #include "src/mc/ModelChecker.hpp"
16 using simgrid::mc::remote;
19 XBT_LOG_NEW_DEFAULT_CATEGORY(mc, "All MC categories");
21 int MC_random(int min, int max)
24 xbt_assert(mc_model_checker == nullptr);
26 /* TODO, if the MC is disabled we do not really need to make a simcall for this :) */
27 return simcall_mc_random(min, max);
33 void wait_for_requests()
36 xbt_assert(mc_model_checker == nullptr);
43 while (not xbt_dynar_is_empty(simix_global->process_to_run)) {
44 SIMIX_process_runall();
45 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
46 req = &process->simcall;
47 if (req->call != SIMCALL_NONE && not simgrid::mc::request_is_visible(req))
48 SIMIX_simcall_handle(req, 0);
52 xbt_dynar_reset(simix_global->actors_vector);
53 for (std::pair<aid_t, smx_actor_t> kv : simix_global->process_list) {
54 xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second);
59 /** @brief returns if there this transition can proceed in a finite amount of time
61 * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
63 * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
64 * Wait operations are OK and return true in only two situations:
65 * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
66 * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this
67 * transition for ever.
70 // Called from both MCer and MCed:
71 bool actor_is_enabled(smx_actor_t actor)
73 smx_simcall_t req = &actor->simcall;
74 // TODO, add support for the subtypes?
80 case SIMCALL_COMM_WAIT: {
81 /* FIXME: check also that src and dst processes are not suspended */
82 simgrid::kernel::activity::CommImpl* act =
83 static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(req));
86 // Fetch from MCed memory:
88 if (mc_model_checker != nullptr) {
89 simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
90 mc_model_checker->process().read(temp_comm, remote(act));
91 act = static_cast<simgrid::kernel::activity::CommImpl*>(temp_comm.getBuffer());
95 if (act->src_timeout || act->dst_timeout) {
96 /* If it has a timeout it will be always be enabled (regardless of who declared the timeout),
97 * because even if the communication is not ready, it can timeout and won't block. */
98 if (_sg_mc_timeout == 1)
101 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
102 else if (act->detached && act->src_proc == nullptr && act->type == SIMIX_COMM_READY)
103 return (act->dst_proc != nullptr);
104 return (act->src_proc && act->dst_proc);
107 case SIMCALL_COMM_WAITANY: {
109 simgrid::kernel::activity::CommImpl* act =
110 static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(req));
113 s_xbt_dynar_t comms_buffer;
114 size_t buffer_size = 0;
115 if (mc_model_checker != nullptr) {
117 mc_model_checker->process().read(&comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
118 assert(comms_buffer.elmsize == sizeof(act));
119 buffer_size = comms_buffer.elmsize * comms_buffer.used;
120 comms = &comms_buffer;
122 comms = simcall_comm_waitany__get__comms(req);
124 // Read all the dynar buffer:
125 char buffer[buffer_size];
126 if (mc_model_checker != nullptr)
127 mc_model_checker->process().read_bytes(buffer, sizeof(buffer), remote(comms->data));
129 comms = simcall_comm_waitany__get__comms(req);
132 for (unsigned int index = 0; index < comms->used; ++index) {
134 // Fetch act from MCed memory:
136 simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
137 if (mc_model_checker != nullptr) {
138 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
139 mc_model_checker->process().read(temp_comm, remote(act));
140 act = static_cast<simgrid::kernel::activity::CommImpl*>(temp_comm.getBuffer());
143 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::CommImpl*);
144 if (act->src_proc && act->dst_proc)
150 case SIMCALL_MUTEX_LOCK: {
151 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
153 simgrid::mc::Remote<simgrid::simix::MutexImpl> temp_mutex;
154 if (mc_model_checker != nullptr) {
155 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
156 mutex = temp_mutex.getBuffer();
160 if (mutex->owner == nullptr)
163 else if (mc_model_checker != nullptr) {
164 simgrid::mc::RemoteClient& modelchecked = mc_model_checker->process();
165 // TODO, *(mutex->owner) :/
166 return modelchecked.resolveActor(simgrid::mc::remote(mutex->owner))->pid ==
167 modelchecked.resolveActor(simgrid::mc::remote(req->issuer))->pid;
171 return mutex->owner->pid == req->issuer->pid;
174 case SIMCALL_SEM_ACQUIRE: {
175 static int warned = 0;
177 XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk");
182 case SIMCALL_COND_WAIT: {
183 static int warned = 0;
185 XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk");
191 /* The rest of the requests are always enabled */
196 bool request_is_visible(smx_simcall_t req)
198 return req->call == SIMCALL_COMM_ISEND
199 || req->call == SIMCALL_COMM_IRECV
200 || req->call == SIMCALL_COMM_WAIT
201 || req->call == SIMCALL_COMM_WAITANY
202 || req->call == SIMCALL_COMM_TEST
203 || req->call == SIMCALL_COMM_TESTANY
204 || req->call == SIMCALL_MC_RANDOM
205 || req->call == SIMCALL_MUTEX_LOCK
206 || req->call == SIMCALL_MUTEX_TRYLOCK
213 static int prng_random(int min, int max)
215 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
216 unsigned long input_size = (unsigned long) RAND_MAX + 1;
217 unsigned long reject_size = input_size % output_size;
218 unsigned long accept_size = input_size - reject_size; // module*accept_size
220 // Use rejection in order to avoid skew
224 x = (unsigned long) random();
226 x = (unsigned long) rand();
228 } while( x >= accept_size );
229 return min + (x % output_size);
232 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
234 if (not MC_is_active() && not MC_record_path)
235 return prng_random(min, max);
236 return simcall->mc_value;