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(void)
36 xbt_assert(mc_model_checker == nullptr);
43 while (!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 && !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 transition for ever.
69 // Called from both MCer and MCed:
70 bool request_is_enabled(smx_simcall_t req)
72 unsigned int index = 0;
73 // TODO, add support for the subtypes?
79 case SIMCALL_COMM_WAIT:
81 /* FIXME: check also that src and dst processes are not suspended */
82 simgrid::kernel::activity::Comm *act =
83 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
86 // Fetch from MCed memory:
88 if (mc_model_checker != nullptr) {
89 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
90 mc_model_checker->process().read(temp_comm, remote(act));
91 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
95 if (simcall_comm_wait__get__timeout(req) >= 0) {
96 /* If it has a timeout it will be always be enabled, because even if the
97 * 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
103 && act->type == SIMIX_COMM_READY)
104 return (act->dst_proc != nullptr);
105 return (act->src_proc && act->dst_proc);
108 case SIMCALL_COMM_WAITANY: {
110 simgrid::kernel::activity::Comm *act =
111 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
114 s_xbt_dynar_t comms_buffer;
115 size_t buffer_size = 0;
116 if (mc_model_checker != nullptr) {
118 mc_model_checker->process().read(
119 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
120 assert(comms_buffer.elmsize == sizeof(act));
121 buffer_size = comms_buffer.elmsize * comms_buffer.used;
122 comms = &comms_buffer;
124 comms = simcall_comm_waitany__get__comms(req);
126 // Read all the dynar buffer:
127 char buffer[buffer_size];
128 if (mc_model_checker != nullptr)
129 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
130 remote(comms->data));
132 comms = simcall_comm_waitany__get__comms(req);
135 for (index = 0; index < comms->used; ++index) {
137 // Fetch act from MCed memory:
139 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
140 if (mc_model_checker != nullptr) {
141 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
142 mc_model_checker->process().read(temp_comm, remote(act));
143 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
147 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::Comm*);
148 if (act->src_proc && act->dst_proc)
154 case SIMCALL_MUTEX_LOCK: {
155 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
157 simgrid::mc::Remote<simgrid::simix::Mutex> temp_mutex;
158 if (mc_model_checker != nullptr) {
159 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
160 mutex = temp_mutex.getBuffer();
164 if(mutex->owner == nullptr)
167 else if (mc_model_checker != nullptr) {
168 simgrid::mc::Process& modelchecked = mc_model_checker->process();
169 // TODO, *(mutex->owner) :/
170 return modelchecked.resolveActor(simgrid::mc::remote(mutex->owner))->pid ==
171 modelchecked.resolveActor(simgrid::mc::remote(req->issuer))->pid;
175 return mutex->owner->pid == req->issuer->pid;
178 case SIMCALL_SEM_ACQUIRE: {
179 static int warned = 0;
181 XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk");
186 case SIMCALL_COND_WAIT: {
187 static int warned = 0;
189 XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk");
195 /* The rest of the requests are always enabled */
200 bool request_is_visible(smx_simcall_t req)
202 return req->call == SIMCALL_COMM_ISEND
203 || req->call == SIMCALL_COMM_IRECV
204 || req->call == SIMCALL_COMM_WAIT
205 || req->call == SIMCALL_COMM_WAITANY
206 || req->call == SIMCALL_COMM_TEST
207 || req->call == SIMCALL_COMM_TESTANY
208 || req->call == SIMCALL_MC_RANDOM
209 || req->call == SIMCALL_MUTEX_LOCK
210 || req->call == SIMCALL_MUTEX_TRYLOCK
217 static int prng_random(int min, int max)
219 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
220 unsigned long input_size = (unsigned long) RAND_MAX + 1;
221 unsigned long reject_size = input_size % output_size;
222 unsigned long accept_size = input_size - reject_size; // module*accept_size
224 // Use rejection in order to avoid skew
228 x = (unsigned long) random();
230 x = (unsigned long) rand();
232 } while( x >= accept_size );
233 return min + (x % output_size);
236 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
238 if (!MC_is_active() && !MC_record_path)
239 return prng_random(min, max);
240 return simcall->mc_value;