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_replay.h"
12 #include "src/mc/ModelChecker.hpp"
14 using simgrid::mc::remote;
17 XBT_LOG_NEW_DEFAULT_CATEGORY(mc, "All MC categories");
19 int MC_random(int min, int max)
22 xbt_assert(mc_model_checker == nullptr);
24 /* TODO, if the MC is disabled we do not really need to make a simcall for this :) */
25 return simcall_mc_random(min, max);
31 void wait_for_requests(void)
34 xbt_assert(mc_model_checker == nullptr);
41 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
42 SIMIX_process_runall();
43 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
44 req = &process->simcall;
45 if (req->call != SIMCALL_NONE && !simgrid::mc::request_is_visible(req))
46 SIMIX_simcall_handle(req, 0);
50 xbt_dynar_reset(simix_global->actors_vector);
51 for (std::pair<aid_t, smx_actor_t> kv : simix_global->process_list) {
52 xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second);
57 /** @brief returns if there this transition can proceed in a finite amount of time
59 * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
61 * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
62 * Wait operations are OK and return true in only two situations:
63 * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
64 * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this transition for ever.
67 // Called from both MCer and MCed:
68 bool request_is_enabled(smx_simcall_t req)
70 unsigned int index = 0;
71 // TODO, add support for the subtypes?
77 case SIMCALL_COMM_WAIT:
79 /* FIXME: check also that src and dst processes are not suspended */
80 simgrid::kernel::activity::Comm *act =
81 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
84 // Fetch from MCed memory:
86 if (mc_model_checker != nullptr) {
87 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
88 mc_model_checker->process().read(temp_comm, remote(act));
89 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
93 if (simcall_comm_wait__get__timeout(req) >= 0) {
94 /* If it has a timeout it will be always be enabled, because even if the
95 * communication is not ready, it can timeout and won't block. */
96 if (_sg_mc_timeout == 1)
99 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
100 else if (act->detached && act->src_proc == nullptr
101 && act->type == SIMIX_COMM_READY)
102 return (act->dst_proc != nullptr);
103 return (act->src_proc && act->dst_proc);
106 case SIMCALL_COMM_WAITANY: {
108 simgrid::kernel::activity::Comm *act =
109 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
112 s_xbt_dynar_t comms_buffer;
113 size_t buffer_size = 0;
114 if (mc_model_checker != nullptr) {
116 mc_model_checker->process().read(
117 &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),
128 remote(comms->data));
130 comms = simcall_comm_waitany__get__comms(req);
133 for (index = 0; index < comms->used; ++index) {
135 // Fetch act from MCed memory:
137 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
138 if (mc_model_checker != nullptr) {
139 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
140 mc_model_checker->process().read(temp_comm, remote(act));
141 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
145 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::Comm*);
146 if (act->src_proc && act->dst_proc)
152 case SIMCALL_MUTEX_LOCK: {
153 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
155 simgrid::mc::Remote<simgrid::simix::Mutex> temp_mutex;
156 if (mc_model_checker != nullptr) {
157 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
158 mutex = temp_mutex.getBuffer();
162 if(mutex->owner == nullptr)
165 else if (mc_model_checker != nullptr) {
166 simgrid::mc::Process& modelchecked = mc_model_checker->process();
167 // TODO, *(mutex->owner) :/
168 return modelchecked.resolveActor(simgrid::mc::remote(mutex->owner))->pid ==
169 modelchecked.resolveActor(simgrid::mc::remote(req->issuer))->pid;
173 return mutex->owner->pid == req->issuer->pid;
176 case SIMCALL_SEM_ACQUIRE: {
177 static int warned = 0;
179 XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk");
184 case SIMCALL_COND_WAIT: {
185 static int warned = 0;
187 XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk");
193 /* The rest of the requests are always enabled */
198 bool request_is_visible(smx_simcall_t req)
200 return req->call == SIMCALL_COMM_ISEND
201 || req->call == SIMCALL_COMM_IRECV
202 || req->call == SIMCALL_COMM_WAIT
203 || req->call == SIMCALL_COMM_WAITANY
204 || req->call == SIMCALL_COMM_TEST
205 || req->call == SIMCALL_COMM_TESTANY
206 || req->call == SIMCALL_MC_RANDOM
207 || req->call == SIMCALL_MUTEX_LOCK
208 || req->call == SIMCALL_MUTEX_TRYLOCK
215 static int prng_random(int min, int max)
217 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
218 unsigned long input_size = (unsigned long) RAND_MAX + 1;
219 unsigned long reject_size = input_size % output_size;
220 unsigned long accept_size = input_size - reject_size; // module*accept_size
222 // Use rejection in order to avoid skew
226 x = (unsigned long) random();
228 x = (unsigned long) rand();
230 } while( x >= accept_size );
231 return min + (x % output_size);
234 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
236 if (!MC_is_active() && !MC_record_path)
237 return prng_random(min, max);
238 return simcall->mc_value;