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, "This must be called from the client");
42 while (not xbt_dynar_is_empty(simix_global->process_to_run)) {
43 SIMIX_process_runall();
44 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
45 smx_simcall_t req = &process->simcall;
46 if (req->call != SIMCALL_NONE && not simgrid::mc::request_is_visible(req))
47 SIMIX_simcall_handle(req, 0);
51 xbt_dynar_reset(simix_global->actors_vector);
52 for (std::pair<aid_t, smx_actor_t> kv : simix_global->process_list) {
53 xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second);
58 /** @brief returns if there this transition can proceed in a finite amount of time
60 * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
62 * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
63 * Wait operations are OK and return true in only two situations:
64 * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
65 * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this
66 * transition for ever.
69 // Called from both MCer and MCed:
70 bool actor_is_enabled(smx_actor_t actor)
72 smx_simcall_t req = &actor->simcall;
73 // TODO, add support for the subtypes?
79 case SIMCALL_COMM_WAIT: {
80 /* FIXME: check also that src and dst processes are not suspended */
81 simgrid::kernel::activity::CommImpl* act =
82 static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(req));
85 // Fetch from MCed memory:
87 if (mc_model_checker != nullptr) {
88 simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
89 mc_model_checker->process().read(temp_comm, remote(act));
90 act = static_cast<simgrid::kernel::activity::CommImpl*>(temp_comm.getBuffer());
94 if (act->src_timeout || act->dst_timeout) {
95 /* If it has a timeout it will be always be enabled (regardless of who declared the timeout),
96 * because even if the communication is not ready, it can timeout and won't block. */
97 if (_sg_mc_timeout == 1)
100 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
101 else if (act->detached && act->src_proc == nullptr && 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::CommImpl* act =
109 static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__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(&comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
117 assert(comms_buffer.elmsize == sizeof(act));
118 buffer_size = comms_buffer.elmsize * comms_buffer.used;
119 comms = &comms_buffer;
121 comms = simcall_comm_waitany__get__comms(req);
123 // Read all the dynar buffer:
124 char buffer[buffer_size];
125 if (mc_model_checker != nullptr)
126 mc_model_checker->process().read_bytes(buffer, sizeof(buffer), remote(comms->data));
128 comms = simcall_comm_waitany__get__comms(req);
131 for (unsigned int index = 0; index < comms->used; ++index) {
133 // Fetch act from MCed memory:
135 simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
136 if (mc_model_checker != nullptr) {
137 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
138 mc_model_checker->process().read(temp_comm, remote(act));
139 act = static_cast<simgrid::kernel::activity::CommImpl*>(temp_comm.getBuffer());
142 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::CommImpl*);
143 if (act->src_proc && act->dst_proc)
149 case SIMCALL_MUTEX_LOCK: {
150 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
152 simgrid::mc::Remote<simgrid::simix::MutexImpl> temp_mutex;
153 if (mc_model_checker != nullptr) {
154 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
155 mutex = temp_mutex.getBuffer();
159 if (mutex->owner == nullptr)
162 else if (mc_model_checker != nullptr) {
163 simgrid::mc::RemoteClient& modelchecked = mc_model_checker->process();
164 // TODO, *(mutex->owner) :/
165 return modelchecked.resolveActor(simgrid::mc::remote(mutex->owner))->pid ==
166 modelchecked.resolveActor(simgrid::mc::remote(req->issuer))->pid;
170 return mutex->owner->pid == req->issuer->pid;
173 case SIMCALL_SEM_ACQUIRE: {
174 static int warned = 0;
176 XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk");
181 case SIMCALL_COND_WAIT: {
182 static int warned = 0;
184 XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk");
190 /* The rest of the requests are always enabled */
195 /* This is the list of requests that are visible from the checker algorithm.
196 * Any other requests are handled right away on the application side.
198 bool request_is_visible(smx_simcall_t req)
200 xbt_assert(mc_model_checker == nullptr, "This should be called from the client side");
201 return req->call == SIMCALL_COMM_ISEND
202 || req->call == SIMCALL_COMM_IRECV
203 || req->call == SIMCALL_COMM_WAIT
204 || req->call == SIMCALL_COMM_WAITANY
205 || req->call == SIMCALL_COMM_TEST
206 || req->call == SIMCALL_COMM_TESTANY
207 || req->call == SIMCALL_MC_RANDOM
208 || req->call == SIMCALL_MUTEX_LOCK
209 || req->call == SIMCALL_MUTEX_TRYLOCK
216 static int prng_random(int min, int max)
218 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
219 unsigned long input_size = (unsigned long) RAND_MAX + 1;
220 unsigned long reject_size = input_size % output_size;
221 unsigned long accept_size = input_size - reject_size; // module*accept_size
223 // Use rejection in order to avoid skew
227 x = (unsigned long) random();
229 x = (unsigned long) rand();
231 } while( x >= accept_size );
232 return min + (x % output_size);
235 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
237 if (not MC_is_active() && not MC_record_path)
238 return prng_random(min, max);
239 return simcall->mc_value;