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. */
8 #include <simgrid_config.h>
11 #include <xbt/asserts.h>
12 #include <xbt/dynar.h>
14 #include <simgrid/simix.h>
17 #include "src/mc/mc_base.h"
18 #include "src/mc/mc_replay.h"
19 #include "src/mc/remote/mc_protocol.h"
20 #include "src/simix/smx_private.h"
22 #include "src/kernel/activity/ActivityImpl.hpp"
23 #include "src/kernel/activity/SynchroIo.hpp"
24 #include "src/kernel/activity/SynchroComm.hpp"
25 #include "src/kernel/activity/SynchroRaw.hpp"
26 #include "src/kernel/activity/SynchroSleep.hpp"
27 #include "src/kernel/activity/SynchroExec.hpp"
30 #include "src/mc/mc_request.h"
31 #include "src/mc/Process.hpp"
32 #include "src/mc/ModelChecker.hpp"
33 #include "src/mc/mc_smx.h"
35 using simgrid::mc::remote;
38 XBT_LOG_NEW_DEFAULT_CATEGORY(mc, "All MC categories");
40 int MC_random(int min, int max)
43 xbt_assert(mc_model_checker == nullptr);
44 /* TODO, if the MC is disabled we do not really need to make a simcall for
47 return simcall_mc_random(min, max);
53 void wait_for_requests(void)
56 xbt_assert(mc_model_checker == nullptr);
63 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
64 SIMIX_process_runall();
65 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
66 req = &process->simcall;
67 if (req->call != SIMCALL_NONE && !simgrid::mc::request_is_visible(req))
68 SIMIX_simcall_handle(req, 0);
72 xbt_dynar_reset(simix_global->actors_vector);
73 for (std::pair<aid_t, smx_actor_t> kv : simix_global->process_list) {
74 xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second);
79 /** @brief returns if there this transition can proceed in a finite amount of time
81 * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
83 * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
84 * Wait operations are OK and return true in only two situations:
85 * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
86 * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this transition for ever.
89 // Called from both MCer and MCed:
90 bool request_is_enabled(smx_simcall_t req)
92 unsigned int index = 0;
93 // TODO, add support for the subtypes?
99 case SIMCALL_COMM_WAIT:
101 /* FIXME: check also that src and dst processes are not suspended */
102 simgrid::kernel::activity::Comm *act =
103 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
106 // Fetch from MCed memory:
108 if (mc_model_checker != nullptr) {
109 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
110 mc_model_checker->process().read(temp_comm, remote(act));
111 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
115 if (simcall_comm_wait__get__timeout(req) >= 0) {
116 /* If it has a timeout it will be always be enabled, because even if the
117 * communication is not ready, it can timeout and won't block. */
118 if (_sg_mc_timeout == 1)
121 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
122 else if (act->detached && act->src_proc == nullptr
123 && act->type == SIMIX_COMM_READY)
124 return (act->dst_proc != nullptr);
125 return (act->src_proc && act->dst_proc);
128 case SIMCALL_COMM_WAITANY: {
130 simgrid::kernel::activity::Comm *act =
131 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
134 s_xbt_dynar_t comms_buffer;
135 size_t buffer_size = 0;
136 if (mc_model_checker != nullptr) {
138 mc_model_checker->process().read(
139 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
140 assert(comms_buffer.elmsize == sizeof(act));
141 buffer_size = comms_buffer.elmsize * comms_buffer.used;
142 comms = &comms_buffer;
144 comms = simcall_comm_waitany__get__comms(req);
146 // Read all the dynar buffer:
147 char buffer[buffer_size];
148 if (mc_model_checker != nullptr)
149 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
150 remote(comms->data));
152 comms = simcall_comm_waitany__get__comms(req);
155 for (index = 0; index < comms->used; ++index) {
157 // Fetch act from MCed memory:
159 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
160 if (mc_model_checker != nullptr) {
161 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
162 mc_model_checker->process().read(temp_comm, remote(act));
163 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
167 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::Comm*);
168 if (act->src_proc && act->dst_proc)
174 case SIMCALL_MUTEX_LOCK: {
175 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
177 simgrid::mc::Remote<simgrid::simix::Mutex> temp_mutex;
178 if (mc_model_checker != nullptr) {
179 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
180 mutex = temp_mutex.getBuffer();
184 if(mutex->owner == nullptr)
187 else if (mc_model_checker != nullptr) {
188 simgrid::mc::Process& modelchecked = mc_model_checker->process();
189 // TODO, *(mutex->owner) :/
190 return modelchecked.resolveActor(simgrid::mc::remote(mutex->owner))->pid ==
191 modelchecked.resolveActor(simgrid::mc::remote(req->issuer))->pid;
195 return mutex->owner->pid == req->issuer->pid;
198 case SIMCALL_SEM_ACQUIRE: {
199 static int warned = 0;
201 XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk");
206 case SIMCALL_COND_WAIT: {
207 static int warned = 0;
209 XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk");
215 /* The rest of the requests are always enabled */
220 bool request_is_visible(smx_simcall_t req)
222 return req->call == SIMCALL_COMM_ISEND
223 || req->call == SIMCALL_COMM_IRECV
224 || req->call == SIMCALL_COMM_WAIT
225 || req->call == SIMCALL_COMM_WAITANY
226 || req->call == SIMCALL_COMM_TEST
227 || req->call == SIMCALL_COMM_TESTANY
228 || req->call == SIMCALL_MC_RANDOM
229 || req->call == SIMCALL_MUTEX_LOCK
230 || req->call == SIMCALL_MUTEX_TRYLOCK
237 static int prng_random(int min, int max)
239 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
240 unsigned long input_size = (unsigned long) RAND_MAX + 1;
241 unsigned long reject_size = input_size % output_size;
242 unsigned long accept_size = input_size - reject_size; // module*accept_size
244 // Use rejection in order to avoid skew
248 x = (unsigned long) random();
250 x = (unsigned long) rand();
252 } while( x >= accept_size );
253 return min + (x % output_size);
256 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
258 if (!MC_is_active() && !MC_record_path)
259 return prng_random(min, max);
260 return simcall->mc_value;