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_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<int, 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_SEM_ACQUIRE:
100 xbt_die("Don't use semaphores in model-checked code, it's not supported yet");
101 case SIMCALL_COND_WAIT:
102 xbt_die("Don't use condition variables in model-checked code, it's not supported yet");
104 case SIMCALL_COMM_WAIT:
106 /* FIXME: check also that src and dst processes are not suspended */
107 simgrid::kernel::activity::Comm *act =
108 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
111 // Fetch from MCed memory:
113 if (mc_model_checker != nullptr) {
114 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
115 mc_model_checker->process().read(temp_comm, remote(act));
116 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
120 if (simcall_comm_wait__get__timeout(req) >= 0) {
121 /* If it has a timeout it will be always be enabled, because even if the
122 * communication is not ready, it can timeout and won't block. */
123 if (_sg_mc_timeout == 1)
126 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
127 else if (act->detached && act->src_proc == nullptr
128 && act->type == SIMIX_COMM_READY)
129 return (act->dst_proc != nullptr);
130 return (act->src_proc && act->dst_proc);
133 case SIMCALL_COMM_WAITANY: {
135 simgrid::kernel::activity::Comm *act =
136 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
139 s_xbt_dynar_t comms_buffer;
140 size_t buffer_size = 0;
141 if (mc_model_checker != nullptr) {
143 mc_model_checker->process().read(
144 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
145 assert(comms_buffer.elmsize == sizeof(act));
146 buffer_size = comms_buffer.elmsize * comms_buffer.used;
147 comms = &comms_buffer;
149 comms = simcall_comm_waitany__get__comms(req);
151 // Read all the dynar buffer:
152 char buffer[buffer_size];
153 if (mc_model_checker != nullptr)
154 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
155 remote(comms->data));
157 comms = simcall_comm_waitany__get__comms(req);
160 for (index = 0; index < comms->used; ++index) {
162 // Fetch act from MCed memory:
164 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
165 if (mc_model_checker != nullptr) {
166 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
167 mc_model_checker->process().read(temp_comm, remote(act));
168 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
172 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::Comm*);
173 if (act->src_proc && act->dst_proc)
179 case SIMCALL_MUTEX_LOCK: {
180 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
182 simgrid::mc::Remote<simgrid::simix::Mutex> temp_mutex;
183 if (mc_model_checker != nullptr) {
184 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
185 mutex = temp_mutex.getBuffer();
189 if(mutex->owner == nullptr)
192 else if (mc_model_checker != nullptr) {
193 simgrid::mc::Process& modelchecked = mc_model_checker->process();
194 // TODO, *(mutex->owner) :/
195 return modelchecked.resolveActor(simgrid::mc::remote(mutex->owner))->pid ==
196 modelchecked.resolveActor(simgrid::mc::remote(req->issuer))->pid;
200 return mutex->owner->pid == req->issuer->pid;
204 /* The rest of the requests are always enabled */
209 bool request_is_visible(smx_simcall_t req)
211 return req->call == SIMCALL_COMM_ISEND
212 || req->call == SIMCALL_COMM_IRECV
213 || req->call == SIMCALL_COMM_WAIT
214 || req->call == SIMCALL_COMM_WAITANY
215 || req->call == SIMCALL_COMM_TEST
216 || req->call == SIMCALL_COMM_TESTANY
217 || req->call == SIMCALL_MC_RANDOM
218 || req->call == SIMCALL_MUTEX_LOCK
219 || req->call == SIMCALL_MUTEX_TRYLOCK
226 static int prng_random(int min, int max)
228 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
229 unsigned long input_size = (unsigned long) RAND_MAX + 1;
230 unsigned long reject_size = input_size % output_size;
231 unsigned long accept_size = input_size - reject_size; // module*accept_size
233 // Use rejection in order to avoid skew
237 x = (unsigned long) random();
239 x = (unsigned long) rand();
241 } while( x >= accept_size );
242 return min + (x % output_size);
245 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
247 if (!MC_is_active() && !MC_record_path)
248 return prng_random(min, max);
249 return simcall->mc_value;