1 /* Copyright (c) 2008-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include <simgrid_config.h>
12 #include <xbt/asserts.h>
13 #include <xbt/dynar.h>
15 #include <simgrid/simix.h>
17 #include "src/mc/mc_base.h"
18 #include "src/simix/smx_private.h"
19 #include "src/mc/mc_replay.h"
21 #include "src/mc/mc_protocol.h"
23 #include "src/kernel/activity/ActivityImpl.hpp"
24 #include "src/kernel/activity/SynchroIo.hpp"
25 #include "src/kernel/activity/SynchroComm.hpp"
26 #include "src/kernel/activity/SynchroRaw.hpp"
27 #include "src/kernel/activity/SynchroSleep.hpp"
28 #include "src/kernel/activity/SynchroExec.hpp"
31 #include "src/mc/mc_request.h"
32 #include "src/mc/Process.hpp"
33 #include "src/mc/ModelChecker.hpp"
34 #include "src/mc/mc_smx.h"
38 using simgrid::mc::remote;
41 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
43 int MC_random(int min, int max)
46 xbt_assert(mc_model_checker == nullptr);
47 /* TODO, if the MC is disabled we do not really need to make a simcall for
50 return simcall_mc_random(min, max);
56 void wait_for_requests(void)
59 xbt_assert(mc_model_checker == nullptr);
66 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
67 SIMIX_process_runall();
68 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
69 req = &process->simcall;
70 if (req->call != SIMCALL_NONE && !simgrid::mc::request_is_visible(req))
71 SIMIX_simcall_handle(req, 0);
76 /** @brief returns if there this transition can proceed in a finite amount of time
78 * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
80 * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
81 * Wait operations are OK and return true in only two situations:
82 * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
83 * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this transition for ever.
86 // Called from both MCer and MCed:
87 bool request_is_enabled(smx_simcall_t req)
89 unsigned int index = 0;
90 // TODO, add support for the subtypes?
96 case SIMCALL_SEM_ACQUIRE:
97 xbt_die("Don't use semaphores in model-checked code, it's not supported yet");
98 case SIMCALL_COND_WAIT:
99 xbt_die("Don't use condition variables in model-checked code, it's not supported yet");
101 case SIMCALL_COMM_WAIT:
103 /* FIXME: check also that src and dst processes are not suspended */
104 simgrid::kernel::activity::Comm *act =
105 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
108 // Fetch from MCed memory:
110 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
111 if (mc_model_checker != nullptr) {
112 mc_model_checker->process().read(temp_comm, remote(act));
113 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
117 if (simcall_comm_wait__get__timeout(req) >= 0) {
118 /* If it has a timeout it will be always be enabled, because even if the
119 * communication is not ready, it can timeout and won't block. */
120 if (_sg_mc_timeout == 1)
123 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
124 else if (act->detached && act->src_proc == nullptr
125 && act->type == SIMIX_COMM_READY)
126 return (act->dst_proc != nullptr);
127 return (act->src_proc && act->dst_proc);
130 case SIMCALL_COMM_WAITANY: {
132 simgrid::kernel::activity::Comm *act =
133 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(req));
136 s_xbt_dynar_t comms_buffer;
137 size_t buffer_size = 0;
138 if (mc_model_checker != nullptr) {
140 mc_model_checker->process().read(
141 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
142 assert(comms_buffer.elmsize == sizeof(act));
143 buffer_size = comms_buffer.elmsize * comms_buffer.used;
144 comms = &comms_buffer;
146 comms = simcall_comm_waitany__get__comms(req);
148 // Read all the dynar buffer:
149 char buffer[buffer_size];
150 if (mc_model_checker != nullptr)
151 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
152 remote(comms->data));
154 comms = simcall_comm_waitany__get__comms(req);
157 for (index = 0; index < comms->used; ++index) {
159 // Fetch act from MCed memory:
161 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_comm;
162 if (mc_model_checker != nullptr) {
163 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
164 mc_model_checker->process().read(temp_comm, remote(act));
165 act = static_cast<simgrid::kernel::activity::Comm*>(temp_comm.getBuffer());
169 act = xbt_dynar_get_as(comms, index, simgrid::kernel::activity::Comm*);
170 if (act->src_proc && act->dst_proc)
176 case SIMCALL_MUTEX_LOCK: {
177 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
179 simgrid::mc::Remote<simgrid::simix::Mutex> temp_mutex;
180 if (mc_model_checker != nullptr) {
181 mc_model_checker->process().read(temp_mutex.getBuffer(), remote(mutex));
182 mutex = temp_mutex.getBuffer();
186 if(mutex->owner == nullptr)
189 else if (mc_model_checker != nullptr) {
190 simgrid::mc::Process& modelchecked = mc_model_checker->process();
191 // TODO, *(mutex->owner) :/
192 return modelchecked.resolveProcess(simgrid::mc::remote(mutex->owner))->pid
193 == modelchecked.resolveProcess(simgrid::mc::remote(req->issuer))->pid;
197 return mutex->owner->pid == req->issuer->pid;
201 /* The rest of the requests are always enabled */
206 bool request_is_visible(smx_simcall_t req)
208 return req->call == SIMCALL_COMM_ISEND
209 || req->call == SIMCALL_COMM_IRECV
210 || req->call == SIMCALL_COMM_WAIT
211 || req->call == SIMCALL_COMM_WAITANY
212 || req->call == SIMCALL_COMM_TEST
213 || req->call == SIMCALL_COMM_TESTANY
214 || req->call == SIMCALL_MC_RANDOM
215 || req->call == SIMCALL_MUTEX_LOCK
216 || req->call == SIMCALL_MUTEX_TRYLOCK
223 static int prng_random(int min, int max)
225 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
226 unsigned long input_size = (unsigned long) RAND_MAX + 1;
227 unsigned long reject_size = input_size % output_size;
228 unsigned long accept_size = input_size - reject_size; // module*accept_size
230 // Use rejection in order to avoid skew
234 x = (unsigned long) random();
236 x = (unsigned long) rand();
238 } while( x >= accept_size );
239 return min + (x % output_size);
242 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
244 if (!MC_is_active() && !MC_record_path)
245 return prng_random(min, max);
246 return simcall->mc_value;