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"
24 #include "src/mc/mc_request.h"
25 #include "src/mc/Process.hpp"
26 #include "src/mc/ModelChecker.hpp"
27 #include "src/mc/mc_smx.h"
31 using simgrid::mc::remote;
36 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
40 int MC_random(int min, int max)
42 xbt_assert(mc_mode != MC_MODE_SERVER);
43 /* TODO, if the MC is disabled we do not really need to make a simcall for
45 /* FIXME: return mc_current_state->executed_transition->random.value; */
46 return simcall_mc_random(min, max);
52 void wait_for_requests(void)
54 assert(mc_mode != MC_MODE_SERVER);
56 smx_process_t process;
60 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
61 SIMIX_process_runall();
62 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
63 req = &process->simcall;
64 if (req->call != SIMCALL_NONE && !simgrid::mc::request_is_visible(req))
65 SIMIX_simcall_handle(req, 0);
70 // Called from both MCer and MCed:
71 bool request_is_enabled(smx_simcall_t req)
73 unsigned int index = 0;
74 smx_synchro_t act = 0;
76 s_smx_synchro_t temp_synchro;
83 case SIMCALL_COMM_WAIT:
84 /* FIXME: check also that src and dst processes are not suspended */
85 act = simcall_comm_wait__get__comm(req);
88 // Fetch from MCed memory:
89 if (mc_mode == MC_MODE_SERVER) {
90 mc_model_checker->process().read(&temp_synchro, remote(act));
95 if (simcall_comm_wait__get__timeout(req) >= 0) {
96 /* If it has a timeout it will be always be enabled, because even if the
97 * communication is not ready, it can timeout and won't block. */
98 if (_sg_mc_timeout == 1)
101 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
102 else if (act->comm.detached && act->comm.src_proc == nullptr
103 && act->comm.type == SIMIX_COMM_READY)
104 return (act->comm.dst_proc != nullptr);
105 return (act->comm.src_proc && act->comm.dst_proc);
107 case SIMCALL_COMM_WAITANY: {
111 s_xbt_dynar_t comms_buffer;
112 size_t buffer_size = 0;
113 if (mc_mode == MC_MODE_SERVER) {
115 mc_model_checker->process().read(
116 &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_mode == MC_MODE_SERVER)
126 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
127 remote(comms->data));
129 comms = simcall_comm_waitany__get__comms(req);
132 for (index = 0; index < comms->used; ++index) {
134 // Fetch act from MCed memory:
135 if (mc_mode == MC_MODE_SERVER) {
136 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
137 mc_model_checker->process().read(&temp_synchro, remote(act));
142 act = xbt_dynar_get_as(comms, index, smx_synchro_t);
143 if (act->comm.src_proc && act->comm.dst_proc)
149 case SIMCALL_MUTEX_TRYLOCK:
152 case SIMCALL_MUTEX_LOCK: {
153 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
155 s_smx_mutex_t temp_mutex;
156 if (mc_mode == MC_MODE_SERVER) {
157 mc_model_checker->process().read(&temp_mutex, remote(mutex));
161 if(mutex->owner == nullptr)
165 // TODO, *(mutex->owner) :/
166 return MC_smx_resolve_process(mutex->owner)->pid ==
167 MC_smx_resolve_process(req->issuer)->pid;
169 return mutex->owner->pid == req->issuer->pid;
174 /* The rest of the requests are always enabled */
179 bool request_is_visible(smx_simcall_t req)
181 return req->call == SIMCALL_COMM_ISEND
182 || req->call == SIMCALL_COMM_IRECV
183 || req->call == SIMCALL_COMM_WAIT
184 || req->call == SIMCALL_COMM_WAITANY
185 || req->call == SIMCALL_COMM_TEST
186 || req->call == SIMCALL_COMM_TESTANY
187 || req->call == SIMCALL_MC_RANDOM
188 || req->call == SIMCALL_MUTEX_LOCK
189 || req->call == SIMCALL_MUTEX_TRYLOCK
191 || req->call == SIMCALL_MC_SNAPSHOT
192 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
200 static int prng_random(int min, int max)
202 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
203 unsigned long input_size = (unsigned long) RAND_MAX + 1;
204 unsigned long reject_size = input_size % output_size;
205 unsigned long accept_size = input_size - reject_size; // module*accept_size
207 // Use rejection in order to avoid skew
211 x = (unsigned long) random();
213 x = (unsigned long) rand();
215 } while( x >= accept_size );
216 return min + (x % output_size);
219 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
221 if (!MC_is_active() && !MC_record_path)
222 return prng_random(min, max);
223 return simcall->mc_value;
229 void handle_simcall(smx_simcall_t req, int value)
232 SIMIX_simcall_handle(req, value);
234 if (mc_mode == MC_MODE_CLIENT) {
235 SIMIX_simcall_handle(req, value);
239 for (auto& pi : mc_model_checker->process().smx_process_infos)
240 if (req == &pi.copy.simcall) {
241 mc_model_checker->simcall_handle(
242 mc_model_checker->process(), pi.copy.pid, value);
246 xbt_die("Could not find the request");