1 /* Copyright (c) 2008-2014. 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/simix.h>
12 #include "../simix/smx_private.h"
13 #include "mc/mc_record.h"
14 #include "mc/mc_replay.h"
18 #include "mc_process.h"
19 #include "ModelChecker.hpp"
20 #include "mc_protocol.h"
22 #include "mc_server.h"
27 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
29 void MC_wait_for_requests(void)
32 if (mc_mode == MC_MODE_SERVER) {
33 MC_server_wait_client(&mc_model_checker->process());
38 smx_process_t process;
42 while (!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 req = &process->simcall;
46 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
47 SIMIX_simcall_handle(req, 0);
52 // Called from both MCer and MCed:
53 int MC_request_is_enabled(smx_simcall_t req)
55 unsigned int index = 0;
56 smx_synchro_t act = 0;
58 s_smx_synchro_t temp_synchro;
65 case SIMCALL_COMM_WAIT:
66 /* FIXME: check also that src and dst processes are not suspended */
67 act = simcall_comm_wait__get__comm(req);
70 // Fetch from MCed memory:
71 if (mc_mode == MC_MODE_SERVER) {
72 MC_process_read(&mc_model_checker->process(), MC_ADDRESS_SPACE_READ_FLAGS_NONE,
73 &temp_synchro, act, sizeof(temp_synchro),
74 MC_PROCESS_INDEX_ANY);
79 if (simcall_comm_wait__get__timeout(req) >= 0) {
80 /* If it has a timeout it will be always be enabled, because even if the
81 * communication is not ready, it can timeout and won't block. */
82 if (_sg_mc_timeout == 1)
85 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
86 if (act->comm.detached && act->comm.src_proc == NULL
87 && act->comm.type == SIMIX_COMM_READY)
88 return (act->comm.dst_proc != NULL);
90 return (act->comm.src_proc && act->comm.dst_proc);
92 case SIMCALL_COMM_WAITANY: {
95 s_xbt_dynar_t comms_buffer;
97 if (mc_mode == MC_MODE_SERVER) {
99 MC_process_read_simple(&mc_model_checker->process(),
100 &comms_buffer, simcall_comm_waitany__get__comms(req), sizeof(comms_buffer));
101 assert(comms_buffer.elmsize == sizeof(act));
102 buffer_size = comms_buffer.elmsize * comms_buffer.used;
103 comms = &comms_buffer;
105 comms = simcall_comm_waitany__get__comms(req);
107 // Read all the dynar buffer:
108 char buffer[buffer_size];
109 if (mc_mode == MC_MODE_SERVER)
110 MC_process_read_simple(&mc_model_checker->process(),
111 buffer, comms->data, sizeof(buffer));
114 for (index = 0; index < comms->used; ++index) {
116 // Fetch act from MCed memory:
117 if (mc_mode == MC_MODE_SERVER) {
118 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
119 MC_process_read(&mc_model_checker->process(), MC_ADDRESS_SPACE_READ_FLAGS_NONE,
120 &temp_synchro, act, sizeof(temp_synchro),
121 MC_PROCESS_INDEX_ANY);
126 act = xbt_dynar_get_as(comms, index, smx_synchro_t);
127 if (act->comm.src_proc && act->comm.dst_proc)
133 case SIMCALL_MUTEX_LOCK: {
134 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
136 s_smx_mutex_t temp_mutex;
137 if (mc_mode == MC_MODE_SERVER) {
138 MC_process_read(&mc_model_checker->process(), MC_ADDRESS_SPACE_READ_FLAGS_NONE,
139 &temp_mutex, mutex, sizeof(temp_mutex),
140 MC_PROCESS_INDEX_ANY);
144 if(mutex->owner == NULL)
148 // TODO, *(mutex->owner) :/
149 return MC_smx_resolve_process(mutex->owner)->pid ==
150 MC_smx_resolve_process(req->issuer)->pid;
152 return mutex->owner->pid == req->issuer->pid;
157 /* The rest of the requests are always enabled */
162 int MC_request_is_visible(smx_simcall_t req)
164 return req->call == SIMCALL_COMM_ISEND
165 || req->call == SIMCALL_COMM_IRECV
166 || req->call == SIMCALL_COMM_WAIT
167 || req->call == SIMCALL_COMM_WAITANY
168 || req->call == SIMCALL_COMM_TEST
169 || req->call == SIMCALL_COMM_TESTANY
170 || req->call == SIMCALL_MC_RANDOM
171 || req->call == SIMCALL_MUTEX_LOCK
173 || req->call == SIMCALL_MC_SNAPSHOT
174 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
179 int MC_random(int min, int max)
181 /*FIXME: return mc_current_state->executed_transition->random.value; */
182 return simcall_mc_random(min, max);
185 static int prng_random(int min, int max)
187 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
188 unsigned long input_size = (unsigned long) RAND_MAX + 1;
189 unsigned long reject_size = input_size % output_size;
190 unsigned long accept_size = input_size - reject_size; // module*accept_size
192 // Use rejection in order to avoid skew
196 x = (unsigned long) random();
198 x = (unsigned long) rand();
200 } while( x >= accept_size );
201 return min + (x % output_size);
204 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
206 if (!MC_is_active() && !MC_record_path){
207 return prng_random(min, max);
210 return simcall->mc_value;
213 void MC_simcall_handle(smx_simcall_t req, int value)
216 SIMIX_simcall_handle(req, value);
218 if (mc_mode == MC_MODE_CLIENT) {
219 SIMIX_simcall_handle(req, value);
224 mc_smx_process_info_t pi = NULL;
226 xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, pi) {
227 if (req == &pi->copy.simcall) {
228 MC_server_simcall_handle(&mc_model_checker->process(), pi->copy.pid, value);
233 xbt_die("Could not find the request");