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"
26 using simgrid::mc::remote;
31 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
33 int MC_random(int min, int max)
36 xbt_assert(mc_mode != MC_MODE_SERVER);
37 /* TODO, if the MC is disabled we do not really need to make a simcall for
39 /* FIXME: return mc_current_state->executed_transition->random.value; */
40 return simcall_mc_random(min, max);
46 void MC_wait_for_requests(void)
49 if (mc_mode == MC_MODE_SERVER) {
50 MC_server_wait_client(&mc_model_checker->process());
55 smx_process_t process;
59 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
60 SIMIX_process_runall();
61 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
62 req = &process->simcall;
63 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
64 SIMIX_simcall_handle(req, 0);
69 // Called from both MCer and MCed:
70 int MC_request_is_enabled(smx_simcall_t req)
72 unsigned int index = 0;
73 smx_synchro_t act = 0;
75 s_smx_synchro_t temp_synchro;
82 case SIMCALL_COMM_WAIT:
83 /* FIXME: check also that src and dst processes are not suspended */
84 act = simcall_comm_wait__get__comm(req);
87 // Fetch from MCed memory:
88 if (mc_mode == MC_MODE_SERVER) {
89 mc_model_checker->process().read(&temp_synchro, remote(act));
94 if (simcall_comm_wait__get__timeout(req) >= 0) {
95 /* If it has a timeout it will be always be enabled, because even if the
96 * communication is not ready, it can timeout and won't block. */
97 if (_sg_mc_timeout == 1)
100 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
101 if (act->comm.detached && act->comm.src_proc == NULL
102 && act->comm.type == SIMIX_COMM_READY)
103 return (act->comm.dst_proc != NULL);
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_LOCK: {
150 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
152 s_smx_mutex_t temp_mutex;
153 if (mc_mode == MC_MODE_SERVER) {
154 mc_model_checker->process().read(&temp_mutex, remote(mutex));
158 if(mutex->owner == NULL)
162 // TODO, *(mutex->owner) :/
163 return MC_smx_resolve_process(mutex->owner)->pid ==
164 MC_smx_resolve_process(req->issuer)->pid;
166 return mutex->owner->pid == req->issuer->pid;
171 /* The rest of the requests are always enabled */
176 int MC_request_is_visible(smx_simcall_t req)
178 return req->call == SIMCALL_COMM_ISEND
179 || req->call == SIMCALL_COMM_IRECV
180 || req->call == SIMCALL_COMM_WAIT
181 || req->call == SIMCALL_COMM_WAITANY
182 || req->call == SIMCALL_COMM_TEST
183 || req->call == SIMCALL_COMM_TESTANY
184 || req->call == SIMCALL_MC_RANDOM
185 || req->call == SIMCALL_MUTEX_LOCK
187 || req->call == SIMCALL_MC_SNAPSHOT
188 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
193 static int prng_random(int min, int max)
195 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
196 unsigned long input_size = (unsigned long) RAND_MAX + 1;
197 unsigned long reject_size = input_size % output_size;
198 unsigned long accept_size = input_size - reject_size; // module*accept_size
200 // Use rejection in order to avoid skew
204 x = (unsigned long) random();
206 x = (unsigned long) rand();
208 } while( x >= accept_size );
209 return min + (x % output_size);
212 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
214 if (!MC_is_active() && !MC_record_path){
215 return prng_random(min, max);
218 return simcall->mc_value;
221 void MC_simcall_handle(smx_simcall_t req, int value)
224 SIMIX_simcall_handle(req, value);
226 if (mc_mode == MC_MODE_CLIENT) {
227 SIMIX_simcall_handle(req, value);
232 mc_smx_process_info_t pi = NULL;
234 xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, pi) {
235 if (req == &pi->copy.simcall) {
236 MC_server_simcall_handle(&mc_model_checker->process(), pi->copy.pid, value);
241 xbt_die("Could not find the request");