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 void MC_wait_for_requests(void)
36 if (mc_mode == MC_MODE_SERVER) {
37 MC_server_wait_client(&mc_model_checker->process());
42 smx_process_t process;
46 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
47 SIMIX_process_runall();
48 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
49 req = &process->simcall;
50 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
51 SIMIX_simcall_handle(req, 0);
56 // Called from both MCer and MCed:
57 int MC_request_is_enabled(smx_simcall_t req)
59 unsigned int index = 0;
60 smx_synchro_t act = 0;
62 s_smx_synchro_t temp_synchro;
69 case SIMCALL_COMM_WAIT:
70 /* FIXME: check also that src and dst processes are not suspended */
71 act = simcall_comm_wait__get__comm(req);
74 // Fetch from MCed memory:
75 if (mc_mode == MC_MODE_SERVER) {
76 mc_model_checker->process().read(&temp_synchro, remote(act));
81 if (simcall_comm_wait__get__timeout(req) >= 0) {
82 /* If it has a timeout it will be always be enabled, because even if the
83 * communication is not ready, it can timeout and won't block. */
84 if (_sg_mc_timeout == 1)
87 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
88 if (act->comm.detached && act->comm.src_proc == NULL
89 && act->comm.type == SIMIX_COMM_READY)
90 return (act->comm.dst_proc != NULL);
92 return (act->comm.src_proc && act->comm.dst_proc);
94 case SIMCALL_COMM_WAITANY: {
98 s_xbt_dynar_t comms_buffer;
99 size_t buffer_size = 0;
100 if (mc_mode == MC_MODE_SERVER) {
102 mc_model_checker->process().read(
103 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
104 assert(comms_buffer.elmsize == sizeof(act));
105 buffer_size = comms_buffer.elmsize * comms_buffer.used;
106 comms = &comms_buffer;
108 comms = simcall_comm_waitany__get__comms(req);
110 // Read all the dynar buffer:
111 char buffer[buffer_size];
112 if (mc_mode == MC_MODE_SERVER)
113 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
114 remote(comms->data));
116 comms = simcall_comm_waitany__get__comms(req);
119 for (index = 0; index < comms->used; ++index) {
121 // Fetch act from MCed memory:
122 if (mc_mode == MC_MODE_SERVER) {
123 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
124 mc_model_checker->process().read(&temp_synchro, remote(act));
129 act = xbt_dynar_get_as(comms, index, smx_synchro_t);
130 if (act->comm.src_proc && act->comm.dst_proc)
136 case SIMCALL_MUTEX_LOCK: {
137 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
139 s_smx_mutex_t temp_mutex;
140 if (mc_mode == MC_MODE_SERVER) {
141 mc_model_checker->process().read(&temp_mutex, remote(mutex));
145 if(mutex->owner == NULL)
149 // TODO, *(mutex->owner) :/
150 return MC_smx_resolve_process(mutex->owner)->pid ==
151 MC_smx_resolve_process(req->issuer)->pid;
153 return mutex->owner->pid == req->issuer->pid;
158 /* The rest of the requests are always enabled */
163 int MC_request_is_visible(smx_simcall_t req)
165 return req->call == SIMCALL_COMM_ISEND
166 || req->call == SIMCALL_COMM_IRECV
167 || req->call == SIMCALL_COMM_WAIT
168 || req->call == SIMCALL_COMM_WAITANY
169 || req->call == SIMCALL_COMM_TEST
170 || req->call == SIMCALL_COMM_TESTANY
171 || req->call == SIMCALL_MC_RANDOM
172 || req->call == SIMCALL_MUTEX_LOCK
174 || req->call == SIMCALL_MC_SNAPSHOT
175 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
180 int MC_random(int min, int max)
182 /*FIXME: return mc_current_state->executed_transition->random.value; */
183 return simcall_mc_random(min, max);
186 static int prng_random(int min, int max)
188 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
189 unsigned long input_size = (unsigned long) RAND_MAX + 1;
190 unsigned long reject_size = input_size % output_size;
191 unsigned long accept_size = input_size - reject_size; // module*accept_size
193 // Use rejection in order to avoid skew
197 x = (unsigned long) random();
199 x = (unsigned long) rand();
201 } while( x >= accept_size );
202 return min + (x % output_size);
205 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
207 if (!MC_is_active() && !MC_record_path){
208 return prng_random(min, max);
211 return simcall->mc_value;
214 void MC_simcall_handle(smx_simcall_t req, int value)
217 SIMIX_simcall_handle(req, value);
219 if (mc_mode == MC_MODE_CLIENT) {
220 SIMIX_simcall_handle(req, value);
225 mc_smx_process_info_t pi = NULL;
227 xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, pi) {
228 if (req == &pi->copy.simcall) {
229 MC_server_simcall_handle(&mc_model_checker->process(), pi->copy.pid, value);
234 xbt_die("Could not find the request");