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_model_checker->process().read_bytes(
73 &temp_synchro, sizeof(temp_synchro), (std::uint64_t)act);
78 if (simcall_comm_wait__get__timeout(req) >= 0) {
79 /* If it has a timeout it will be always be enabled, because even if the
80 * communication is not ready, it can timeout and won't block. */
81 if (_sg_mc_timeout == 1)
84 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
85 if (act->comm.detached && act->comm.src_proc == NULL
86 && act->comm.type == SIMIX_COMM_READY)
87 return (act->comm.dst_proc != NULL);
89 return (act->comm.src_proc && act->comm.dst_proc);
91 case SIMCALL_COMM_WAITANY: {
95 s_xbt_dynar_t comms_buffer;
96 size_t buffer_size = 0;
97 if (mc_mode == MC_MODE_SERVER) {
99 mc_model_checker->process().read_bytes(
100 &comms_buffer, sizeof(comms_buffer),
101 (std::uint64_t)simcall_comm_waitany__get__comms(req));
102 assert(comms_buffer.elmsize == sizeof(act));
103 buffer_size = comms_buffer.elmsize * comms_buffer.used;
104 comms = &comms_buffer;
106 comms = simcall_comm_waitany__get__comms(req);
108 // Read all the dynar buffer:
109 char buffer[buffer_size];
110 if (mc_mode == MC_MODE_SERVER)
111 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
112 (std::uint64_t)comms->data);
114 comms = simcall_comm_waitany__get__comms(req);
117 for (index = 0; index < comms->used; ++index) {
119 // Fetch act from MCed memory:
120 if (mc_mode == MC_MODE_SERVER) {
121 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
122 mc_model_checker->process().read_bytes(
123 &temp_synchro, sizeof(temp_synchro), (std::uint64_t)act);
128 act = xbt_dynar_get_as(comms, index, smx_synchro_t);
129 if (act->comm.src_proc && act->comm.dst_proc)
135 case SIMCALL_MUTEX_LOCK: {
136 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
138 s_smx_mutex_t temp_mutex;
139 if (mc_mode == MC_MODE_SERVER) {
140 mc_model_checker->process().read_bytes(
141 &temp_mutex, sizeof(temp_mutex), (std::uint64_t)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");