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/simix.h>
11 #include "src/mc/mc_base.h"
12 #include "src/simix/smx_private.h"
13 #include "src/mc/mc_record.h"
14 #include "src/mc/mc_replay.h"
16 #include "src/mc/mc_protocol.h"
19 #include "src/mc/Process.hpp"
20 #include "src/mc/ModelChecker.hpp"
21 #include "src/mc/mc_smx.h"
25 using simgrid::mc::remote;
30 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
32 int MC_random(int min, int max)
34 xbt_assert(mc_mode != MC_MODE_SERVER);
35 /* TODO, if the MC is disabled we do not really need to make a simcall for
37 /* FIXME: return mc_current_state->executed_transition->random.value; */
38 return simcall_mc_random(min, max);
41 void MC_wait_for_requests(void)
43 assert(mc_mode != MC_MODE_SERVER);
45 smx_process_t process;
49 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
50 SIMIX_process_runall();
51 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
52 req = &process->simcall;
53 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
54 SIMIX_simcall_handle(req, 0);
59 // Called from both MCer and MCed:
60 int MC_request_is_enabled(smx_simcall_t req)
62 unsigned int index = 0;
63 smx_synchro_t act = 0;
65 s_smx_synchro_t temp_synchro;
72 case SIMCALL_COMM_WAIT:
73 /* FIXME: check also that src and dst processes are not suspended */
74 act = simcall_comm_wait__get__comm(req);
77 // Fetch from MCed memory:
78 if (mc_mode == MC_MODE_SERVER) {
79 mc_model_checker->process().read(&temp_synchro, remote(act));
84 if (simcall_comm_wait__get__timeout(req) >= 0) {
85 /* If it has a timeout it will be always be enabled, because even if the
86 * communication is not ready, it can timeout and won't block. */
87 if (_sg_mc_timeout == 1)
90 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
91 if (act->comm.detached && act->comm.src_proc == NULL
92 && act->comm.type == SIMIX_COMM_READY)
93 return (act->comm.dst_proc != NULL);
95 return (act->comm.src_proc && act->comm.dst_proc);
97 case SIMCALL_COMM_WAITANY: {
101 s_xbt_dynar_t comms_buffer;
102 size_t buffer_size = 0;
103 if (mc_mode == MC_MODE_SERVER) {
105 mc_model_checker->process().read(
106 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
107 assert(comms_buffer.elmsize == sizeof(act));
108 buffer_size = comms_buffer.elmsize * comms_buffer.used;
109 comms = &comms_buffer;
111 comms = simcall_comm_waitany__get__comms(req);
113 // Read all the dynar buffer:
114 char buffer[buffer_size];
115 if (mc_mode == MC_MODE_SERVER)
116 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
117 remote(comms->data));
119 comms = simcall_comm_waitany__get__comms(req);
122 for (index = 0; index < comms->used; ++index) {
124 // Fetch act from MCed memory:
125 if (mc_mode == MC_MODE_SERVER) {
126 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
127 mc_model_checker->process().read(&temp_synchro, remote(act));
132 act = xbt_dynar_get_as(comms, index, smx_synchro_t);
133 if (act->comm.src_proc && act->comm.dst_proc)
139 case SIMCALL_MUTEX_TRYLOCK:
142 case SIMCALL_MUTEX_LOCK: {
143 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
145 s_smx_mutex_t temp_mutex;
146 if (mc_mode == MC_MODE_SERVER) {
147 mc_model_checker->process().read(&temp_mutex, remote(mutex));
151 if(mutex->owner == NULL)
155 // TODO, *(mutex->owner) :/
156 return MC_smx_resolve_process(mutex->owner)->pid ==
157 MC_smx_resolve_process(req->issuer)->pid;
159 return mutex->owner->pid == req->issuer->pid;
164 /* The rest of the requests are always enabled */
169 int MC_request_is_visible(smx_simcall_t req)
171 return req->call == SIMCALL_COMM_ISEND
172 || req->call == SIMCALL_COMM_IRECV
173 || req->call == SIMCALL_COMM_WAIT
174 || req->call == SIMCALL_COMM_WAITANY
175 || req->call == SIMCALL_COMM_TEST
176 || req->call == SIMCALL_COMM_TESTANY
177 || req->call == SIMCALL_MC_RANDOM
178 || req->call == SIMCALL_MUTEX_LOCK
179 || req->call == SIMCALL_MUTEX_TRYLOCK
181 || req->call == SIMCALL_MC_SNAPSHOT
182 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
187 static int prng_random(int min, int max)
189 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
190 unsigned long input_size = (unsigned long) RAND_MAX + 1;
191 unsigned long reject_size = input_size % output_size;
192 unsigned long accept_size = input_size - reject_size; // module*accept_size
194 // Use rejection in order to avoid skew
198 x = (unsigned long) random();
200 x = (unsigned long) rand();
202 } while( x >= accept_size );
203 return min + (x % output_size);
206 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
208 if (!MC_is_active() && !MC_record_path){
209 return prng_random(min, max);
212 return simcall->mc_value;
215 void MC_simcall_handle(smx_simcall_t req, int value)
218 SIMIX_simcall_handle(req, value);
220 if (mc_mode == MC_MODE_CLIENT) {
221 SIMIX_simcall_handle(req, value);
226 mc_smx_process_info_t pi = NULL;
228 xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, pi) {
229 if (req == &pi->copy.simcall) {
230 mc_model_checker->simcall_handle(
231 mc_model_checker->process(), pi->copy.pid, value);
236 xbt_die("Could not find the request");