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>
12 #include "../simix/smx_private.h"
13 #include "mc/mc_record.h"
14 #include "mc/mc_replay.h"
16 #include "mc_protocol.h"
19 #include "mc/Process.hpp"
20 #include "mc/ModelChecker.hpp"
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)
35 xbt_assert(mc_mode != MC_MODE_SERVER);
36 /* TODO, if the MC is disabled we do not really need to make a simcall for
38 /* FIXME: return mc_current_state->executed_transition->random.value; */
39 return simcall_mc_random(min, max);
42 void MC_wait_for_requests(void)
45 if (mc_mode == MC_MODE_SERVER) {
46 MC_server_wait_client(&mc_model_checker->process());
51 smx_process_t process;
55 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
56 SIMIX_process_runall();
57 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
58 req = &process->simcall;
59 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
60 SIMIX_simcall_handle(req, 0);
65 // Called from both MCer and MCed:
66 int MC_request_is_enabled(smx_simcall_t req)
68 unsigned int index = 0;
69 smx_synchro_t act = 0;
71 s_smx_synchro_t temp_synchro;
78 case SIMCALL_COMM_WAIT:
79 /* FIXME: check also that src and dst processes are not suspended */
80 act = simcall_comm_wait__get__comm(req);
83 // Fetch from MCed memory:
84 if (mc_mode == MC_MODE_SERVER) {
85 mc_model_checker->process().read(&temp_synchro, remote(act));
90 if (simcall_comm_wait__get__timeout(req) >= 0) {
91 /* If it has a timeout it will be always be enabled, because even if the
92 * communication is not ready, it can timeout and won't block. */
93 if (_sg_mc_timeout == 1)
96 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
97 if (act->comm.detached && act->comm.src_proc == NULL
98 && act->comm.type == SIMIX_COMM_READY)
99 return (act->comm.dst_proc != NULL);
101 return (act->comm.src_proc && act->comm.dst_proc);
103 case SIMCALL_COMM_WAITANY: {
107 s_xbt_dynar_t comms_buffer;
108 size_t buffer_size = 0;
109 if (mc_mode == MC_MODE_SERVER) {
111 mc_model_checker->process().read(
112 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
113 assert(comms_buffer.elmsize == sizeof(act));
114 buffer_size = comms_buffer.elmsize * comms_buffer.used;
115 comms = &comms_buffer;
117 comms = simcall_comm_waitany__get__comms(req);
119 // Read all the dynar buffer:
120 char buffer[buffer_size];
121 if (mc_mode == MC_MODE_SERVER)
122 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
123 remote(comms->data));
125 comms = simcall_comm_waitany__get__comms(req);
128 for (index = 0; index < comms->used; ++index) {
130 // Fetch act from MCed memory:
131 if (mc_mode == MC_MODE_SERVER) {
132 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
133 mc_model_checker->process().read(&temp_synchro, remote(act));
138 act = xbt_dynar_get_as(comms, index, smx_synchro_t);
139 if (act->comm.src_proc && act->comm.dst_proc)
145 case SIMCALL_MUTEX_TRYLOCK:
148 case SIMCALL_MUTEX_LOCK: {
149 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
151 s_smx_mutex_t temp_mutex;
152 if (mc_mode == MC_MODE_SERVER) {
153 mc_model_checker->process().read(&temp_mutex, remote(mutex));
157 if(mutex->owner == NULL)
161 // TODO, *(mutex->owner) :/
162 return MC_smx_resolve_process(mutex->owner)->pid ==
163 MC_smx_resolve_process(req->issuer)->pid;
165 return mutex->owner->pid == req->issuer->pid;
170 /* The rest of the requests are always enabled */
175 int MC_request_is_visible(smx_simcall_t req)
177 return req->call == SIMCALL_COMM_ISEND
178 || req->call == SIMCALL_COMM_IRECV
179 || req->call == SIMCALL_COMM_WAIT
180 || req->call == SIMCALL_COMM_WAITANY
181 || req->call == SIMCALL_COMM_TEST
182 || req->call == SIMCALL_COMM_TESTANY
183 || req->call == SIMCALL_MC_RANDOM
184 || req->call == SIMCALL_MUTEX_LOCK
185 || req->call == SIMCALL_MUTEX_TRYLOCK
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");