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_config.h>
12 #include <xbt/asserts.h>
13 #include <xbt/dynar.h>
15 #include <simgrid/simix.h>
17 #include "src/mc/mc_base.h"
18 #include "src/simix/smx_private.h"
19 #include "src/mc/mc_replay.h"
21 #include "src/mc/mc_protocol.h"
24 #include "src/mc/Process.hpp"
25 #include "src/mc/ModelChecker.hpp"
26 #include "src/mc/mc_smx.h"
30 using simgrid::mc::remote;
35 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
37 int MC_random(int min, int max)
39 xbt_assert(mc_mode != MC_MODE_SERVER);
40 /* TODO, if the MC is disabled we do not really need to make a simcall for
42 /* FIXME: return mc_current_state->executed_transition->random.value; */
43 return simcall_mc_random(min, max);
46 void MC_wait_for_requests(void)
48 assert(mc_mode != MC_MODE_SERVER);
50 smx_process_t process;
54 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
55 SIMIX_process_runall();
56 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
57 req = &process->simcall;
58 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
59 SIMIX_simcall_handle(req, 0);
64 // Called from both MCer and MCed:
65 int MC_request_is_enabled(smx_simcall_t req)
67 unsigned int index = 0;
68 smx_synchro_t act = 0;
70 s_smx_synchro_t temp_synchro;
77 case SIMCALL_COMM_WAIT:
78 /* FIXME: check also that src and dst processes are not suspended */
79 act = simcall_comm_wait__get__comm(req);
82 // Fetch from MCed memory:
83 if (mc_mode == MC_MODE_SERVER) {
84 mc_model_checker->process().read(&temp_synchro, remote(act));
89 if (simcall_comm_wait__get__timeout(req) >= 0) {
90 /* If it has a timeout it will be always be enabled, because even if the
91 * communication is not ready, it can timeout and won't block. */
92 if (_sg_mc_timeout == 1)
95 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
96 if (act->comm.detached && act->comm.src_proc == nullptr
97 && act->comm.type == SIMIX_COMM_READY)
98 return (act->comm.dst_proc != nullptr);
100 return (act->comm.src_proc && act->comm.dst_proc);
102 case SIMCALL_COMM_WAITANY: {
106 s_xbt_dynar_t comms_buffer;
107 size_t buffer_size = 0;
108 if (mc_mode == MC_MODE_SERVER) {
110 mc_model_checker->process().read(
111 &comms_buffer, remote(simcall_comm_waitany__get__comms(req)));
112 assert(comms_buffer.elmsize == sizeof(act));
113 buffer_size = comms_buffer.elmsize * comms_buffer.used;
114 comms = &comms_buffer;
116 comms = simcall_comm_waitany__get__comms(req);
118 // Read all the dynar buffer:
119 char buffer[buffer_size];
120 if (mc_mode == MC_MODE_SERVER)
121 mc_model_checker->process().read_bytes(buffer, sizeof(buffer),
122 remote(comms->data));
124 comms = simcall_comm_waitany__get__comms(req);
127 for (index = 0; index < comms->used; ++index) {
129 // Fetch act from MCed memory:
130 if (mc_mode == MC_MODE_SERVER) {
131 memcpy(&act, buffer + comms->elmsize * index, sizeof(act));
132 mc_model_checker->process().read(&temp_synchro, remote(act));
137 act = xbt_dynar_get_as(comms, index, smx_synchro_t);
138 if (act->comm.src_proc && act->comm.dst_proc)
144 case SIMCALL_MUTEX_TRYLOCK:
147 case SIMCALL_MUTEX_LOCK: {
148 smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req);
150 s_smx_mutex_t temp_mutex;
151 if (mc_mode == MC_MODE_SERVER) {
152 mc_model_checker->process().read(&temp_mutex, remote(mutex));
156 if(mutex->owner == nullptr)
160 // TODO, *(mutex->owner) :/
161 return MC_smx_resolve_process(mutex->owner)->pid ==
162 MC_smx_resolve_process(req->issuer)->pid;
164 return mutex->owner->pid == req->issuer->pid;
169 /* The rest of the requests are always enabled */
174 int MC_request_is_visible(smx_simcall_t req)
176 return req->call == SIMCALL_COMM_ISEND
177 || req->call == SIMCALL_COMM_IRECV
178 || req->call == SIMCALL_COMM_WAIT
179 || req->call == SIMCALL_COMM_WAITANY
180 || req->call == SIMCALL_COMM_TEST
181 || req->call == SIMCALL_COMM_TESTANY
182 || req->call == SIMCALL_MC_RANDOM
183 || req->call == SIMCALL_MUTEX_LOCK
184 || req->call == SIMCALL_MUTEX_TRYLOCK
186 || req->call == SIMCALL_MC_SNAPSHOT
187 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
192 static int prng_random(int min, int max)
194 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
195 unsigned long input_size = (unsigned long) RAND_MAX + 1;
196 unsigned long reject_size = input_size % output_size;
197 unsigned long accept_size = input_size - reject_size; // module*accept_size
199 // Use rejection in order to avoid skew
203 x = (unsigned long) random();
205 x = (unsigned long) rand();
207 } while( x >= accept_size );
208 return min + (x % output_size);
211 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
213 if (!MC_is_active() && !MC_record_path){
214 return prng_random(min, max);
217 return simcall->mc_value;
220 void MC_simcall_handle(smx_simcall_t req, int value)
223 SIMIX_simcall_handle(req, value);
225 if (mc_mode == MC_MODE_CLIENT) {
226 SIMIX_simcall_handle(req, value);
231 mc_smx_process_info_t pi = nullptr;
233 xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, pi) {
234 if (req == &pi->copy.simcall) {
235 mc_model_checker->simcall_handle(
236 mc_model_checker->process(), pi->copy.pid, value);
241 xbt_die("Could not find the request");