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/mc_request.h"
25 #include "src/mc/Process.hpp"
26 #include "src/mc/ModelChecker.hpp"
27 #include "src/mc/mc_smx.h"
31 using simgrid::mc::remote;
34 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
36 int MC_random(int min, int max)
38 xbt_assert(mc_mode != MC_MODE_SERVER);
39 /* TODO, if the MC is disabled we do not really need to make a simcall for
41 return simcall_mc_random(min, max);
47 void wait_for_requests(void)
49 assert(mc_mode != MC_MODE_SERVER);
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 && !simgrid::mc::request_is_visible(req))
60 SIMIX_simcall_handle(req, 0);
65 // Called from both MCer and MCed:
66 bool 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 else if (act->comm.detached && act->comm.src_proc == nullptr
98 && act->comm.type == SIMIX_COMM_READY)
99 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));
157 if(mutex->owner == nullptr)
160 else if (mc_mode == MC_MODE_SERVER) {
161 simgrid::mc::Process& modelchecked = mc_model_checker->process();
162 // TODO, *(mutex->owner) :/
163 return modelchecked.resolveProcess(simgrid::mc::remote(mutex->owner))->pid
164 == modelchecked.resolveProcess(simgrid::mc::remote(req->issuer))->pid;
168 return mutex->owner->pid == req->issuer->pid;
172 /* The rest of the requests are always enabled */
177 bool request_is_visible(smx_simcall_t req)
179 return req->call == SIMCALL_COMM_ISEND
180 || req->call == SIMCALL_COMM_IRECV
181 || req->call == SIMCALL_COMM_WAIT
182 || req->call == SIMCALL_COMM_WAITANY
183 || req->call == SIMCALL_COMM_TEST
184 || req->call == SIMCALL_COMM_TESTANY
185 || req->call == SIMCALL_MC_RANDOM
186 || req->call == SIMCALL_MUTEX_LOCK
187 || req->call == SIMCALL_MUTEX_TRYLOCK
194 static int prng_random(int min, int max)
196 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
197 unsigned long input_size = (unsigned long) RAND_MAX + 1;
198 unsigned long reject_size = input_size % output_size;
199 unsigned long accept_size = input_size - reject_size; // module*accept_size
201 // Use rejection in order to avoid skew
205 x = (unsigned long) random();
207 x = (unsigned long) rand();
209 } while( x >= accept_size );
210 return min + (x % output_size);
213 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
215 if (!MC_is_active() && !MC_record_path)
216 return prng_random(min, max);
217 return simcall->mc_value;