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 /* FIXME: return mc_current_state->executed_transition->random.value; */
42 return simcall_mc_random(min, max);
48 void wait_for_requests(void)
50 assert(mc_mode != MC_MODE_SERVER);
52 smx_process_t process;
56 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
57 SIMIX_process_runall();
58 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
59 req = &process->simcall;
60 if (req->call != SIMCALL_NONE && !simgrid::mc::request_is_visible(req))
61 SIMIX_simcall_handle(req, 0);
66 // Called from both MCer and MCed:
67 bool request_is_enabled(smx_simcall_t req)
69 unsigned int index = 0;
70 smx_synchro_t act = 0;
72 s_smx_synchro_t temp_synchro;
79 case SIMCALL_COMM_WAIT:
80 /* FIXME: check also that src and dst processes are not suspended */
81 act = simcall_comm_wait__get__comm(req);
84 // Fetch from MCed memory:
85 if (mc_mode == MC_MODE_SERVER) {
86 mc_model_checker->process().read(&temp_synchro, remote(act));
91 if (simcall_comm_wait__get__timeout(req) >= 0) {
92 /* If it has a timeout it will be always be enabled, because even if the
93 * communication is not ready, it can timeout and won't block. */
94 if (_sg_mc_timeout == 1)
97 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
98 else if (act->comm.detached && act->comm.src_proc == nullptr
99 && act->comm.type == SIMIX_COMM_READY)
100 return (act->comm.dst_proc != nullptr);
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 == nullptr)
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 bool 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
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);
215 return simcall->mc_value;
221 void handle_simcall(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);
231 for (auto& pi : mc_model_checker->process().smx_process_infos)
232 if (req == &pi.copy.simcall) {
233 mc_model_checker->simcall_handle(
234 mc_model_checker->process(), pi.copy.pid, value);
238 xbt_die("Could not find the request");