1 /* Copyright (c) 2008-2014. 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. */
7 #include <simgrid/simix.h>
10 #include "../simix/smx_private.h"
11 #include "mc_record.h"
14 #include "mc_process.h"
15 #include "mc_model_checker.h"
16 #include "mc_protocol.h"
19 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
21 void MC_wait_for_requests(void)
23 smx_process_t process;
27 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
28 SIMIX_process_runall();
29 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
30 req = &process->simcall;
31 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
32 SIMIX_simcall_handle(req, 0);
37 int MC_request_is_enabled(smx_simcall_t req)
39 unsigned int index = 0;
40 smx_synchro_t act = 0;
42 s_smx_synchro_t temp_synchro;
44 smx_mutex_t mutex = NULL;
50 case SIMCALL_COMM_WAIT:
51 /* FIXME: check also that src and dst processes are not suspended */
52 act = simcall_comm_wait__get__comm(req);
55 // Fetch from MCed memory:
56 if (!MC_process_is_self(&mc_model_checker->process)) {
57 MC_process_read(&mc_model_checker->process, MC_PROCESS_NO_FLAG,
58 &temp_synchro, act, sizeof(temp_synchro),
59 MC_PROCESS_INDEX_ANY);
64 if (simcall_comm_wait__get__timeout(req) >= 0) {
65 /* If it has a timeout it will be always be enabled, because even if the
66 * communication is not ready, it can timeout and won't block. */
67 if (_sg_mc_timeout == 1)
70 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
71 if (act->comm.detached && act->comm.src_proc == NULL
72 && act->comm.type == SIMIX_COMM_READY)
73 return (act->comm.dst_proc != NULL);
75 return (act->comm.src_proc && act->comm.dst_proc);
77 case SIMCALL_COMM_WAITANY:
78 /* Check if it has at least one communication ready */
79 xbt_dynar_foreach(simcall_comm_waitany__get__comms(req), index, act) {
82 // Fetch from MCed memory:
83 if (!MC_process_is_self(&mc_model_checker->process)) {
84 MC_process_read(&mc_model_checker->process, MC_PROCESS_NO_FLAG,
85 &temp_synchro, act, sizeof(temp_synchro),
86 MC_PROCESS_INDEX_ANY);
91 if (act->comm.src_proc && act->comm.dst_proc)
96 case SIMCALL_MUTEX_LOCK:
97 mutex = simcall_mutex_lock__get__mutex(req);
98 if(mutex->owner == NULL)
101 return (mutex->owner->pid == req->issuer->pid);
104 /* The rest of the requests are always enabled */
109 int MC_request_is_visible(smx_simcall_t req)
111 return req->call == SIMCALL_COMM_ISEND
112 || req->call == SIMCALL_COMM_IRECV
113 || req->call == SIMCALL_COMM_WAIT
114 || req->call == SIMCALL_COMM_WAITANY
115 || req->call == SIMCALL_COMM_TEST
116 || req->call == SIMCALL_COMM_TESTANY
117 || req->call == SIMCALL_MC_RANDOM
118 || req->call == SIMCALL_MUTEX_LOCK
120 || req->call == SIMCALL_MC_SNAPSHOT
121 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
126 int MC_random(int min, int max)
128 /*FIXME: return mc_current_state->executed_transition->random.value; */
129 return simcall_mc_random(min, max);
132 static int prng_random(int min, int max)
134 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
135 unsigned long input_size = (unsigned long) RAND_MAX + 1;
136 unsigned long reject_size = input_size % output_size;
137 unsigned long accept_size = input_size - reject_size; // module*accept_size
139 // Use rejection in order to avoid skew
147 } while( x >= accept_size );
148 return min + (x % output_size);
151 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
153 if (!MC_is_active() && !MC_record_path){
154 return prng_random(min, max);
157 return simcall->mc_value;