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"
13 XBT_LOG_NEW_CATEGORY(mc, "All MC categories");
16 * \brief Schedules all the process that are ready to run
18 void MC_wait_for_requests(void)
20 smx_process_t process;
24 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
25 SIMIX_process_runall();
26 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
27 req = &process->simcall;
28 if (req->call != SIMCALL_NONE && !MC_request_is_visible(req))
29 SIMIX_simcall_handle(req, 0);
34 int MC_request_is_enabled(smx_simcall_t req)
36 unsigned int index = 0;
37 smx_synchro_t act = 0;
38 smx_mutex_t mutex = NULL;
44 case SIMCALL_COMM_WAIT:
45 /* FIXME: check also that src and dst processes are not suspended */
46 act = simcall_comm_wait__get__comm(req);
47 if (simcall_comm_wait__get__timeout(req) >= 0) {
48 /* If it has a timeout it will be always be enabled, because even if the
49 * communication is not ready, it can timeout and won't block. */
50 if (_sg_mc_timeout == 1)
53 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
54 if (act->comm.detached && act->comm.src_proc == NULL
55 && act->comm.type == SIMIX_COMM_READY)
56 return (act->comm.dst_proc != NULL);
58 return (act->comm.src_proc && act->comm.dst_proc);
60 case SIMCALL_COMM_WAITANY:
61 /* Check if it has at least one communication ready */
62 xbt_dynar_foreach(simcall_comm_waitany__get__comms(req), index, act)
63 if (act->comm.src_proc && act->comm.dst_proc)
67 case SIMCALL_MUTEX_LOCK:
68 mutex = simcall_mutex_lock__get__mutex(req);
69 if(mutex->owner == NULL)
72 return (mutex->owner->pid == req->issuer->pid);
75 /* The rest of the requests are always enabled */
80 int MC_request_is_visible(smx_simcall_t req)
82 return req->call == SIMCALL_COMM_ISEND
83 || req->call == SIMCALL_COMM_IRECV
84 || req->call == SIMCALL_COMM_WAIT
85 || req->call == SIMCALL_COMM_WAITANY
86 || req->call == SIMCALL_COMM_TEST
87 || req->call == SIMCALL_COMM_TESTANY
88 || req->call == SIMCALL_MC_RANDOM
89 || req->call == SIMCALL_MUTEX_LOCK
91 || req->call == SIMCALL_MC_SNAPSHOT
92 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
97 int MC_random(int min, int max)
99 /*FIXME: return mc_current_state->executed_transition->random.value; */
100 return simcall_mc_random(min, max);
103 static int prng_random(int min, int max)
105 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
106 unsigned long input_size = (unsigned long) RAND_MAX + 1;
107 unsigned long reject_size = input_size % output_size;
108 unsigned long accept_size = input_size - reject_size; // module*accept_size
110 // Use rejection in order to avoid skew
118 } while( x >= accept_size );
119 return min + (x % output_size);
122 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
124 if (!MC_is_active() && !MC_record_path){
125 return prng_random(min, max);
128 return simcall->mc_value;