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;
43 case SIMCALL_COMM_WAIT:
44 /* FIXME: check also that src and dst processes are not suspended */
45 act = simcall_comm_wait__get__comm(req);
46 if (simcall_comm_wait__get__timeout(req) >= 0) {
47 /* If it has a timeout it will be always be enabled, because even if the
48 * communication is not ready, it can timeout and won't block. */
49 if (_sg_mc_timeout == 1)
52 /* On the other hand if it hasn't a timeout, check if the comm is ready.*/
53 if (act->comm.detached && act->comm.src_proc == NULL
54 && act->comm.type == SIMIX_COMM_READY)
55 return (act->comm.dst_proc != NULL);
57 return (act->comm.src_proc && act->comm.dst_proc);
59 case SIMCALL_COMM_WAITANY:
60 /* Check if it has at least one communication ready */
61 xbt_dynar_foreach(simcall_comm_waitany__get__comms(req), index, act)
62 if (act->comm.src_proc && act->comm.dst_proc)
67 /* The rest of the requests are always enabled */
72 int MC_request_is_visible(smx_simcall_t req)
74 return req->call == SIMCALL_COMM_ISEND
75 || req->call == SIMCALL_COMM_IRECV
76 || req->call == SIMCALL_COMM_WAIT
77 || req->call == SIMCALL_COMM_WAITANY
78 || req->call == SIMCALL_COMM_TEST
79 || req->call == SIMCALL_COMM_TESTANY
80 || req->call == SIMCALL_MC_RANDOM
82 || req->call == SIMCALL_MC_SNAPSHOT
83 || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS
88 int MC_random(int min, int max)
90 /*FIXME: return mc_current_state->executed_transition->random.value; */
91 return simcall_mc_random(min, max);
94 static int prng_random(int min, int max)
96 unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1;
97 unsigned long input_size = (unsigned long) RAND_MAX + 1;
98 unsigned long reject_size = input_size % output_size;
99 unsigned long accept_size = input_size - reject_size; // module*accept_size
101 // Use rejection in order to avoid skew
109 } while( x >= accept_size );
110 return min + (x % output_size);
113 int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max)
115 if (!MC_is_active() && !MC_record_path){
116 return prng_random(min, max);
119 return simcall->mc_value;