Proposed fix for coverity #29372
[supertux.git] / src / scripting / time_scheduler.cpp
1 //  SuperTux
2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
3 //
4 //  This program is free software: you can redistribute it and/or modify
5 //  it under the terms of the GNU General Public License as published by
6 //  the Free Software Foundation, either version 3 of the License, or
7 //  (at your option) any later version.
8 //
9 //  This program is distributed in the hope that it will be useful,
10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 //  GNU General Public License for more details.
13 //
14 //  You should have received a copy of the GNU General Public License
15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
16
17 #include <algorithm>
18
19 #include "scripting/scripting.hpp"
20 #include "scripting/squirrel_util.hpp"
21 #include "scripting/time_scheduler.hpp"
22 #include "util/log.hpp"
23
24 namespace scripting {
25
26 TimeScheduler* TimeScheduler::instance = NULL;
27
28 TimeScheduler::TimeScheduler() :
29   schedule()
30 {
31 }
32
33 TimeScheduler::~TimeScheduler()
34 {
35 }
36
37 void
38 TimeScheduler::update(float time)
39 {
40   while(!schedule.empty() && schedule.front().wakeup_time < time) {
41     HSQOBJECT thread_ref = schedule.front().thread_ref;
42
43     sq_pushobject(global_vm, thread_ref);
44     sq_getweakrefval(global_vm, -1);
45
46     HSQUIRRELVM scheduled_vm;
47     if(sq_gettype(global_vm, -1) == OT_THREAD &&
48        SQ_SUCCEEDED(sq_getthread(global_vm, -1, &scheduled_vm))) {
49       if(SQ_FAILED(sq_wakeupvm(scheduled_vm, SQFalse, SQFalse, SQTrue, SQFalse))) {
50         std::ostringstream msg;
51         msg << "Error waking VM: ";
52         sq_getlasterror(scheduled_vm);
53         if(sq_gettype(scheduled_vm, -1) != OT_STRING) {
54           msg << "(no info)";
55         } else {
56           const char* lasterr;
57           sq_getstring(scheduled_vm, -1, &lasterr);
58           msg << lasterr;
59         }
60         log_warning << msg.str() << std::endl;
61         sq_pop(scheduled_vm, 1);
62       }
63     }
64
65     sq_release(global_vm, &thread_ref);
66     sq_pop(global_vm, 2);
67
68     std::pop_heap(schedule.begin(), schedule.end());
69     schedule.pop_back();
70   }
71 }
72
73 void
74 TimeScheduler::schedule_thread(HSQUIRRELVM scheduled_vm, float time)
75 {
76   // create a weakref to the VM
77   SQObject vm_obj = vm_to_object(scheduled_vm);
78   sq_pushobject(global_vm, vm_obj);
79   sq_weakref(global_vm, -1);
80
81   ScheduleEntry entry;
82   if(SQ_FAILED(sq_getstackobj(global_vm, -1, & entry.thread_ref))) {
83     sq_pop(global_vm, 2);
84     throw SquirrelError(global_vm, "Couldn't get thread weakref from vm");
85   }
86   entry.wakeup_time = time;
87
88   sq_addref(global_vm, & entry.thread_ref);
89   sq_pop(global_vm, 2);
90
91   schedule.push_back(entry);
92   std::push_heap(schedule.begin(), schedule.end());
93 }
94
95 }
96
97 /* EOF */