mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-25 11:15:00 +00:00
130 lines
3.2 KiB
C++
130 lines
3.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
|
|
*
|
|
* ScummVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the COPYRIGHT
|
|
* file distributed with this source distribution.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* $URL$
|
|
* $Id$
|
|
*
|
|
* To ensure exclusive use of resources and exclusive control responsibilities.
|
|
*/
|
|
|
|
#include "common/util.h"
|
|
|
|
#include "tinsel/sched.h"
|
|
#include "tinsel/token.h"
|
|
|
|
namespace Tinsel {
|
|
|
|
//----------------- LOCAL GLOBAL DATA --------------------
|
|
|
|
struct Token {
|
|
PROCESS *proc;
|
|
};
|
|
|
|
static Token tokens[NUMTOKENS];
|
|
|
|
|
|
/**
|
|
* Release all tokens held by this process, and kill the process.
|
|
*/
|
|
static void TerminateProcess(PROCESS *tProc) {
|
|
|
|
// Release tokens held by the process
|
|
for (int i = 0; i < NUMTOKENS; i++) {
|
|
if (tokens[i].proc == tProc) {
|
|
tokens[i].proc = NULL;
|
|
}
|
|
}
|
|
|
|
// Kill the process
|
|
g_scheduler->killProcess(tProc);
|
|
}
|
|
|
|
/**
|
|
* Gain control of the CONTROL token if it is free.
|
|
*/
|
|
void GetControlToken() {
|
|
const int which = TOKEN_CONTROL;
|
|
|
|
if (tokens[which].proc == NULL) {
|
|
tokens[which].proc = g_scheduler->getCurrentProcess();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Release control of the CONTROL token.
|
|
*/
|
|
void FreeControlToken() {
|
|
// Allow anyone to free TOKEN_CONTROL
|
|
tokens[TOKEN_CONTROL].proc = NULL;
|
|
}
|
|
|
|
|
|
/**
|
|
* Gain control of a token. If the requested token is out of range, or
|
|
* is already held by the calling process, then the calling process
|
|
* will be killed off.
|
|
*
|
|
* Otherwise, the calling process will gain the token. If the token was
|
|
* held by another process, then the previous holder is killed off.
|
|
*/
|
|
void GetToken(int which) {
|
|
assert(TOKEN_LEAD <= which && which < NUMTOKENS);
|
|
|
|
if (tokens[which].proc != NULL) {
|
|
assert(tokens[which].proc != g_scheduler->getCurrentProcess());
|
|
TerminateProcess(tokens[which].proc);
|
|
}
|
|
|
|
tokens[which].proc = g_scheduler->getCurrentProcess();
|
|
}
|
|
|
|
/**
|
|
* Release control of a token. If the requested token is not owned by
|
|
* the calling process, then the calling process will be killed off.
|
|
*/
|
|
void FreeToken(int which) {
|
|
assert(TOKEN_LEAD <= which && which < NUMTOKENS);
|
|
|
|
assert(tokens[which].proc == g_scheduler->getCurrentProcess()); // we'd have been killed if some other proc had taken this token
|
|
|
|
tokens[which].proc = NULL;
|
|
}
|
|
|
|
/**
|
|
* If it's a valid token and it's free, returns true.
|
|
*/
|
|
bool TestToken(int which) {
|
|
if (which < 0 || which >= NUMTOKENS)
|
|
return false;
|
|
|
|
return (tokens[which].proc == NULL);
|
|
}
|
|
|
|
/**
|
|
* Call at the start of each scene.
|
|
*/
|
|
void FreeAllTokens() {
|
|
for (int i = 0; i < NUMTOKENS; i++) {
|
|
tokens[i].proc = NULL;
|
|
}
|
|
}
|
|
|
|
} // End of namespace Tinsel
|