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