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author | Max Horn | 2008-07-23 09:02:47 +0000 |
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committer | Max Horn | 2008-07-23 09:02:47 +0000 |
commit | c441c5261ff3e6ad114c0384ef818b942655f3a6 (patch) | |
tree | 6563ef6632ec89f7db2bbb62ad42aea680b507e6 /engines/tinsel/token.cpp | |
parent | e7c1a88dd3bf024e87ef62ff0c851b6a551ae2a5 (diff) | |
download | scummvm-rg350-c441c5261ff3e6ad114c0384ef818b942655f3a6.tar.gz scummvm-rg350-c441c5261ff3e6ad114c0384ef818b942655f3a6.tar.bz2 scummvm-rg350-c441c5261ff3e6ad114c0384ef818b942655f3a6.zip |
Added Tinsel engine to main repos (no news item for it ON PURPOSE)
svn-id: r33230
Diffstat (limited to 'engines/tinsel/token.cpp')
-rw-r--r-- | engines/tinsel/token.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/engines/tinsel/token.cpp b/engines/tinsel/token.cpp new file mode 100644 index 0000000000..e50290c3f0 --- /dev/null +++ b/engines/tinsel/token.cpp @@ -0,0 +1,129 @@ +/* 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 + ProcessKill(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 = CurrentProcess(); + } +} + +/** + * 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 != CurrentProcess()); + TerminateProcess(tokens[which].proc); + } + + tokens[which].proc = CurrentProcess(); +} + +/** + * 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 == CurrentProcess()); // 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(void) { + for (int i = 0; i < NUMTOKENS; i++) { + tokens[i].proc = NULL; + } +} + +} // end of namespace Tinsel |