mirror of
https://github.com/ZDoom/qzdoom-gpl.git
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87 lines
2 KiB
C++
87 lines
2 KiB
C++
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/*
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lock.c - data locking code for lib
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Copyright (C) Chris Ison 2001-2011
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Copyright (C) Bret Curtis 2013-2014
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This file is part of WildMIDI.
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WildMIDI is free software: you can redistribute and/or modify the player
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under the terms of the GNU General Public License and you can redistribute
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and/or modify the library under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation, either version 3 of
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the licenses, or(at your option) any later version.
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WildMIDI is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License and
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the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU General Public License and the
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GNU Lesser General Public License along with WildMIDI. If not, see
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<http://www.gnu.org/licenses/>.
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*/
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//#include "config.h"
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#ifndef __DJGPP__
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <unistd.h>
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#endif
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#include "lock.h"
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#include "common.h"
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/*
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_WM_Lock(wmlock)
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wmlock = a pointer to a value
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returns nothing
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Attempts to set a lock on the MDI tree so that
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only 1 library command may access it at any time.
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If lock fails the process retries until successful.
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*/
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void _WM_Lock(int * wmlock) {
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LOCK_START:
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/* Check if lock is clear, if so set it */
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if (*wmlock == 0) {
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(*wmlock)++;
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/* Now that the lock is set, make sure we
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* don't have a race condition. If so,
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* decrement the lock by one and retry. */
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if (*wmlock == 1) {
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return; /* Lock cleanly set */
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}
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(*wmlock)--;
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}
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#ifdef _WIN32
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Sleep(10);
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#else
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usleep(500);
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#endif
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goto LOCK_START;
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}
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/*
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_WM_Unlock(wmlock)
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wmlock = a pointer to a value
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returns nothing
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Removes a lock previously placed on the MDI tree.
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*/
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void _WM_Unlock(int *wmlock) {
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/* We don't want a -1 lock, so just to make sure */
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if ((*wmlock) != 0) {
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(*wmlock)--;
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}
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}
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#endif /* __DJGPP__ */
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