84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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/*
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Copyright 1993, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*/
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/*
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* Author: Stephen Gildea, MIT X Consortium
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*
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* XLockDis.c - multi-thread application-level locking routines
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "Xlibint.h"
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#ifdef XTHREADS
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#include "locking.h"
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#endif
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void
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XLockDisplay(
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register Display* dpy)
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{
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#ifdef XTHREADS
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LockDisplay(dpy);
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if (dpy->lock)
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(*dpy->lock->user_lock_display)(dpy);
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/*
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* We want the threads in the reply queue to all get out before
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* XLockDisplay returns, in case they have any side effects the
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* caller of XLockDisplay was trying to protect against.
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* XLockDisplay puts itself at the head of the event waiters queue
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* to wait for all the replies to come in.
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*/
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if (dpy->lock && dpy->lock->reply_awaiters) {
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struct _XCVList *cvl;
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cvl = (*dpy->lock->create_cvl)(dpy);
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/* stuff ourselves on the head of the queue */
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cvl->next = dpy->lock->event_awaiters;
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dpy->lock->event_awaiters = cvl;
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while (dpy->lock->reply_awaiters)
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ConditionWait(dpy, cvl->cv);
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UnlockNextEventReader(dpy); /* pass the signal on */
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}
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UnlockDisplay(dpy);
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#endif
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}
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void
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XUnlockDisplay(
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register Display* dpy)
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{
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#ifdef XTHREADS
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LockDisplay(dpy);
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if (dpy->lock)
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(*dpy->lock->user_unlock_display)(dpy);
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UnlockDisplay(dpy);
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#endif
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}
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