cde/programs/dtudcfonted/libfal/_fallocking.h

   1 /*
   2  * CDE - Common Desktop Environment
   3  *
   4  * Copyright (c) 1993-2012, The Open Group. All rights reserved.
   5  *
   6  * These libraries and programs are free software; you can
   7  * redistribute them and/or modify them under the terms of the GNU
   8  * Lesser General Public License as published by the Free Software
   9  * Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * These libraries and programs are distributed in the hope that
  13  * they will be useful, but WITHOUT ANY WARRANTY; without even the
  14  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  15  * PURPOSE. See the GNU Lesser General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with these libraries and programs; if not, write
  20  * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
  21  * Floor, Boston, MA 02110-1301 USA
  22  */
  23 /* locking.h 1.1 - Fujitsu source for CDEnext    95/11/06 20:32:43      */
  24 /* $XConsortium: _fallocking.h /main/1 1996/04/08 15:21:32 cde-fuj $ */
  25 /*
  26
  27 Copyright (c) 1992  X Consortium
  28
  29 Permission is hereby granted, free of charge, to any person obtaining a copy
  30 of this software and associated documentation files (the "Software"), to deal
  31 in the Software without restriction, including without limitation the rights
  32 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  33 copies of the Software, and to permit persons to whom the Software is
  34 furnished to do so, subject to the following conditions:
  35
  36 The above copyright notice and this permission notice shall be included in
  37 all copies or substantial portions of the Software.
  38
  39 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  40 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  41 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  42 X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  43 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  44 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  45
  46 Except as contained in this notice, the name of the X Consortium shall not be
  47 used in advertising or otherwise to promote the sale, use or other dealings
  48 in this Software without prior written authorization from the X Consortium.
  49
  50 */
  51
  52 /*
  53  * Author: Stephen Gildea, MIT X Consortium
  54  *
  55  * locking.h - data types for C Threads locking.
  56  * Used by XlibInt.c, locking.c, LockDis.c
  57  */
  58
  59 #ifndef _X_locking_H_
  60 #define _X_locking_H_
  61
  62 #define xmalloc(s) Xmalloc(s)
  63 #define xfree(s) Xfree(s)
  64 #include <X11/Xthreads.h>
  65
  66 struct _XCVList {
  67     xcondition_t cv;
  68     xReply *buf;
  69     struct _XCVList *next;
  70 };
  71
  72 extern xthread_t (*_Xthread_self_fn)( /* in XlibInt.c */
  73 #if NeedFunctionPrototypes
  74     void
  75 #endif
  76 );
  77
  78 /* Display->lock is a pointer to one of these */
  79
  80 struct _XLockInfo {
  81         xmutex_t mutex;         /* mutex for critical sections */
  82         int reply_bytes_left;   /* nbytes of the reply still to read */
  83         Bool reply_was_read;    /* _XReadEvents read a reply for _XReply */
  84         struct _XCVList *reply_awaiters; /* list of CVs for _XReply */
  85         struct _XCVList **reply_awaiters_tail;
  86         struct _XCVList *event_awaiters; /* list of CVs for _XReadEvents */
  87         struct _XCVList **event_awaiters_tail;
  88         Bool reply_first;       /* who may read, reply queue or event queue */
  89         /* for XLockDisplay */
  90         int locking_level;      /* how many times into XLockDisplay we are */
  91         xthread_t locking_thread; /* thread that did XLockDisplay */
  92         xcondition_t cv;        /* wait if another thread has XLockDisplay */
  93         xthread_t reading_thread; /* cache */
  94         xthread_t conni_thread; /* thread in XProcessInternalConnection */
  95         xcondition_t writers;   /* wait for writable */
  96         int num_free_cvls;
  97         struct _XCVList *free_cvls;
  98         /* used only in XlibInt.c */
  99         void (*pop_reader)(
 100 #if NeedNestedPrototypes
 101                            Display* /* dpy */,
 102                            struct _XCVList** /* list */,
 103                            struct _XCVList*** /* tail */
 104 #endif
 105                            );
 106         struct _XCVList *(*push_reader)(
 107 #if NeedNestedPrototypes
 108                                         Display *          /* dpy */,
 109                                         struct _XCVList*** /* tail */
 110 #endif
 111                                         );
 112         void (*condition_wait)(
 113 #if NeedNestedPrototypes
 114                                xcondition_t /* cv */,
 115                                xmutex_t /* mutex */
 116 #if defined(XTHREADS_WARN) || defined(XTHREADS_FILE_LINE)
 117                                , char* /* file */,
 118                                int /* line */
 119 #endif
 120 #endif
 121                                );
 122         void (*internal_lock_display)(
 123 #if NeedNestedPrototypes
 124                                       Display* /* dpy */,
 125                                       Bool /* wskip */
 126 #if defined(XTHREADS_WARN) || defined(XTHREADS_FILE_LINE)
 127                                       , char* /* file */,
 128                                       int /* line */
 129 #endif
 130 #endif
 131                                       );
 132         /* used in XlibInt.c and locking.c */
 133         void (*condition_signal)(
 134 #if NeedNestedPrototypes
 135                                  xcondition_t /* cv */
 136 #if defined(XTHREADS_WARN) || defined(XTHREADS_FILE_LINE)
 137                                  , char* /* file */,
 138                                  int /* line */
 139 #endif
 140 #endif
 141                                  );
 142         void (*condition_broadcast)(
 143 #if NeedNestedPrototypes
 144                                  xcondition_t /* cv */
 145 #if defined(XTHREADS_WARN) || defined(XTHREADS_FILE_LINE)
 146                                  , char* /* file */,
 147                                  int /* line */
 148 #endif
 149 #endif
 150                                     );
 151         /* used in XlibInt.c and XLockDis.c */
 152         void (*lock_wait)(
 153 #if NeedNestedPrototypes
 154                           Display* /* dpy */
 155 #endif
 156                           );
 157         void (*user_lock_display)(
 158 #if NeedNestedPrototypes
 159                                   Display* /* dpy */
 160 #endif
 161                                   );
 162         void (*user_unlock_display)(
 163 #if NeedNestedPrototypes
 164                                     Display* /* dpy */
 165 #endif
 166                                     );
 167         struct _XCVList *(*create_cvl)(
 168 #if NeedNestedPrototypes
 169                                        Display * /* dpy */
 170 #endif
 171                                        );
 172 };
 173
 174 #define UnlockNextEventReader(d) if ((d)->lock) \
 175     (*(d)->lock->pop_reader)((d),&(d)->lock->event_awaiters,&(d)->lock->event_awaiters_tail)
 176
 177 #if defined(XTHREADS_WARN) || defined(XTHREADS_FILE_LINE)
 178 #define ConditionWait(d,c) if ((d)->lock) \
 179         (*(d)->lock->condition_wait)(c, (d)->lock->mutex,__FILE__,__LINE__)
 180 #define ConditionSignal(d,c) if ((d)->lock) \
 181         (*(d)->lock->condition_signal)(c,__FILE__,__LINE__)
 182 #define ConditionBroadcast(d,c) if ((d)->lock) \
 183         (*(d)->lock->condition_broadcast)(c,__FILE__,__LINE__)
 184 #else
 185 #define ConditionWait(d,c) if ((d)->lock) \
 186         (*(d)->lock->condition_wait)(c, (d)->lock->mutex)
 187 #define ConditionSignal(d,c) if ((d)->lock) \
 188         (*(d)->lock->condition_signal)(c)
 189 #define ConditionBroadcast(d,c) if ((d)->lock) \
 190         (*(d)->lock->condition_broadcast)(c)
 191 #endif
 192
 193 typedef struct _LockInfoRec {
 194         xmutex_t        lock;
 195 } LockInfoRec;
 196
 197 #endif /* _X_locking_H_ */