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a09e091a JB |
1 | /* |
2 | * Copyright 2003 Red Hat Inc., Raleigh, North Carolina. | |
3 | * | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining | |
7 | * a copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation on the rights to use, copy, modify, merge, | |
10 | * publish, distribute, sublicense, and/or sell copies of the Software, | |
11 | * and to permit persons to whom the Software is furnished to do so, | |
12 | * subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial | |
16 | * portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
21 | * NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS | |
22 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
23 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
25 | * SOFTWARE. | |
26 | */ | |
27 | ||
28 | /* | |
29 | * Authors: | |
30 | * Kevin E. Martin <kem@redhat.com> | |
31 | * | |
32 | */ | |
33 | ||
34 | #ifdef HAVE_DMX_CONFIG_H | |
35 | #include <dmx-config.h> | |
36 | #endif | |
37 | ||
38 | #include "dmx.h" | |
39 | #include "dmxwindow.h" | |
40 | #include "glxserver.h" | |
41 | #include "glxswap.h" | |
42 | ||
43 | extern int __glXDoSwapBuffers(__GLXclientState * cl, XID drawId, | |
44 | GLXContextTag tag); | |
45 | ||
46 | typedef struct _SwapGroup *SwapGroupPtr; | |
47 | ||
48 | static Bool SwapBarrierIsReadyToSwap(GLuint barrier); | |
49 | static void SwapSwapBarrier(GLuint barrier); | |
50 | static void UpdateSwapBarrierList(GLuint barrier, | |
51 | SwapGroupPtr pOldSwap, SwapGroupPtr pNewSwap); | |
52 | ||
53 | /************************************************************************ | |
54 | * | |
55 | * Swap Groups | |
56 | * | |
57 | ************************************************************************/ | |
58 | ||
59 | typedef struct _SwapGroup { | |
60 | WindowPtr pWin; | |
61 | SwapGroupPtr pNext; | |
62 | ||
63 | Bool swapping; | |
64 | Bool sleeping; | |
65 | GLuint barrier; | |
66 | ||
67 | XID drawable; | |
68 | GLXContextTag tag; | |
69 | __GLXclientState *clState; | |
70 | } SwapGroupRec; | |
71 | ||
72 | static void | |
73 | SwapSwapGroup(SwapGroupPtr pSwap) | |
74 | { | |
75 | SwapGroupPtr pCur; | |
76 | ||
77 | /* All drawables in swap group are ready to swap, so just swap all | |
78 | * drawables buffers and then wake up those clients that were | |
79 | * previously sleeping */ | |
80 | ||
81 | for (pCur = pSwap; pCur; pCur = pCur->pNext) { | |
82 | if (pCur->swapping) { | |
83 | /* Swap pCur's buffers */ | |
84 | __glXDoSwapBuffers(pCur->clState, pCur->drawable, pCur->tag); | |
85 | pCur->swapping = FALSE; | |
86 | } | |
87 | ||
88 | /* Wakeup client */ | |
89 | if (pCur->sleeping) { | |
90 | ClientWakeup(pCur->clState->client); | |
91 | pCur->sleeping = FALSE; | |
92 | } | |
93 | } | |
94 | } | |
95 | ||
96 | static Bool | |
97 | SwapGroupIsReadyToSwap(SwapGroupPtr pSwap) | |
98 | { | |
99 | Bool isReady = TRUE; | |
100 | ||
101 | /* The swap group is ready to swap when all drawables are ready to | |
102 | * swap. NOTE: A drawable is also ready to swap if it is not | |
103 | * currently mapped */ | |
104 | for (; pSwap; pSwap = pSwap->pNext) { | |
105 | isReady &= (pSwap->swapping || !pSwap->pWin->mapped); | |
106 | /* FIXME: Should we use pSwap->pWin->mapped or ...->realized ??? */ | |
107 | } | |
108 | ||
109 | return isReady; | |
110 | } | |
111 | ||
112 | static Bool | |
113 | SGSwapCleanup(ClientPtr client, pointer closure) | |
114 | { | |
115 | /* SwapGroupPtr pSwap = (SwapGroupPtr)closure; */ | |
116 | ||
117 | /* This should not be called unless the client has died in which | |
118 | * case we should remove the buffer from the swap list */ | |
119 | ||
120 | return TRUE; | |
121 | } | |
122 | ||
123 | int | |
124 | SGSwapBuffers(__GLXclientState * cl, XID drawId, GLXContextTag tag, | |
125 | DrawablePtr pDraw) | |
126 | { | |
127 | WindowPtr pWin = (WindowPtr) pDraw; | |
128 | dmxWinPrivPtr pWinPriv = DMX_GET_WINDOW_PRIV(pWin); | |
129 | SwapGroupPtr pSwap = pWinPriv->swapGroup; | |
130 | SwapGroupPtr pCur; | |
131 | ||
132 | for (pCur = pSwap; pCur && pCur->pWin != pWin; pCur = pCur->pNext); | |
133 | if (!pCur) | |
134 | return BadDrawable; | |
135 | ||
136 | pCur->clState = cl; | |
137 | pCur->drawable = drawId; | |
138 | pCur->tag = tag; | |
139 | ||
140 | /* We are now in the process of swapping */ | |
141 | pCur->swapping = TRUE; | |
142 | ||
143 | if (pSwap->barrier && SwapBarrierIsReadyToSwap(pSwap->barrier)) { | |
144 | /* The swap group is bound to a barrier and the barrier is ready | |
145 | * to swap, so swap all the swap groups that are bound to this | |
146 | * group's swap barrier */ | |
147 | SwapSwapBarrier(pSwap->barrier); | |
148 | } | |
149 | else if (!pSwap->barrier && SwapGroupIsReadyToSwap(pSwap)) { | |
150 | /* Do the swap if the entire swap group is ready to swap and the | |
151 | * group is not bound to a swap barrier */ | |
152 | SwapSwapGroup(pSwap); | |
153 | } | |
154 | else { | |
155 | /* The swap group/barrier is not yet ready to swap, so put | |
156 | * client to sleep until the rest are ready to swap */ | |
157 | ClientSleep(cl->client, SGSwapCleanup, (pointer) pWin); | |
158 | pCur->sleeping = TRUE; | |
159 | } | |
160 | ||
161 | return Success; | |
162 | } | |
163 | ||
164 | static void | |
165 | SGWindowUnmapped(WindowPtr pWin) | |
166 | { | |
167 | dmxWinPrivPtr pWinPriv = DMX_GET_WINDOW_PRIV(pWin); | |
168 | SwapGroupPtr pSwap = pWinPriv->swapGroup; | |
169 | ||
170 | /* Now that one of the windows in the swap group has been unmapped, | |
171 | * see if the entire swap group/barrier is ready to swap */ | |
172 | ||
173 | if (pSwap->barrier && SwapBarrierIsReadyToSwap(pSwap->barrier)) { | |
174 | SwapSwapBarrier(pSwap->barrier); | |
175 | } | |
176 | else if (!pSwap->barrier && SwapGroupIsReadyToSwap(pSwap)) { | |
177 | SwapSwapGroup(pSwap); | |
178 | } | |
179 | } | |
180 | ||
181 | static void | |
182 | SGWindowDestroyed(WindowPtr pWin) | |
183 | { | |
184 | JoinSwapGroupSGIX((DrawablePtr) pWin, NULL); | |
185 | } | |
186 | ||
187 | static SwapGroupPtr | |
188 | CreateSwapEntry(WindowPtr pWin) | |
189 | { | |
190 | SwapGroupPtr pEntry; | |
191 | ||
192 | /* Allocate new swap group */ | |
193 | pEntry = malloc(sizeof(*pEntry)); | |
194 | if (!pEntry) | |
195 | return NULL; | |
196 | ||
197 | /* Initialize swap group */ | |
198 | pEntry->pWin = pWin; | |
199 | pEntry->pNext = NULL; | |
200 | pEntry->swapping = FALSE; | |
201 | pEntry->sleeping = FALSE; | |
202 | pEntry->barrier = 0; | |
203 | /* The following are not initialized until SwapBuffers is called: | |
204 | * pEntry->drawable | |
205 | * pEntry->tag | |
206 | * pEntry->clState | |
207 | */ | |
208 | ||
209 | return pEntry; | |
210 | } | |
211 | ||
212 | static void | |
213 | FreeSwapEntry(SwapGroupPtr pEntry) | |
214 | { | |
215 | /* Since we have removed the drawable from its previous swap group | |
216 | * and it won't be added to another swap group, the only thing that | |
217 | * we need to do is to make sure that the drawable's client is not | |
218 | * sleeping. This could happen if one thread is sleeping, while | |
219 | * another thread called glxJoinSwapGroup(). Note that all sleeping | |
220 | * threads should also be swapping, but there is a small window in | |
221 | * the SGSwapBuffer() logic, above, where swapping can be set but | |
222 | * sleeping is not. We check both independently here just to be | |
223 | * pedantic. */ | |
224 | ||
225 | /* Handle swap buffer request */ | |
226 | if (pEntry->swapping) | |
227 | __glXDoSwapBuffers(pEntry->clState, pEntry->drawable, pEntry->tag); | |
228 | ||
229 | /* Wake up client */ | |
230 | if (pEntry->sleeping) | |
231 | ClientWakeup(pEntry->clState->client); | |
232 | ||
233 | /* We can free the pEntry entry since it has already been removed | |
234 | * from the swap group list and it won't be needed any longer */ | |
235 | free(pEntry); | |
236 | } | |
237 | ||
238 | int | |
239 | JoinSwapGroupSGIX(DrawablePtr pDraw, DrawablePtr pMember) | |
240 | { | |
241 | if (pDraw->type == DRAWABLE_WINDOW) { | |
242 | WindowPtr pWin = (WindowPtr) pDraw; | |
243 | dmxWinPrivPtr pWinPriv = DMX_GET_WINDOW_PRIV(pWin); | |
244 | SwapGroupPtr pOldSwap = NULL; | |
245 | SwapGroupPtr pEntry; | |
246 | ||
247 | /* If pDraw and pMember are already members of the same swap | |
248 | * group, just return Success since there is nothing to do */ | |
249 | for (pEntry = pWinPriv->swapGroup; pEntry; pEntry = pEntry->pNext) | |
250 | if (pEntry->pWin == (WindowPtr) pMember) | |
251 | return Success; | |
252 | ||
253 | /* Remove pDraw from its current swap group */ | |
254 | if (pWinPriv->swapGroup) { | |
255 | SwapGroupPtr pSwapGroup = pWinPriv->swapGroup; | |
256 | SwapGroupPtr pPrev; | |
257 | ||
258 | /* Find old swap entry in swap group and save in pOldSwap | |
259 | * for later use */ | |
260 | for (pOldSwap = pWinPriv->swapGroup, pPrev = NULL; | |
261 | pOldSwap && pOldSwap->pWin != pWin; | |
262 | pPrev = pOldSwap, pOldSwap = pOldSwap->pNext); | |
263 | if (!pOldSwap) | |
264 | return BadDrawable; | |
265 | ||
266 | /* Remove pDraw's swap group entry from swap group list */ | |
267 | if (pPrev) { | |
268 | pPrev->pNext = pOldSwap->pNext; | |
269 | } | |
270 | else { | |
271 | /* pWin is at the head of the swap group list, so we | |
272 | * need to update all other members of this swap | |
273 | * group */ | |
274 | for (pEntry = pOldSwap->pNext; pEntry; pEntry = pEntry->pNext) | |
275 | DMX_GET_WINDOW_PRIV(pEntry->pWin)->swapGroup | |
276 | = pOldSwap->pNext; | |
277 | ||
278 | /* Update the barrier list as well */ | |
279 | if (pOldSwap->barrier) | |
280 | UpdateSwapBarrierList(pOldSwap->barrier, | |
281 | pOldSwap, pOldSwap->pNext); | |
282 | ||
283 | /* Set pSwapGroup to point to the swap group without | |
284 | * pOldSwap */ | |
285 | pSwapGroup = pOldSwap->pNext; | |
286 | } | |
287 | ||
288 | /* Check to see if current swap group can now swap since we | |
289 | * know at this point that pDraw and pMember are guaranteed | |
290 | * to previously be in different swap groups */ | |
291 | if (pSwapGroup && SwapGroupIsReadyToSwap(pSwapGroup)) { | |
292 | SwapSwapGroup(pSwapGroup); | |
293 | } | |
294 | ||
295 | /* Make the old swap entry a standalone group */ | |
296 | pOldSwap->pNext = NULL; | |
297 | pOldSwap->barrier = 0; | |
298 | ||
299 | /* Reset pWin's swap group */ | |
300 | pWinPriv->swapGroup = NULL; | |
301 | pWinPriv->windowDestroyed = NULL; | |
302 | pWinPriv->windowUnmapped = NULL; | |
303 | } | |
304 | ||
305 | if (!pMember || pMember->type != DRAWABLE_WINDOW) { | |
306 | /* Free old swap group since it is no longer needed */ | |
307 | if (pOldSwap) | |
308 | FreeSwapEntry(pOldSwap); | |
309 | } | |
310 | else if (pDraw == pMember && pOldSwap) { | |
311 | /* Special case where pDraw was previously created and we | |
312 | * are now just putting it to its own swap group */ | |
313 | pWinPriv->swapGroup = pOldSwap; | |
314 | pWinPriv->windowDestroyed = SGWindowDestroyed; | |
315 | pWinPriv->windowUnmapped = SGWindowUnmapped; | |
316 | ||
317 | /* Check to see if pDraw is ready to swap */ | |
318 | if (SwapGroupIsReadyToSwap(pOldSwap)) | |
319 | SwapSwapGroup(pOldSwap); | |
320 | } | |
321 | else if (pMember->type == DRAWABLE_WINDOW) { | |
322 | WindowPtr pMemberWin = (WindowPtr) pMember; | |
323 | dmxWinPrivPtr pMemberPriv = DMX_GET_WINDOW_PRIV(pMemberWin); | |
324 | SwapGroupPtr pMemberSwapGroup = pMemberPriv->swapGroup; | |
325 | ||
326 | /* Finally, how we can add pDraw to pMember's swap group */ | |
327 | ||
328 | /* If pMember is not currently in a swap group, then create | |
329 | * one for it since we are just about to add pDraw to it. */ | |
330 | if (!pMemberSwapGroup) { | |
331 | /* Create new swap group */ | |
332 | pMemberSwapGroup = CreateSwapEntry(pMemberWin); | |
333 | if (!pMemberSwapGroup) { | |
334 | if (pOldSwap) | |
335 | FreeSwapEntry(pOldSwap); | |
336 | return BadAlloc; | |
337 | } | |
338 | ||
339 | /* Set pMember's swap group */ | |
340 | pMemberPriv->swapGroup = pMemberSwapGroup; | |
341 | pMemberPriv->windowDestroyed = SGWindowDestroyed; | |
342 | pMemberPriv->windowUnmapped = SGWindowUnmapped; | |
343 | } | |
344 | ||
345 | /* If pDraw == pMember, that means pDraw was not a member of | |
346 | * a group previously (or it would have been handled by the | |
347 | * special case above), so no additional work is required | |
348 | * since we just created a new swap group for pMember (i.e., | |
349 | * pDraw). */ | |
350 | ||
351 | if (pDraw != pMember) { | |
352 | /* If pDraw was not previously in a swap group, then create | |
353 | * an entry for it */ | |
354 | if (!pOldSwap) { | |
355 | /* Create new swap group */ | |
356 | pOldSwap = CreateSwapEntry(pWin); | |
357 | if (!pOldSwap) { | |
358 | /* If we just created a swap group for pMember, we | |
359 | * need to free it here */ | |
360 | if (pMemberSwapGroup->pNext == NULL) { | |
361 | FreeSwapEntry(pMemberSwapGroup); | |
362 | pMemberPriv->swapGroup = NULL; | |
363 | } | |
364 | return BadAlloc; | |
365 | } | |
366 | } | |
367 | ||
368 | /* Find last entry in pMember's swap group */ | |
369 | for (pEntry = pMemberSwapGroup; | |
370 | pEntry->pNext; pEntry = pEntry->pNext); | |
371 | ||
372 | /* Add pDraw's swap group entry to pMember's swap group list */ | |
373 | pEntry->pNext = pOldSwap; | |
374 | ||
375 | /* Add pDraw to pMember's swap barrier */ | |
376 | pOldSwap->barrier = pEntry->barrier; | |
377 | ||
378 | /* Set pDraw's swap group */ | |
379 | pWinPriv->swapGroup = pMemberSwapGroup; | |
380 | pWinPriv->windowDestroyed = SGWindowDestroyed; | |
381 | pWinPriv->windowUnmapped = SGWindowUnmapped; | |
382 | } | |
383 | } | |
384 | } | |
385 | ||
386 | return Success; | |
387 | } | |
388 | ||
389 | /************************************************************************ | |
390 | * | |
391 | * Swap Barriers | |
392 | * | |
393 | ************************************************************************/ | |
394 | ||
395 | #define GLX_MAX_SWAP_BARRIERS 10 | |
396 | ||
397 | typedef struct _SwapBarrier *SwapBarrierPtr; | |
398 | typedef struct _SwapBarrier { | |
399 | SwapGroupPtr pSwap; | |
400 | SwapBarrierPtr pNext; | |
401 | } SwapBarrierRec; | |
402 | ||
403 | static SwapBarrierPtr SwapBarrierList[GLX_MAX_SWAP_BARRIERS + 1]; | |
404 | ||
405 | void | |
406 | SwapBarrierInit(void) | |
407 | { | |
408 | int i; | |
409 | ||
410 | for (i = 0; i <= GLX_MAX_SWAP_BARRIERS; i++) | |
411 | SwapBarrierList[i] = NULL; | |
412 | } | |
413 | ||
414 | void | |
415 | SwapBarrierReset(void) | |
416 | { | |
417 | int i; | |
418 | ||
419 | for (i = 0; i <= GLX_MAX_SWAP_BARRIERS; i++) { | |
420 | SwapBarrierPtr pBarrier, pNextBarrier; | |
421 | ||
422 | for (pBarrier = SwapBarrierList[i]; pBarrier; pBarrier = pNextBarrier) { | |
423 | pNextBarrier = pBarrier->pNext; | |
424 | free(pBarrier); | |
425 | } | |
426 | SwapBarrierList[i] = NULL; | |
427 | } | |
428 | } | |
429 | ||
430 | int | |
431 | QueryMaxSwapBarriersSGIX(int screen) | |
432 | { | |
433 | return GLX_MAX_SWAP_BARRIERS; | |
434 | } | |
435 | ||
436 | static Bool | |
437 | BindSwapGroupToBarrier(GLuint barrier, SwapGroupPtr pSwapGroup) | |
438 | { | |
439 | SwapBarrierPtr pBarrier; | |
440 | ||
441 | pBarrier = malloc(sizeof(*pBarrier)); | |
442 | if (!pBarrier) | |
443 | return FALSE; | |
444 | ||
445 | /* Add the swap group to barrier's list */ | |
446 | pBarrier->pSwap = pSwapGroup; | |
447 | pBarrier->pNext = SwapBarrierList[barrier]; | |
448 | SwapBarrierList[barrier] = pBarrier; | |
449 | ||
450 | return TRUE; | |
451 | } | |
452 | ||
453 | static Bool | |
454 | UnbindSwapGroupFromBarrier(GLuint barrier, SwapGroupPtr pSwapGroup) | |
455 | { | |
456 | SwapBarrierPtr pBarrier, pPrevBarrier; | |
457 | ||
458 | /* Find the swap group in barrier's list */ | |
459 | for (pBarrier = SwapBarrierList[barrier], pPrevBarrier = NULL; | |
460 | pBarrier && pBarrier->pSwap != pSwapGroup; | |
461 | pPrevBarrier = pBarrier, pBarrier = pBarrier->pNext); | |
462 | if (!pBarrier) | |
463 | return FALSE; | |
464 | ||
465 | /* Remove the swap group from barrier's list */ | |
466 | if (pPrevBarrier) | |
467 | pPrevBarrier->pNext = pBarrier->pNext; | |
468 | else | |
469 | SwapBarrierList[barrier] = pBarrier->pNext; | |
470 | ||
471 | /* Free memory */ | |
472 | free(pBarrier); | |
473 | ||
474 | return TRUE; | |
475 | } | |
476 | ||
477 | static void | |
478 | UpdateSwapBarrierList(GLuint barrier, | |
479 | SwapGroupPtr pOldSwap, SwapGroupPtr pNewSwap) | |
480 | { | |
481 | SwapBarrierPtr pBarrier; | |
482 | ||
483 | /* If the old swap group is being destroyed, then we need to remove | |
484 | * the swap group from the list entirely */ | |
485 | if (!pNewSwap) { | |
486 | UnbindSwapGroupFromBarrier(barrier, pOldSwap); | |
487 | return; | |
488 | } | |
489 | ||
490 | /* Otherwise, find the old swap group in the barrier list and change | |
491 | * it to the new swap group */ | |
492 | for (pBarrier = SwapBarrierList[barrier]; | |
493 | pBarrier; pBarrier = pBarrier->pNext) { | |
494 | if (pBarrier->pSwap == pOldSwap) { | |
495 | pBarrier->pSwap = pNewSwap; | |
496 | return; | |
497 | } | |
498 | } | |
499 | } | |
500 | ||
501 | static Bool | |
502 | SwapBarrierIsReadyToSwap(GLuint barrier) | |
503 | { | |
504 | SwapBarrierPtr pBarrier; | |
505 | Bool isReady = TRUE; | |
506 | ||
507 | /* The swap barier is ready to swap when swap groups that are bound | |
508 | * to barrier are ready to swap */ | |
509 | for (pBarrier = SwapBarrierList[barrier]; | |
510 | pBarrier; pBarrier = pBarrier->pNext) | |
511 | isReady &= SwapGroupIsReadyToSwap(pBarrier->pSwap); | |
512 | ||
513 | return isReady; | |
514 | } | |
515 | ||
516 | static void | |
517 | SwapSwapBarrier(GLuint barrier) | |
518 | { | |
519 | SwapBarrierPtr pBarrier; | |
520 | ||
521 | /* Swap each group that is a member of this barrier */ | |
522 | for (pBarrier = SwapBarrierList[barrier]; | |
523 | pBarrier; pBarrier = pBarrier->pNext) | |
524 | SwapSwapGroup(pBarrier->pSwap); | |
525 | } | |
526 | ||
527 | int | |
528 | BindSwapBarrierSGIX(DrawablePtr pDraw, int barrier) | |
529 | { | |
530 | /* FIXME: Check for errors when pDraw->type != DRAWABLE_WINDOW */ | |
531 | ||
532 | if (barrier < 0 || barrier > GLX_MAX_SWAP_BARRIERS) | |
533 | return BadValue; | |
534 | ||
535 | if (pDraw->type == DRAWABLE_WINDOW) { | |
536 | WindowPtr pWin = (WindowPtr) pDraw; | |
537 | dmxWinPrivPtr pWinPriv = DMX_GET_WINDOW_PRIV(pWin); | |
538 | SwapGroupPtr pSwapGroup = pWinPriv->swapGroup; | |
539 | SwapGroupPtr pCur; | |
540 | ||
541 | if (!pSwapGroup) | |
542 | return BadDrawable; | |
543 | if (barrier && pSwapGroup->barrier) | |
544 | return BadValue; | |
545 | ||
546 | /* Update the swap barrier list */ | |
547 | if (barrier) { | |
548 | if (!BindSwapGroupToBarrier(barrier, pSwapGroup)) | |
549 | return BadAlloc; | |
550 | } | |
551 | else { | |
552 | if (!UnbindSwapGroupFromBarrier(pSwapGroup->barrier, pSwapGroup)) | |
553 | return BadDrawable; | |
554 | } | |
555 | ||
556 | /* Set the barrier for each member of this swap group */ | |
557 | for (pCur = pSwapGroup; pCur; pCur = pCur->pNext) | |
558 | pCur->barrier = barrier; | |
559 | } | |
560 | ||
561 | return Success; | |
562 | } |