As shown by DRI3 adding the SyncCreateFenceFromFD() function, extensions may want to create a fence, then initialize it in their own way. This currently can't be done without adding a function directly to Xext/sync.c due to the fact that the RTFence resource type is private and there is no external interface to add to it.
To facilitate other X extensions creating fences and initializing them, this change exports SyncCreate() and adds the resource directly within it. Callers no longer need to call AddResource() after SyncCreate(), they only need to initialize the SyncObject. To prevent FreeFence() and FreeCounter() from segfaulting if the call to AddResource() fails before the sync object is initialized, this adds a new 'initialized' parameter to SyncObject that, when FALSE, causes FreeFence() and FreeCounter() to skip de-initialization and simply free the object. Initialization after adding the resource shouldn't otherwise be a problem due to the single-threaded nature of X. Signed-off-by: Alex Goins <[email protected]> --- Xext/sync.c | 50 ++++++++++++++++++++++++++++---------------------- Xext/syncsdk.h | 4 ++++ miext/sync/misync.c | 27 ++++++++++++++++----------- miext/sync/misyncstr.h | 1 + 4 files changed, 49 insertions(+), 33 deletions(-) diff --git a/Xext/sync.c b/Xext/sync.c index 8f22a86..1186b47 100644 --- a/Xext/sync.c +++ b/Xext/sync.c @@ -881,18 +881,21 @@ SyncChangeAlarmAttributes(ClientPtr client, SyncAlarm * pAlarm, Mask mask, return Success; } -static SyncObject * +SyncObject * SyncCreate(ClientPtr client, XID id, unsigned char type) { SyncObject *pSync; + RESTYPE resType; switch (type) { case SYNC_COUNTER: pSync = malloc(sizeof(SyncCounter)); + resType = RTCounter; break; case SYNC_FENCE: pSync = (SyncObject *) dixAllocateObjectWithPrivates(SyncFence, PRIVATE_SYNC_FENCE); + resType = RTFence; break; default: return NULL; @@ -901,6 +904,11 @@ SyncCreate(ClientPtr client, XID id, unsigned char type) if (!pSync) return NULL; + pSync->initialized = FALSE; + + if (!AddResource(id, resType, (void *) pSync)) + return NULL; + pSync->client = client; pSync->id = id; pSync->pTriglist = NULL; @@ -923,13 +931,10 @@ SyncCreateFenceFromFD(ClientPtr client, DrawablePtr pDraw, XID id, int fd, BOOL status = miSyncInitFenceFromFD(pDraw, pFence, fd, initially_triggered); if (status != Success) { - dixFreeObjectWithPrivates(pFence, PRIVATE_SYNC_FENCE); + FreeResource(pFence->sync.id, RT_NONE); return status; } - if (!AddResource(id, RTFence, (void *) pFence)) - return BadAlloc; - return Success; #else return BadImplementation; @@ -957,8 +962,7 @@ SyncCreateCounter(ClientPtr client, XSyncCounter id, int64_t initialvalue) pCounter->value = initialvalue; pCounter->pSysCounterInfo = NULL; - if (!AddResource(id, RTCounter, (void *) pCounter)) - return NULL; + pCounter->sync.initialized = TRUE; return pCounter; } @@ -1137,21 +1141,26 @@ static int FreeCounter(void *env, XID id) { SyncCounter *pCounter = (SyncCounter *) env; - SyncTriggerList *ptl, *pnext; pCounter->sync.beingDestroyed = TRUE; - /* tell all the counter's triggers that the counter has been destroyed */ - for (ptl = pCounter->sync.pTriglist; ptl; ptl = pnext) { - (*ptl->pTrigger->CounterDestroyed) (ptl->pTrigger); - pnext = ptl->next; - free(ptl); /* destroy the trigger list as we go */ - } - if (IsSystemCounter(pCounter)) { - xorg_list_del(&pCounter->pSysCounterInfo->entry); - free(pCounter->pSysCounterInfo->name); - free(pCounter->pSysCounterInfo->private); - free(pCounter->pSysCounterInfo); + + if (pCounter->sync.initialized) { + SyncTriggerList *ptl, *pnext; + + /* tell all the counter's triggers that counter has been destroyed */ + for (ptl = pCounter->sync.pTriglist; ptl; ptl = pnext) { + (*ptl->pTrigger->CounterDestroyed) (ptl->pTrigger); + pnext = ptl->next; + free(ptl); /* destroy the trigger list as we go */ + } + if (IsSystemCounter(pCounter)) { + xorg_list_del(&pCounter->pSysCounterInfo->entry); + free(pCounter->pSysCounterInfo->name); + free(pCounter->pSysCounterInfo->private); + free(pCounter->pSysCounterInfo); + } } + free(pCounter); return Success; } @@ -1889,9 +1898,6 @@ ProcSyncCreateFence(ClientPtr client) miSyncInitFence(pDraw->pScreen, pFence, stuff->initially_triggered); - if (!AddResource(stuff->fid, RTFence, (void *) pFence)) - return BadAlloc; - return Success; } diff --git a/Xext/syncsdk.h b/Xext/syncsdk.h index f1b99d0..17a6c87 100644 --- a/Xext/syncsdk.h +++ b/Xext/syncsdk.h @@ -25,10 +25,14 @@ #define _SYNCSDK_H_ #include "misync.h" +#include "misyncstr.h" extern _X_EXPORT int SyncVerifyFence(SyncFence ** ppFence, XID fid, ClientPtr client, Mask mode); +extern _X_EXPORT SyncObject* + SyncCreate(ClientPtr client, XID id, unsigned char type); + #define VERIFY_SYNC_FENCE(pFence, fid, client, mode) \ do { \ int rc; \ diff --git a/miext/sync/misync.c b/miext/sync/misync.c index 490fa0b..484b7e3 100644 --- a/miext/sync/misync.c +++ b/miext/sync/misync.c @@ -101,24 +101,29 @@ miSyncInitFence(ScreenPtr pScreen, SyncFence * pFence, Bool initially_triggered) pFence->funcs = miSyncFenceFuncs; pScreenPriv->funcs.CreateFence(pScreen, pFence, initially_triggered); + + pFence->sync.initialized = TRUE; } void miSyncDestroyFence(SyncFence * pFence) { - ScreenPtr pScreen = pFence->pScreen; - SyncScreenPrivPtr pScreenPriv = SYNC_SCREEN_PRIV(pScreen); - SyncTriggerList *ptl, *pNext; - pFence->sync.beingDestroyed = TRUE; - /* tell all the fence's triggers that the counter has been destroyed */ - for (ptl = pFence->sync.pTriglist; ptl; ptl = pNext) { - (*ptl->pTrigger->CounterDestroyed) (ptl->pTrigger); - pNext = ptl->next; - free(ptl); /* destroy the trigger list as we go */ - } - pScreenPriv->funcs.DestroyFence(pScreen, pFence); + if (pFence->sync.initialized) { + ScreenPtr pScreen = pFence->pScreen; + SyncScreenPrivPtr pScreenPriv = SYNC_SCREEN_PRIV(pScreen); + SyncTriggerList *ptl, *pNext; + + /* tell all the fence's triggers that the counter has been destroyed */ + for (ptl = pFence->sync.pTriglist; ptl; ptl = pNext) { + (*ptl->pTrigger->CounterDestroyed) (ptl->pTrigger); + pNext = ptl->next; + free(ptl); /* destroy the trigger list as we go */ + } + + pScreenPriv->funcs.DestroyFence(pScreen, pFence); + } dixFreeObjectWithPrivates(pFence, PRIVATE_SYNC_FENCE); } diff --git a/miext/sync/misyncstr.h b/miext/sync/misyncstr.h index 2eab2aa..5c558cf 100644 --- a/miext/sync/misyncstr.h +++ b/miext/sync/misyncstr.h @@ -43,6 +43,7 @@ typedef struct _SyncObject { struct _SyncTriggerList *pTriglist; /* list of triggers */ XID id; /* resource ID */ unsigned char type; /* SYNC_* */ + Bool initialized; /* FALSE if created but not initialized */ Bool beingDestroyed; /* in process of going away */ } SyncObject; -- 2.7.4 _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel
