semeventmulti-r0drv-freebsd.c revision 135d4fd34eb73c299eacfa22c1a864e2aba97fef
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, FreeBSD.
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * Permission is hereby granted, free of charge, to any person
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * obtaining a copy of this software and associated documentation
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * files (the "Software"), to deal in the Software without
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * restriction, including without limitation the rights to use,
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * copy, modify, merge, publish, distribute, sublicense, and/or sell
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * copies of the Software, and to permit persons to whom the
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * Software is furnished to do so, subject to the following
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * conditions:
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * The above copyright notice and this permission notice shall be
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * included in all copies or substantial portions of the Software.
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * OTHER DEALINGS IN THE SOFTWARE.
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync/*******************************************************************************
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync* Header Files *
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync*******************************************************************************/
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync/*******************************************************************************
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync* Structures and Typedefs *
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync*******************************************************************************/
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * FreeBSD multiple release event semaphore.
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync /** Magic value (RTSEMEVENTMULTI_MAGIC). */
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync /** The number of waiting threads. */
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync /** Set if the event object is signaled. */
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync /** The number of threads in the process of waking up. */
fea595114d685c0f865a710172df95896f08d47bvboxsync /** Spinlock protecting this structure. */
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync} RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsyncRTDECL(int) RTSemEventMultiCreate(PRTSEMEVENTMULTI pEventMultiSem)
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync Assert(sizeof(RTSEMEVENTMULTIINTERNAL) > sizeof(void *));
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertPtrReturn(pEventMultiSem, VERR_INVALID_POINTER);
24b814713d57519124d491243137f551be686c66vboxsync PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)RTMemAllocZ(sizeof(*pEventMultiInt));
fea595114d685c0f865a710172df95896f08d47bvboxsync int rc = RTSpinlockCreate(&pEventMultiInt->hSpinLock);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsyncRTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI EventMultiSem)
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync if (EventMultiSem == NIL_RTSEMEVENTMULTI) /* don't bitch */
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockAcquire(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ASMAtomicIncU32(&pEventMultiInt->u32Magic); /* make the handle invalid */
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync /* abort waiting thread, last man cleans up. */
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ASMAtomicXchgU32(&pEventMultiInt->cWaking, pEventMultiInt->cWaking + pEventMultiInt->cWaiters);
fea595114d685c0f865a710172df95896f08d47bvboxsync sleepq_broadcast(pEventMultiInt, SLEEPQ_CONDVAR, 0, 0);
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync /* the last waking thread is gonna do the cleanup */
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsyncRTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI EventMultiSem)
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockAcquire(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ASMAtomicXchgU32(&pEventMultiInt->cWaking, pEventMultiInt->cWaking + pEventMultiInt->cWaiters);
fea595114d685c0f865a710172df95896f08d47bvboxsync int fWakeupSwapProc = sleepq_signal(pEventMultiInt, SLEEPQ_CONDVAR, 0, 0);
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsyncRTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI EventMultiSem)
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockAcquire(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ASMAtomicXchgU8(&pEventMultiInt->fSignaled, false);
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsyncstatic int rtSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies, bool fInterruptible)
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockAcquire(pEventMultiInt->hSpinLock, &Tmp);
fea595114d685c0f865a710172df95896f08d47bvboxsync sleepq_add(pEventMultiInt, NULL, "IPRT Event Semaphore", fFlags, 0);
fea595114d685c0f865a710172df95896f08d47bvboxsync * Translate milliseconds into ticks and go to sleep.
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockAcquire(pEventMultiInt->hSpinLock, &Tmp);
fea595114d685c0f865a710172df95896f08d47bvboxsync if (pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC)
fea595114d685c0f865a710172df95896f08d47bvboxsync rc = VERR_SEM_DESTROYED; /** @todo this isn't necessarily correct, we've
fea595114d685c0f865a710172df95896f08d47bvboxsync * could've woken up just before destruction... */
fea595114d685c0f865a710172df95896f08d47bvboxsync /* The event was destroyed, as the last thread do the cleanup.
fea595114d685c0f865a710172df95896f08d47bvboxsync we don't actually know whether */
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
fea595114d685c0f865a710172df95896f08d47bvboxsync RTSpinlockRelease(pEventMultiInt->hSpinLock, &Tmp);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsyncRTDECL(int) RTSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync return rtSemEventMultiWait(EventMultiSem, cMillies, false /* not interruptible */);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsyncRTDECL(int) RTSemEventMultiWaitNoResume(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync return rtSemEventMultiWait(EventMultiSem, cMillies, true /* interruptible */);