spinlock-r0drv-freebsd.c revision 07ce17b51374f83a935f97f1041f38b174d8aa47
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Spinlocks, 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 * Wrapper for the struct mtx type.
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync /** Spinlock magic value (RTSPINLOCK_MAGIC). */
3619a23ecce9ab8cdbf52dc55d9c7ff6e8ad7ccavboxsync /** The spinlock. */
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync /** Saved interrupt flag. */
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync /** The spinlock creation flags. */
3619a23ecce9ab8cdbf52dc55d9c7ff6e8ad7ccavboxsync /** The idAssertCpu variable before acquring the lock for asserting after
3619a23ecce9ab8cdbf52dc55d9c7ff6e8ad7ccavboxsync * releasing the spinlock. */
3619a23ecce9ab8cdbf52dc55d9c7ff6e8ad7ccavboxsync /** The CPU that owns the lock. */
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsyncRTDECL(int) RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * Allocate.
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
fb27046b613e2b74e6e39910bd69bf35bd344652vboxsync PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)RTMemAllocZ(sizeof(*pThis));
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * Initialize & return.
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * Validate input.
fb27046b613e2b74e6e39910bd69bf35bd344652vboxsync PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
fb27046b613e2b74e6e39910bd69bf35bd344652vboxsync AssertMsgReturn(pThis->u32Magic == RTSPINLOCK_MAGIC,
fb27046b613e2b74e6e39910bd69bf35bd344652vboxsync ("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic),
1f1986470af9f0bb750dd859b142dc2e952deb20vboxsync * Make the lock invalid and release the memory.
fb27046b613e2b74e6e39910bd69bf35bd344652vboxsync PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync int c = 50;
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync if (--c <= 0)
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync /* Enable interrupts while we sleep. */
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync int c = 50;
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync if (--c <= 0)
fb27046b613e2b74e6e39910bd69bf35bd344652vboxsync PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync AssertMsgFailed(("Spinlock %p was not locked!\n", pThis));
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync AssertMsgFailed(("Spinlock %p was not locked!\n", pThis));
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsyncRTDECL(void) RTSpinlockReleaseNoInts(RTSPINLOCK Spinlock)
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync if (RT_UNLIKELY(!(Spinlock->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)))
f0ed7ab5e7f8d2f73b5aa08e46eb3a04cbb31cb2vboxsync RTAssertMsg2("RTSpinlockReleaseNoInts: %p (magic=%#x)\n", Spinlock, Spinlock->u32Magic);