1 files changed, 342 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_umtx.c b/lib/libthr/thread/thr_umtx.c
new file mode 100644
index 0000000..a61dab0
--- /dev/null
+++ b/lib/libthr/thread/thr_umtx.c
@@ -0,0 +1,342 @@
+/*
+ * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+
+#include "thr_private.h"
+#include "thr_umtx.h"
+
+#ifndef HAS__UMTX_OP_ERR
+int _umtx_op_err(void *obj, int op, u_long val, void *uaddr, void *uaddr2)
+{
+	if (_umtx_op(obj, op, val, uaddr, uaddr2) == -1)
+		return (errno);
+	return (0);
+}
+#endif
+
+void
+_thr_umutex_init(struct umutex *mtx)
+{
+	static struct umutex default_mtx = DEFAULT_UMUTEX;
+
+	*mtx = default_mtx;
+}
+
+void
+_thr_urwlock_init(struct urwlock *rwl)
+{
+	static struct urwlock default_rwl = DEFAULT_URWLOCK;
+	*rwl = default_rwl;
+}
+
+int
+__thr_umutex_lock(struct umutex *mtx, uint32_t id)
+{
+	uint32_t owner;
+
+	if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) {
+		for (;;) {
+			/* wait in kernel */
+			_umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, 0);
+
+			owner = mtx->m_owner;
+			if ((owner & ~UMUTEX_CONTESTED) == 0 &&
+			     atomic_cmpset_acq_32(&mtx->m_owner, owner, id|owner))
+				return (0);
+		}
+	}
+
+	return	_umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0);
+}
+
+#define SPINLOOPS 1000
+
+int
+__thr_umutex_lock_spin(struct umutex *mtx, uint32_t id)
+{
+	uint32_t owner;
+
+	if (!_thr_is_smp)
+		return __thr_umutex_lock(mtx, id);
+
+	if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) {
+		for (;;) {
+			int count = SPINLOOPS;
+			while (count--) {
+				owner = mtx->m_owner;
+				if ((owner & ~UMUTEX_CONTESTED) == 0) {
+					if (atomic_cmpset_acq_32(
+					    &mtx->m_owner,
+					    owner, id|owner)) {
+						return (0);
+					}
+				}
+				CPU_SPINWAIT;
+			}
+
+			/* wait in kernel */
+			_umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, 0);
+		}
+	}
+
+	return	_umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0);
+}
+
+int
+__thr_umutex_timedlock(struct umutex *mtx, uint32_t id,
+	const struct timespec *abstime)
+{
+	struct _umtx_time *tm_p, timeout;
+	size_t tm_size;
+	uint32_t owner;
+	int ret;
+
+	if (abstime == NULL) {
+		tm_p = NULL;
+		tm_size = 0;
+	} else {
+		timeout._clockid = CLOCK_REALTIME;
+		timeout._flags = UMTX_ABSTIME;
+		timeout._timeout = *abstime;
+		tm_p = &timeout;
+		tm_size = sizeof(timeout);
+	}
+
+	for (;;) {
+		if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) {
+
+			/* wait in kernel */
+			ret = _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0,
+				 (void *)tm_size, __DECONST(void *, tm_p));
+
+			/* now try to lock it */
+			owner = mtx->m_owner;
+			if ((owner & ~UMUTEX_CONTESTED) == 0 &&
+			     atomic_cmpset_acq_32(&mtx->m_owner, owner, id|owner))
+				return (0);
+		} else {
+			ret = _umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 
+				 (void *)tm_size, __DECONST(void *, tm_p));
+			if (ret == 0)
+				break;
+		}
+		if (ret == ETIMEDOUT)
+			break;
+	}
+	return (ret);
+}
+
+int
+__thr_umutex_unlock(struct umutex *mtx, uint32_t id)
+{
+	return _umtx_op_err(mtx, UMTX_OP_MUTEX_UNLOCK, 0, 0, 0);
+}
+
+int
+__thr_umutex_trylock(struct umutex *mtx)
+{
+	return _umtx_op_err(mtx, UMTX_OP_MUTEX_TRYLOCK, 0, 0, 0);
+}
+
+int
+__thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling,
+	uint32_t *oldceiling)
+{
+	return _umtx_op_err(mtx, UMTX_OP_SET_CEILING, ceiling, oldceiling, 0);
+}
+
+int
+_thr_umtx_wait(volatile long *mtx, long id, const struct timespec *timeout)
+{
+	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
+		timeout->tv_nsec <= 0)))
+		return (ETIMEDOUT);
+	return _umtx_op_err(__DEVOLATILE(void *, mtx), UMTX_OP_WAIT, id, 0,
+		__DECONST(void*, timeout));
+}
+
+int
+_thr_umtx_wait_uint(volatile u_int *mtx, u_int id, const struct timespec *timeout, int shared)
+{
+	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
+		timeout->tv_nsec <= 0)))
+		return (ETIMEDOUT);
+	return _umtx_op_err(__DEVOLATILE(void *, mtx), 
+			shared ? UMTX_OP_WAIT_UINT : UMTX_OP_WAIT_UINT_PRIVATE, id, 0,
+			__DECONST(void*, timeout));
+}
+
+int
+_thr_umtx_timedwait_uint(volatile u_int *mtx, u_int id, int clockid,
+	const struct timespec *abstime, int shared)
+{
+	struct _umtx_time *tm_p, timeout;
+	size_t tm_size;
+
+	if (abstime == NULL) {
+		tm_p = NULL;
+		tm_size = 0;
+	} else {
+		timeout._clockid = clockid;
+		timeout._flags = UMTX_ABSTIME;
+		timeout._timeout = *abstime;
+		tm_p = &timeout;
+		tm_size = sizeof(timeout);
+	}
+
+	return _umtx_op_err(__DEVOLATILE(void *, mtx), 
+		shared ? UMTX_OP_WAIT_UINT : UMTX_OP_WAIT_UINT_PRIVATE, id, 
+		(void *)tm_size, __DECONST(void *, tm_p));
+}
+
+int
+_thr_umtx_wake(volatile void *mtx, int nr_wakeup, int shared)
+{
+	return _umtx_op_err(__DEVOLATILE(void *, mtx), shared ? UMTX_OP_WAKE : UMTX_OP_WAKE_PRIVATE,
+		nr_wakeup, 0, 0);
+}
+
+void
+_thr_ucond_init(struct ucond *cv)
+{
+	bzero(cv, sizeof(struct ucond));
+}
+
+int
+_thr_ucond_wait(struct ucond *cv, struct umutex *m,
+	const struct timespec *timeout, int flags)
+{
+	if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
+	    timeout->tv_nsec <= 0))) {
+		struct pthread *curthread = _get_curthread();
+		_thr_umutex_unlock(m, TID(curthread));
+                return (ETIMEDOUT);
+	}
+	return _umtx_op_err(cv, UMTX_OP_CV_WAIT, flags,
+		     m, __DECONST(void*, timeout));
+}
+ 
+int
+_thr_ucond_signal(struct ucond *cv)
+{
+	if (!cv->c_has_waiters)
+		return (0);
+	return _umtx_op_err(cv, UMTX_OP_CV_SIGNAL, 0, NULL, NULL);
+}
+
+int
+_thr_ucond_broadcast(struct ucond *cv)
+{
+	if (!cv->c_has_waiters)
+		return (0);
+	return _umtx_op_err(cv, UMTX_OP_CV_BROADCAST, 0, NULL, NULL);
+}
+
+int
+__thr_rwlock_rdlock(struct urwlock *rwlock, int flags,
+	const struct timespec *tsp)
+{
+	struct _umtx_time timeout, *tm_p;
+	size_t tm_size;
+
+	if (tsp == NULL) {
+		tm_p = NULL;
+		tm_size = 0;
+	} else {
+		timeout._timeout = *tsp;
+		timeout._flags = UMTX_ABSTIME;
+		timeout._clockid = CLOCK_REALTIME;
+		tm_p = &timeout;
+		tm_size = sizeof(timeout);
+	}
+	return _umtx_op_err(rwlock, UMTX_OP_RW_RDLOCK, flags, (void *)tm_size, tm_p);
+}
+
+int
+__thr_rwlock_wrlock(struct urwlock *rwlock, const struct timespec *tsp)
+{
+	struct _umtx_time timeout, *tm_p;
+	size_t tm_size;
+
+	if (tsp == NULL) {
+		tm_p = NULL;
+		tm_size = 0;
+	} else {
+		timeout._timeout = *tsp;
+		timeout._flags = UMTX_ABSTIME;
+		timeout._clockid = CLOCK_REALTIME;
+		tm_p = &timeout;
+		tm_size = sizeof(timeout);
+	}
+	return _umtx_op_err(rwlock, UMTX_OP_RW_WRLOCK, 0, (void *)tm_size, tm_p);
+}
+
+int
+__thr_rwlock_unlock(struct urwlock *rwlock)
+{
+	return _umtx_op_err(rwlock, UMTX_OP_RW_UNLOCK, 0, NULL, NULL);
+}
+
+void
+_thr_rwl_rdlock(struct urwlock *rwlock)
+{
+	int ret;
+
+	for (;;) {
+		if (_thr_rwlock_tryrdlock(rwlock, URWLOCK_PREFER_READER) == 0)
+			return;
+		ret = __thr_rwlock_rdlock(rwlock, URWLOCK_PREFER_READER, NULL);
+		if (ret == 0)
+			return;
+		if (ret != EINTR)
+			PANIC("rdlock error");
+	}
+}
+
+void
+_thr_rwl_wrlock(struct urwlock *rwlock)
+{
+	int ret;
+
+	for (;;) {
+		if (_thr_rwlock_trywrlock(rwlock) == 0)
+			return;
+		ret = __thr_rwlock_wrlock(rwlock, NULL);
+		if (ret == 0)
+			return;
+		if (ret != EINTR)
+			PANIC("wrlock error");
+	}
+}
+
+void
+_thr_rwl_unlock(struct urwlock *rwlock)
+{
+	if (_thr_rwlock_unlock(rwlock))
+		PANIC("unlock error");
+}