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Diffstat (limited to 'lib/libthr/thread/thr_umtx.c')
-rw-r--r--lib/libthr/thread/thr_umtx.c376
1 files changed, 376 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_umtx.c b/lib/libthr/thread/thr_umtx.c
new file mode 100644
index 0000000000000..86e5a1f137802
--- /dev/null
+++ b/lib/libthr/thread/thr_umtx.c
@@ -0,0 +1,376 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#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 const struct umutex default_mtx = DEFAULT_UMUTEX;
+
+ *mtx = default_mtx;
+}
+
+void
+_thr_urwlock_init(struct urwlock *rwl)
+{
+ static const 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)
+ return (_umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0));
+
+ for (;;) {
+ owner = mtx->m_owner;
+ if ((owner & ~UMUTEX_CONTESTED) == 0 &&
+ atomic_cmpset_acq_32(&mtx->m_owner, owner, id | owner))
+ return (0);
+ if (owner == UMUTEX_RB_OWNERDEAD &&
+ atomic_cmpset_acq_32(&mtx->m_owner, owner,
+ id | UMUTEX_CONTESTED))
+ return (EOWNERDEAD);
+ if (owner == UMUTEX_RB_NOTRECOV)
+ return (ENOTRECOVERABLE);
+
+ /* wait in kernel */
+ _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, 0);
+ }
+}
+
+#define SPINLOOPS 1000
+
+int
+__thr_umutex_lock_spin(struct umutex *mtx, uint32_t id)
+{
+ uint32_t owner;
+ int count;
+
+ if (!_thr_is_smp)
+ return (__thr_umutex_lock(mtx, id));
+ if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) != 0)
+ return (_umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0));
+
+ for (;;) {
+ count = SPINLOOPS;
+ while (count--) {
+ owner = mtx->m_owner;
+ if ((owner & ~UMUTEX_CONTESTED) == 0 &&
+ atomic_cmpset_acq_32(&mtx->m_owner, owner,
+ id | owner))
+ return (0);
+ if (__predict_false(owner == UMUTEX_RB_OWNERDEAD) &&
+ atomic_cmpset_acq_32(&mtx->m_owner, owner,
+ id | UMUTEX_CONTESTED))
+ return (EOWNERDEAD);
+ if (__predict_false(owner == UMUTEX_RB_NOTRECOV))
+ return (ENOTRECOVERABLE);
+ CPU_SPINWAIT;
+ }
+
+ /* wait in kernel */
+ _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 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) {
+ /* 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);
+ if (__predict_false(owner == UMUTEX_RB_OWNERDEAD) &&
+ atomic_cmpset_acq_32(&mtx->m_owner, owner,
+ id | UMUTEX_CONTESTED))
+ return (EOWNERDEAD);
+ if (__predict_false(owner == UMUTEX_RB_NOTRECOV))
+ return (ENOTRECOVERABLE);
+ /* wait in kernel */
+ ret = _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0,
+ (void *)tm_size, __DECONST(void *, tm_p));
+ } else {
+ ret = _umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0,
+ (void *)tm_size, __DECONST(void *, tm_p));
+ if (ret == 0 || ret == EOWNERDEAD ||
+ ret == ENOTRECOVERABLE)
+ break;
+ }
+ if (ret == ETIMEDOUT)
+ break;
+ }
+ return (ret);
+}
+
+int
+__thr_umutex_unlock(struct umutex *mtx)
+{
+
+ 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)
+{
+ struct pthread *curthread;
+
+ if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 &&
+ timeout->tv_nsec <= 0))) {
+ 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");
+}
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