diff options
author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2017-11-17 10:49:59 +0100 |
---|---|---|
committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2017-11-17 10:49:59 +0100 |
commit | c360b1a2dc697e0227de54c219471e50860c0adb (patch) | |
tree | fa5895a65e2864e554f5ee1c8f9e188b64936eef /rtemsbsd/rtems | |
parent | Revert "SX(9): Implement with reader/writer lock" (diff) | |
download | rtems-libbsd-c360b1a2dc697e0227de54c219471e50860c0adb.tar.bz2 |
Revert "RWLOCK(9): Add reader/writer lock implementation"
This was accidentally committed.
This reverts commit 97a98f6cd767b3a68279890488c7b451788f84f4.
Diffstat (limited to 'rtemsbsd/rtems')
-rw-r--r-- | rtemsbsd/rtems/rtems-kernel-rwlock.c | 113 | ||||
-rw-r--r-- | rtemsbsd/rtems/rtems-kernel-rwlockimpl.c | 177 |
2 files changed, 30 insertions, 260 deletions
diff --git a/rtemsbsd/rtems/rtems-kernel-rwlock.c b/rtemsbsd/rtems/rtems-kernel-rwlock.c index c2002e0e..80918f70 100644 --- a/rtemsbsd/rtems/rtems-kernel-rwlock.c +++ b/rtemsbsd/rtems/rtems-kernel-rwlock.c @@ -15,7 +15,7 @@ * USA * <kevin.kirspel@optimedical.com> * - * Copyright (c) 2013, 2017 embedded brains GmbH. All rights reserved. + * Copyright (c) 2013-2015 embedded brains GmbH. All rights reserved. * * embedded brains GmbH * Dornierstr. 4 @@ -23,9 +23,6 @@ * Germany * <rtems@embedded-brains.de> * - * Copyright (c) 2006 John Baldwin <jhb@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: @@ -49,7 +46,7 @@ */ #include <machine/rtems-bsd-kernel-space.h> -#include <machine/rtems-bsd-rwlockimpl.h> +#include <machine/rtems-bsd-muteximpl.h> #include <sys/param.h> #include <sys/types.h> @@ -73,9 +70,9 @@ struct lock_class lock_class_rw = { .lc_unlock = unlock_rw, }; -#define rw_wowner(rw) rtems_bsd_rwlock_wowner(&(rw)->rwlock) +#define rw_wowner(rw) rtems_bsd_mutex_owner(&(rw)->mutex) -#define rw_recursed(rw) rtems_bsd_rwlock_recursed(&(rw)->rwlock) +#define rw_recursed(rw) rtems_bsd_mutex_recursed(&(rw)->mutex) void assert_rw(const struct lock_object *lock, int what) @@ -87,29 +84,16 @@ assert_rw(const struct lock_object *lock, int what) void lock_rw(struct lock_object *lock, uintptr_t how) { - struct rwlock *rw; - rw = (struct rwlock *)lock; - if (how) - rw_rlock(rw); - else - rw_wlock(rw); + rw_wlock((struct rwlock *)lock); } uintptr_t unlock_rw(struct lock_object *lock) { - struct rwlock *rw; - - rw = (struct rwlock *)lock; - rw_assert(rw, RA_LOCKED | LA_NOTRECURSED); - if (rw->rwlock.readers > 0) { - rw_runlock(rw); - return (1); - } else { - rw_wunlock(rw); - return (0); - } + + rw_unlock((struct rwlock *)lock); + return (0); } void @@ -121,7 +105,7 @@ rw_init_flags(struct rwlock *rw, const char *name, int opts) if (opts & RW_RECURSE) flags |= LO_RECURSABLE; - rtems_bsd_rwlock_init(&rw->lock_object, &rw->rwlock, &lock_class_rw, + rtems_bsd_mutex_init(&rw->lock_object, &rw->mutex, &lock_class_rw, name, NULL, flags); } @@ -129,87 +113,77 @@ void rw_destroy(struct rwlock *rw) { - rtems_bsd_rwlock_destroy(&rw->lock_object, &rw->rwlock); + rtems_bsd_mutex_destroy(&rw->lock_object, &rw->mutex); } void rw_sysinit(void *arg) { - struct rw_args *args = arg; + struct rw_args *args = arg; - rw_init((struct rwlock *)args->ra_rw, args->ra_desc); + rw_init(args->ra_rw, args->ra_desc); } void rw_sysinit_flags(void *arg) { - struct rw_args_flags *args = arg; + struct rw_args_flags *args = arg; - rw_init_flags((struct rwlock *)args->ra_rw, args->ra_desc, - args->ra_flags); + rw_init_flags(args->ra_rw, args->ra_desc, args->ra_flags); } int rw_wowned(struct rwlock *rw) { - - return (rtems_bsd_rwlock_wowned(&rw->rwlock)); + return (rtems_bsd_mutex_owned(&rw->mutex)); } void _rw_wlock(struct rwlock *rw, const char *file, int line) { - - rtems_bsd_rwlock_wlock(&rw->lock_object, &rw->rwlock); + rtems_bsd_mutex_lock(&rw->lock_object, &rw->mutex); } int _rw_try_wlock(struct rwlock *rw, const char *file, int line) { - - return (rtems_bsd_rwlock_try_wlock(&rw->lock_object, &rw->rwlock)); + return (rtems_bsd_mutex_trylock(&rw->lock_object, &rw->mutex)); } void _rw_wunlock(struct rwlock *rw, const char *file, int line) { - - rtems_bsd_rwlock_wunlock(&rw->rwlock); + rtems_bsd_mutex_unlock(&rw->mutex); } void _rw_rlock(struct rwlock *rw, const char *file, int line) { - - rtems_bsd_rwlock_rlock(&rw->lock_object, &rw->rwlock); + rtems_bsd_mutex_lock(&rw->lock_object, &rw->mutex); } int _rw_try_rlock(struct rwlock *rw, const char *file, int line) { - - return (rtems_bsd_rwlock_try_rlock(&rw->lock_object, &rw->rwlock)); + return (rtems_bsd_mutex_trylock(&rw->lock_object, &rw->mutex)); } void _rw_runlock(struct rwlock *rw, const char *file, int line) { - - rtems_bsd_rwlock_runlock(&rw->rwlock); + rtems_bsd_mutex_unlock(&rw->mutex); } int _rw_try_upgrade(struct rwlock *rw, const char *file, int line) { - - return (rtems_bsd_rwlock_try_upgrade(&rw->rwlock)); + return (1); } void _rw_downgrade(struct rwlock *rw, const char *file, int line) { - - rtems_bsd_rwlock_downgrade(&rw->rwlock); + /* Nothing to do */ } #ifdef INVARIANT_SUPPORT @@ -221,7 +195,7 @@ _rw_downgrade(struct rwlock *rw, const char *file, int line) void _rw_assert(const struct rwlock *rw, int what, const char *file, int line) { - const char *name = rtems_bsd_rwlock_name(&rw->rwlock); + const char *name = rtems_bsd_mutex_name(&rw->mutex); switch (what) { case RA_LOCKED: @@ -230,33 +204,6 @@ _rw_assert(const struct rwlock *rw, int what, const char *file, int line) case RA_RLOCKED: case RA_RLOCKED | RA_RECURSED: case RA_RLOCKED | RA_NOTRECURSED: -#ifdef WITNESS - witness_assert(&rw->lock_object, what, file, line); -#else - /* - * If some other thread has a write lock or we have one - * and are asserting a read lock, fail. Also, if no one - * has a lock at all, fail. - */ - if ((rw->rwlock.readers == 0 && rw_wowner(rw) == NULL) || - (rw->rwlock.readers == 0 && (what & RA_RLOCKED || - rw_wowner(rw) != _Thread_Get_executing()))) - panic("Lock %s not %slocked @ %s:%d\n", - name, (what & RA_RLOCKED) ? - "read " : "", file, line); - - if (rw->rwlock.readers == 0 && !(what & RA_RLOCKED)) { - if (rw_recursed(rw)) { - if (what & RA_NOTRECURSED) - panic("Lock %s recursed @ %s:%d\n", - name, file, - line); - } else if (what & RA_RECURSED) - panic("Lock %s not recursed @ %s:%d\n", - name, file, line); - } -#endif - break; case RA_WLOCKED: case RA_WLOCKED | RA_RECURSED: case RA_WLOCKED | RA_NOTRECURSED: @@ -265,11 +212,11 @@ _rw_assert(const struct rwlock *rw, int what, const char *file, int line) name, file, line); if (rw_recursed(rw)) { if (what & RA_NOTRECURSED) - panic("Lock %s recursed @ %s:%d\n", - name, file, line); + panic("Lock %s recursed @ %s:%d\n", name, file, + line); } else if (what & RA_RECURSED) - panic("Lock %s not recursed @ %s:%d\n", - name, file, line); + panic("Lock %s not recursed @ %s:%d\n", name, file, + line); break; case RA_UNLOCKED: #ifdef WITNESS @@ -280,8 +227,8 @@ _rw_assert(const struct rwlock *rw, int what, const char *file, int line) * to see if we hold a read lock or not. */ if (rw_wowner(rw) == _Thread_Get_executing()) - panic("Lock %s exclusively locked @ %s:%d\n", - name, file, line); + panic("Lock %s exclusively locked @ %s:%d\n", name, + file, line); #endif break; default: diff --git a/rtemsbsd/rtems/rtems-kernel-rwlockimpl.c b/rtemsbsd/rtems/rtems-kernel-rwlockimpl.c deleted file mode 100644 index 2434e51d..00000000 --- a/rtemsbsd/rtems/rtems-kernel-rwlockimpl.c +++ /dev/null @@ -1,177 +0,0 @@ -/** - * @file - * - * @ingroup rtems_bsd_rtems - * - * @brief TODO. - */ - -/* - * Copyright (c) 2017 embedded brains GmbH. All rights reserved. - * - * embedded brains GmbH - * Dornierstr. 4 - * 82178 Puchheim - * Germany - * <rtems@embedded-brains.de> - * - * 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <machine/rtems-bsd-kernel-space.h> -#include <machine/rtems-bsd-rwlockimpl.h> - -#include <rtems/score/schedulerimpl.h> - -void -rtems_bsd_rwlock_wlock_more(const struct lock_object *lock, - rtems_bsd_rwlock *rw, Thread_Control *executing, - rtems_bsd_rwlock_context *context) -{ - Thread_Control *wowner; - - wowner = rtems_bsd_rwlock_wowner(rw); - - if (wowner == executing) { - BSD_ASSERT(lock->lo_flags & LO_RECURSABLE); - ++rw->nest_level; - - _Thread_queue_Release(&rw->writer_queue, &context->writer); - } else { - _Thread_queue_Context_set_thread_state(&context->writer, - STATES_WAITING_FOR_RWLOCK); - _Thread_queue_Context_set_enqueue_do_nothing_extra( - &context->writer); - _Thread_queue_Context_set_deadlock_callout(&context->writer, - _Thread_queue_Deadlock_fatal); - _Thread_queue_Enqueue(&rw->writer_queue.Queue, - &_Thread_queue_Operations_priority, executing, - &context->writer); - } -} - -static Thread_Control * -rtems_bsd_rwlock_flush_reader_filter(Thread_Control *reader, - Thread_queue_Queue *queue, Thread_queue_Context *queue_context) -{ - rtems_bsd_rwlock *rw; - - rw = RTEMS_CONTAINER_OF(queue, rtems_bsd_rwlock, reader_queue.Queue); - ++rw->readers; - _Thread_Resource_count_increment(reader); - return (reader); -} - -static void -rtems_bsd_rwlock_flush_reader_post_release(Thread_queue_Queue *queue, - Thread_queue_Context *queue_context) -{ - rtems_bsd_rwlock *rw; - rtems_bsd_rwlock_context *context; - - rw = RTEMS_CONTAINER_OF(queue, rtems_bsd_rwlock, reader_queue.Queue); - context = RTEMS_CONTAINER_OF(queue_context, rtems_bsd_rwlock_context, - reader); - _Thread_queue_Release(&rw->writer_queue, &context->writer); -} - -void -rtems_bsd_rwlock_wunlock_more(rtems_bsd_rwlock *rw, Thread_Control *wowner, - rtems_bsd_rwlock_context *context) -{ - - if (!_Thread_queue_Is_empty(&rw->reader_queue.Queue)) { - BSD_ASSERT(rw->readers == 0); - rtems_bsd_rwlock_ready_waiting_readers(rw, context); - } else { - BSD_ASSERT(!_Thread_queue_Is_empty(&rw->writer_queue.Queue)); - _Thread_queue_Surrender(&rw->writer_queue.Queue, - rw->writer_queue.Queue.heads, wowner, &context->writer, - &_Thread_queue_Operations_priority); - } -} - -static void -rtems_bsd_rwlock_reader_enqueue(Thread_queue_Queue *queue, - Thread_Control *executing, Per_CPU_Control *cpu_self, - Thread_queue_Context *queue_context -) -{ - rtems_bsd_rwlock *rw; - rtems_bsd_rwlock_context *context; - - rw = RTEMS_CONTAINER_OF(queue, rtems_bsd_rwlock, reader_queue.Queue); - context = RTEMS_CONTAINER_OF(queue_context, rtems_bsd_rwlock_context, - reader); - _Thread_queue_Release(&rw->writer_queue, &context->writer); -} - -void -rtems_bsd_rwlock_rlock_more(rtems_bsd_rwlock *rw, - rtems_bsd_rwlock_context *context) -{ - Thread_Control *executing; - - executing = _Thread_Executing; - - _Thread_queue_Context_initialize(&context->reader); - _Thread_queue_Context_set_thread_state(&context->reader, - STATES_WAITING_FOR_RWLOCK); - _Thread_queue_Context_set_enqueue_callout( - &context->reader, rtems_bsd_rwlock_reader_enqueue); - _Thread_queue_Context_set_deadlock_callout(&context->reader, - _Thread_queue_Deadlock_fatal); - _Thread_queue_Acquire(&rw->reader_queue, &context->reader); - _Thread_queue_Enqueue(&rw->reader_queue.Queue, - &_Thread_queue_Operations_FIFO, executing, &context->reader); -} - -void -rtems_bsd_rwlock_runlock_more(rtems_bsd_rwlock *rw, - rtems_bsd_rwlock_context *context) -{ - - if (!_Thread_queue_Is_empty(&rw->writer_queue.Queue)) { - BSD_ASSERT(rw->readers == 0); - - _Thread_queue_Surrender(&rw->writer_queue.Queue, - rw->writer_queue.Queue.heads, NULL, &context->writer, - &_Thread_queue_Operations_priority); - } else { - BSD_ASSERT(!_Thread_queue_Is_empty(&rw->reader_queue.Queue)); - rtems_bsd_rwlock_ready_waiting_readers(rw, context); - } -} - -void -rtems_bsd_rwlock_ready_waiting_readers(rtems_bsd_rwlock *rw, - rtems_bsd_rwlock_context *context) -{ - - _Thread_queue_Context_initialize(&context->reader); - _Thread_queue_Acquire(&rw->reader_queue, &context->reader); - _Thread_queue_Flush_critical(&rw->reader_queue.Queue, - &_Thread_queue_Operations_FIFO, - rtems_bsd_rwlock_flush_reader_filter, - rtems_bsd_rwlock_flush_reader_post_release, - &context->reader); -} |