| 0,0 → 1,117 |
|---|
| /* |
| * Copyright (c) 2009 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - 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. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * 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. |
| */ |
| |
| /** @addtogroup libc |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <fibril_sync.h> |
| #include <fibril.h> |
| #include <async.h> |
| #include <adt/list.h> |
| #include <futex.h> |
| #include <assert.h> |
| |
| void fibril_mutex_initialize(fibril_mutex_t *fm) |
| { |
| fm->counter = 1; |
| list_initialize(&fm->waiters); |
| } |
| |
| void fibril_mutex_lock(fibril_mutex_t *fm) |
| { |
| futex_down(&async_futex); |
| if (fm->counter-- <= 0) { |
| fibril_t *f = (fibril_t *) fibril_get_id(); |
| list_append(&f->link, &fm->waiters); |
| fibril_switch(FIBRIL_TO_MANAGER); |
| } else { |
| futex_up(&async_futex); |
| } |
| } |
| |
| bool fibril_mutex_trylock(fibril_mutex_t *fm) |
| { |
| bool locked = false; |
| |
| futex_down(&async_futex); |
| if (fm->counter > 0) { |
| fm->counter--; |
| locked = true; |
| } |
| futex_up(&async_futex); |
| |
| return locked; |
| } |
| |
| void fibril_mutex_unlock(fibril_mutex_t *fm) |
| { |
| futex_down(&async_futex); |
| assert(fm->counter <= 0); |
| if (fm->counter++ < 0) { |
| link_t *tmp; |
| fibril_t *f; |
| |
| assert(!list_empty(&fm->waiters)); |
| tmp = fm->waiters.next; |
| f = list_get_instance(tmp, fibril_t, link); |
| list_remove(&f->link); |
| fibril_add_ready((fid_t) f); |
| } |
| futex_up(&async_futex); |
| } |
| |
| void fibril_rwlock_initialize(fibril_rwlock_t *frw) |
| { |
| fibril_mutex_initialize(&frw->fm); |
| } |
| |
| void fibril_rwlock_read_lock(fibril_rwlock_t *frw) |
| { |
| fibril_mutex_lock(&frw->fm); |
| } |
| |
| void fibril_rwlock_write_lock(fibril_rwlock_t *frw) |
| { |
| fibril_mutex_lock(&frw->fm); |
| } |
| |
| void fibril_rwlock_read_unlock(fibril_rwlock_t *frw) |
| { |
| fibril_mutex_unlock(&frw->fm); |
| } |
| |
| void fibril_rwlock_write_unlock(fibril_rwlock_t *frw) |
| { |
| fibril_mutex_unlock(&frw->fm); |
| } |
| |
| /** @} |
| */ |