00001 /* 00002 * Copyright (C) 2001-2004 Jakub Jermar 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 00009 * - Redistributions of source code must retain the above copyright 00010 * notice, this list of conditions and the following disclaimer. 00011 * - Redistributions in binary form must reproduce the above copyright 00012 * notice, this list of conditions and the following disclaimer in the 00013 * documentation and/or other materials provided with the distribution. 00014 * - The name of the author may not be used to endorse or promote products 00015 * derived from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 00018 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00019 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 00020 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 00021 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 00022 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00023 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00024 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00025 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 00026 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00027 */ 00028 00038 #include <synch/condvar.h> 00039 #include <synch/mutex.h> 00040 #include <synch/waitq.h> 00041 #include <synch/synch.h> 00042 #include <arch.h> 00043 #include <typedefs.h> 00044 00049 void condvar_initialize(condvar_t *cv) 00050 { 00051 waitq_initialize(&cv->wq); 00052 } 00053 00060 void condvar_signal(condvar_t *cv) 00061 { 00062 waitq_wakeup(&cv->wq, WAKEUP_FIRST); 00063 } 00064 00071 void condvar_broadcast(condvar_t *cv) 00072 { 00073 waitq_wakeup(&cv->wq, WAKEUP_ALL); 00074 } 00075 00090 int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, __u32 usec, int flags) 00091 { 00092 int rc; 00093 ipl_t ipl; 00094 00095 ipl = waitq_sleep_prepare(&cv->wq); 00096 mutex_unlock(mtx); 00097 00098 cv->wq.missed_wakeups = 0; /* Enforce blocking. */ 00099 rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); 00100 00101 mutex_lock(mtx); 00102 waitq_sleep_finish(&cv->wq, rc, ipl); 00103 00104 return rc; 00105 } 00106