2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * rx_kmutex.c - mutex and condition variable macros for kernel environment.
13 * Linux implementation.
16 #include <afsconfig.h>
17 #include "afs/param.h"
20 #include "rx/rx_kcommon.h"
21 #include "rx_kmutex.h"
22 #include "rx/rx_kernel.h"
24 #include "osi_compat.h"
27 afs_mutex_init(afs_kmutex_t * l)
29 mutex_init(&l->mutex);
34 afs_mutex_enter(afs_kmutex_t * l)
36 mutex_lock(&l->mutex);
38 osi_Panic("mutex_enter: 0x%lx held by %d", (unsigned long)l, l->owner);
39 l->owner = current->pid;
43 afs_mutex_tryenter(afs_kmutex_t * l)
45 if (mutex_trylock(&l->mutex) == 0)
47 l->owner = current->pid;
52 afs_mutex_exit(afs_kmutex_t * l)
54 if (l->owner != current->pid)
55 osi_Panic("mutex_exit: 0x%lx held by %d", (unsigned long)l, l->owner);
57 mutex_unlock(&l->mutex);
60 /* CV_WAIT and CV_TIMEDWAIT sleep until the specified event occurs, or, in the
61 * case of CV_TIMEDWAIT, until the specified timeout occurs.
62 * - NOTE: that on Linux, there are circumstances in which TASK_INTERRUPTIBLE
63 * can wake up, even if all signals are blocked
64 * - TODO: handle signals correctly by passing an indication back to the
65 * caller that the wait has been interrupted and the stack should be cleaned
66 * up preparatory to signal delivery
69 afs_cv_wait(afs_kcondvar_t * cv, afs_kmutex_t * l, int sigok)
71 int seq, isAFSGlocked = ISAFS_GLOCK();
73 #ifdef DECLARE_WAITQUEUE
74 DECLARE_WAITQUEUE(wait, current);
76 struct wait_queue wait = { current, NULL };
78 sigemptyset(&saved_set);
81 set_current_state(TASK_INTERRUPTIBLE);
82 add_wait_queue(&cv->waitq, &wait);
90 saved_set = current->blocked;
91 sigfillset(¤t->blocked);
92 RECALC_SIGPENDING(current);
96 while(seq == cv->seq) {
99 set_current_state(TASK_INTERRUPTIBLE);
102 remove_wait_queue(&cv->waitq, &wait);
103 set_current_state(TASK_RUNNING);
107 current->blocked = saved_set;
108 RECALC_SIGPENDING(current);
116 return (sigok && signal_pending(current)) ? EINTR : 0;
120 afs_cv_timedwait(afs_kcondvar_t * cv, afs_kmutex_t * l, int waittime)
122 int seq, isAFSGlocked = ISAFS_GLOCK();
123 long t = waittime * HZ / 1000;
124 #ifdef DECLARE_WAITQUEUE
125 DECLARE_WAITQUEUE(wait, current);
127 struct wait_queue wait = { current, NULL };
131 set_current_state(TASK_INTERRUPTIBLE);
132 add_wait_queue(&cv->waitq, &wait);
138 while(seq == cv->seq) {
139 t = schedule_timeout(t);
140 if (!t) /* timeout */
144 remove_wait_queue(&cv->waitq, &wait);
145 set_current_state(TASK_RUNNING);