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This is a minor extension to the condition variable API to allow for reasonable signal handling on Linux. The cv_wait() function by definition must wait unconditionally for cv_signal()/cv_broadcast() before waking it. This makes it impossible to woken by a signal such as SIGTERM. The cv_wait_interruptible() function was added to handle this case. It behaves identically to cv_wait() with the exception that it waits interruptibly allowing a signal to wake it up. This means you do need to be careful and check issig() after waking.
80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _SPL_CONDVAR_H
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#define _SPL_CONDVAR_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <linux/module.h>
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#include <linux/wait.h>
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#include <sys/kmem.h>
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#include <sys/mutex.h>
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/* The kcondvar_t struct is protected by mutex taken externally before
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* calling any of the wait/signal funs, and passed into the wait funs.
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*/
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#define CV_MAGIC 0x346545f4
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#define CV_POISON 0x95
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typedef struct {
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int cv_magic;
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char *cv_name;
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int cv_name_size;
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wait_queue_head_t cv_event;
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atomic_t cv_waiters;
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kmutex_t *cv_mutex;
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spinlock_t cv_lock;
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} kcondvar_t;
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typedef enum { CV_DEFAULT=0, CV_DRIVER } kcv_type_t;
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extern void __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg);
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extern void __cv_destroy(kcondvar_t *cvp);
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extern void __cv_wait(kcondvar_t *cvp, kmutex_t *mp);
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extern void __cv_wait_interruptible(kcondvar_t *cvp, kmutex_t *mp);
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extern clock_t __cv_timedwait(kcondvar_t *cvp, kmutex_t *mp, clock_t exp_time);
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extern void __cv_signal(kcondvar_t *cvp);
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extern void __cv_broadcast(kcondvar_t *cvp);
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#define cv_init(cvp, name, type, arg) \
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({ \
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if ((name) == NULL) \
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__cv_init(cvp, #cvp, type, arg); \
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else \
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__cv_init(cvp, name, type, arg); \
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})
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#define cv_destroy(cvp) __cv_destroy(cvp)
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#define cv_wait(cvp, mp) __cv_wait(cvp, mp)
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#define cv_wait_interruptible(cvp, mp) __cv_wait_interruptible(cvp, mp)
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#define cv_timedwait(cvp, mp, t) __cv_timedwait(cvp, mp, t)
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#define cv_signal(cvp) __cv_signal(cvp)
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#define cv_broadcast(cvp) __cv_broadcast(cvp)
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#endif /* _SPL_CONDVAR_H */
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