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/* $OpenBSD: rf_threadstuff.h,v 1.3 1999/07/30 14:45:33 peter Exp $ */
/* $NetBSD: rf_threadstuff.h,v 1.5 1999/07/06 21:51:22 thorpej Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Mark Holland, Daniel Stodolsky, Jim Zelenka
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* threadstuff.h -- definitions for threads, locks, and synchronization
*
* The purpose of this file is provide some illusion of portability.
* If the functions below can be implemented with the same semantics on
* some new system, then at least the synchronization and thread control
* part of the code should not require modification to port to a new machine.
* the only other place where the pthread package is explicitly used is
* threadid.h
*
* this file should be included above stdio.h to get some necessary defines.
*
*/
#ifndef _RF__RF_THREADSTUFF_H_
#define _RF__RF_THREADSTUFF_H_
#include "rf_types.h"
#include <sys/types.h>
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#endif
#define rf_create_managed_mutex(a,b) _rf_create_managed_mutex(a,b,__FILE__,__LINE__)
#define rf_create_managed_cond(a,b) _rf_create_managed_cond(a,b,__FILE__,__LINE__)
#define rf_init_managed_threadgroup(a,b) _rf_init_managed_threadgroup(a,b,__FILE__,__LINE__)
#define rf_init_threadgroup(a) _rf_init_threadgroup(a,__FILE__,__LINE__)
#define rf_destroy_threadgroup(a) _rf_destroy_threadgroup(a,__FILE__,__LINE__)
int _rf_init_threadgroup(RF_ThreadGroup_t * g, char *file, int line);
int _rf_destroy_threadgroup(RF_ThreadGroup_t * g, char *file, int line);
int
_rf_init_managed_threadgroup(RF_ShutdownList_t ** listp,
RF_ThreadGroup_t * g, char *file, int line);
#include <sys/lock.h>
#define decl_simple_lock_data(a,b) a struct simplelock b;
#define simple_lock_addr(a) ((struct simplelock *)&(a))
typedef struct proc *RF_Thread_t;
typedef void *RF_ThreadArg_t;
#define RF_DECLARE_MUTEX(_m_) decl_simple_lock_data(,(_m_))
#define RF_DECLARE_STATIC_MUTEX(_m_) decl_simple_lock_data(static,(_m_))
#define RF_DECLARE_EXTERN_MUTEX(_m_) decl_simple_lock_data(extern,(_m_))
#define RF_DECLARE_COND(_c_) int _c_;
#define RF_DECLARE_STATIC_COND(_c_) static int _c_;
#define RF_DECLARE_EXTERN_COND(_c_) extern int _c_;
#define RF_LOCK_MUTEX(_m_) simple_lock(&(_m_))
#define RF_UNLOCK_MUTEX(_m_) simple_unlock(&(_m_))
/*
* In Net- and OpenBSD, kernel threads are simply processes which share several
* substructures and never run in userspace.
*
* XXX Note, Net- and OpenBSD does not yet have a wakeup_one(), so we always
* XXX get Thundering Herd when a condition occurs.
*/
#define RF_WAIT_COND(_c_,_m_) { \
RF_UNLOCK_MUTEX(_m_); \
tsleep(&_c_, PRIBIO, "rfwcond", 0); \
RF_LOCK_MUTEX(_m_); \
}
#define RF_SIGNAL_COND(_c_) wakeup(&(_c_))
#define RF_BROADCAST_COND(_c_) wakeup(&(_c_))
#define RF_CREATE_THREAD(_handle_, _func_, _arg_) \
kthread_create((void (*) __P((void *)))(_func_), (void *)(_arg_), \
(struct proc **)&(_handle_), "raid")
struct RF_ThreadGroup_s {
int created;
int running;
int shutdown;
RF_DECLARE_MUTEX(mutex)
RF_DECLARE_COND(cond)
};
/*
* Someone has started a thread in the group
*/
#define RF_THREADGROUP_STARTED(_g_) { \
RF_LOCK_MUTEX((_g_)->mutex); \
(_g_)->created++; \
RF_UNLOCK_MUTEX((_g_)->mutex); \
}
/*
* Thread announcing that it is now running
*/
#define RF_THREADGROUP_RUNNING(_g_) { \
RF_LOCK_MUTEX((_g_)->mutex); \
(_g_)->running++; \
RF_UNLOCK_MUTEX((_g_)->mutex); \
RF_SIGNAL_COND((_g_)->cond); \
}
/*
* Thread announcing that it is now done
*/
#define RF_THREADGROUP_DONE(_g_) { \
RF_LOCK_MUTEX((_g_)->mutex); \
(_g_)->shutdown++; \
RF_UNLOCK_MUTEX((_g_)->mutex); \
RF_SIGNAL_COND((_g_)->cond); \
}
/*
* Wait for all threads to start running
*/
#define RF_THREADGROUP_WAIT_START(_g_) { \
RF_LOCK_MUTEX((_g_)->mutex); \
while((_g_)->running < (_g_)->created) { \
RF_WAIT_COND((_g_)->cond, (_g_)->mutex); \
} \
RF_UNLOCK_MUTEX((_g_)->mutex); \
}
/*
* Wait for all threads to stop running
*/
#if !defined(__NetBSD__) && !defined(__OpenBSD__)
#define RF_THREADGROUP_WAIT_STOP(_g_) { \
RF_LOCK_MUTEX((_g_)->mutex); \
RF_ASSERT((_g_)->running == (_g_)->created); \
while((_g_)->shutdown < (_g_)->running) { \
RF_WAIT_COND((_g_)->cond, (_g_)->mutex); \
} \
RF_UNLOCK_MUTEX((_g_)->mutex); \
}
#else
/* XXX Note that we've removed the assert. That should get put back in once
* we actually get something like a kernel thread running */
#define RF_THREADGROUP_WAIT_STOP(_g_) { \
RF_LOCK_MUTEX((_g_)->mutex); \
while((_g_)->shutdown < (_g_)->running) { \
RF_WAIT_COND((_g_)->cond, (_g_)->mutex); \
} \
RF_UNLOCK_MUTEX((_g_)->mutex); \
}
#endif
int rf_mutex_init(struct simplelock *);
int rf_mutex_destroy(struct simplelock *);
int
_rf_create_managed_mutex(RF_ShutdownList_t **, struct simplelock *,
char *, int);
int
_rf_create_managed_cond(RF_ShutdownList_t ** listp, int *,
char *file, int line);
int rf_cond_init(int *c); /* XXX need to write?? */
int rf_cond_destroy(int *c);/* XXX need to write?? */
#endif /* !_RF__RF_THREADSTUFF_H_ */
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