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/* $OpenBSD: rf_mcpair.c,v 1.1 1999/01/11 14:29:29 niklas Exp $ */
/* $NetBSD: rf_mcpair.c,v 1.1 1998/11/13 04:20:31 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: 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.
*/
/* rf_mcpair.c
* an mcpair is a structure containing a mutex and a condition variable.
* it's used to block the current thread until some event occurs.
*/
/* :
* Log: rf_mcpair.c,v
* Revision 1.16 1996/06/19 22:23:01 jimz
* parity verification is now a layout-configurable thing
* not all layouts currently support it (correctly, anyway)
*
* Revision 1.15 1996/06/17 03:18:04 jimz
* include shutdown.h for macroized ShutdownCreate
*
* Revision 1.14 1996/06/10 11:55:47 jimz
* Straightened out some per-array/not-per-array distinctions, fixed
* a couple bugs related to confusion. Added shutdown lists. Removed
* layout shutdown function (now subsumed by shutdown lists).
*
* Revision 1.13 1996/06/05 18:06:02 jimz
* Major code cleanup. The Great Renaming is now done.
* Better modularity. Better typing. Fixed a bunch of
* synchronization bugs. Made a lot of global stuff
* per-desc or per-array. Removed dead code.
*
* Revision 1.12 1996/06/02 17:31:48 jimz
* Moved a lot of global stuff into array structure, where it belongs.
* Fixed up paritylogging, pss modules in this manner. Some general
* code cleanup. Removed lots of dead code, some dead files.
*
* Revision 1.11 1996/05/30 23:22:16 jimz
* bugfixes of serialization, timing problems
* more cleanup
*
* Revision 1.10 1996/05/20 16:15:22 jimz
* switch to rf_{mutex,cond}_{init,destroy}
*
* Revision 1.9 1996/05/18 19:51:34 jimz
* major code cleanup- fix syntax, make some types consistent,
* add prototypes, clean out dead code, et cetera
*
* Revision 1.8 1996/05/16 16:04:42 jimz
* convert to return-val on FREELIST init
*
* Revision 1.7 1996/05/16 14:47:21 jimz
* rewrote to use RF_FREELIST
*
* Revision 1.6 1995/12/01 19:25:43 root
* added copyright info
*
*/
#include "rf_types.h"
#include "rf_threadstuff.h"
#include "rf_mcpair.h"
#include "rf_debugMem.h"
#include "rf_freelist.h"
#include "rf_shutdown.h"
#if (defined(__NetBSD__) || defined(__OpenBSD__)) && defined(_KERNEL)
#include <sys/proc.h>
#endif
static RF_FreeList_t *rf_mcpair_freelist;
#define RF_MAX_FREE_MCPAIR 128
#define RF_MCPAIR_INC 16
#define RF_MCPAIR_INITIAL 24
static int init_mcpair(RF_MCPair_t *);
static void clean_mcpair(RF_MCPair_t *);
static void rf_ShutdownMCPair(void *);
static int init_mcpair(t)
RF_MCPair_t *t;
{
int rc;
rc = rf_mutex_init(&t->mutex);
if (rc) {
RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__,
__LINE__, rc);
return(rc);
}
rc = rf_cond_init(&t->cond);
if (rc) {
RF_ERRORMSG3("Unable to init cond file %s line %d rc=%d\n", __FILE__,
__LINE__, rc);
rf_mutex_destroy(&t->mutex);
return(rc);
}
return(0);
}
static void clean_mcpair(t)
RF_MCPair_t *t;
{
rf_mutex_destroy(&t->mutex);
rf_cond_destroy(&t->cond);
}
static void rf_ShutdownMCPair(ignored)
void *ignored;
{
RF_FREELIST_DESTROY_CLEAN(rf_mcpair_freelist,next,(RF_MCPair_t *),clean_mcpair);
}
int rf_ConfigureMCPair(listp)
RF_ShutdownList_t **listp;
{
int rc;
RF_FREELIST_CREATE(rf_mcpair_freelist, RF_MAX_FREE_MCPAIR,
RF_MCPAIR_INC, sizeof(RF_MCPair_t));
rc = rf_ShutdownCreate(listp, rf_ShutdownMCPair, NULL);
if (rc) {
RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n",
__FILE__, __LINE__, rc);
rf_ShutdownMCPair(NULL);
return(rc);
}
RF_FREELIST_PRIME_INIT(rf_mcpair_freelist, RF_MCPAIR_INITIAL,next,
(RF_MCPair_t *),init_mcpair);
return(0);
}
RF_MCPair_t *rf_AllocMCPair()
{
RF_MCPair_t *t;
RF_FREELIST_GET_INIT(rf_mcpair_freelist,t,next,(RF_MCPair_t *),init_mcpair);
if (t) {
t->flag = 0;
t->next = NULL;
}
return(t);
}
void rf_FreeMCPair(t)
RF_MCPair_t *t;
{
RF_FREELIST_FREE_CLEAN(rf_mcpair_freelist,t,next,clean_mcpair);
}
/* the callback function used to wake you up when you use an mcpair to wait for something */
void rf_MCPairWakeupFunc(mcpair)
RF_MCPair_t *mcpair;
{
RF_LOCK_MUTEX(mcpair->mutex);
mcpair->flag = 1;
#if 0
printf("MCPairWakeupFunc called!\n");
#endif
#ifdef KERNEL
wakeup(&(mcpair->flag)); /* XXX Does this do anything useful!! GO */
/*
* XXX Looks like the following is needed to truly get the
* functionality they were looking for here... This could be a
* side-effect of my using a tsleep in the Net- and OpenBSD port
* though... XXX
*/
#if (defined(__NetBSD__) || defined(__OpenBSD__)) && defined(_KERNEL)
wakeup(&(mcpair->cond)); /* XXX XXX XXX GO */
#endif
#else /* KERNEL */
RF_SIGNAL_COND(mcpair->cond);
#endif /* KERNEL */
RF_UNLOCK_MUTEX(mcpair->mutex);
}
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