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/* $OpenBSD: rf_mcpair.c,v 1.2 1999/02/16 00:02:56 niklas Exp $ */
/* $NetBSD: rf_mcpair.c,v 1.3 1999/02/05 00:06:13 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.
*/
#include "rf_types.h"
#include "rf_threadstuff.h"
#include "rf_mcpair.h"
#include "rf_debugMem.h"
#include "rf_freelist.h"
#include "rf_shutdown.h"
#include <sys/proc.h>
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
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 */
wakeup(&(mcpair->cond));/* XXX XXX XXX GO */
RF_UNLOCK_MUTEX(mcpair->mutex);
}
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