Return to rf_mcpair.c CVS log

Up to [local] / sys / dev / raidframe

Annotation of sys/dev/raidframe/rf_mcpair.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: rf_mcpair.c,v 1.3 2002/12/16 07:01:04 tdeval Exp $    */
        !             2: /*     $NetBSD: rf_mcpair.c,v 1.3 1999/02/05 00:06:13 oster Exp $      */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1995 Carnegie-Mellon University.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Author: Jim Zelenka
        !             9:  *
        !            10:  * Permission to use, copy, modify and distribute this software and
        !            11:  * its documentation is hereby granted, provided that both the copyright
        !            12:  * notice and this permission notice appear in all copies of the
        !            13:  * software, derivative works or modified versions, and any portions
        !            14:  * thereof, and that both notices appear in supporting documentation.
        !            15:  *
        !            16:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            17:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
        !            18:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            19:  *
        !            20:  * Carnegie Mellon requests users of this software to return to
        !            21:  *
        !            22:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
        !            23:  *  School of Computer Science
        !            24:  *  Carnegie Mellon University
        !            25:  *  Pittsburgh PA 15213-3890
        !            26:  *
        !            27:  * any improvements or extensions that they make and grant Carnegie the
        !            28:  * rights to redistribute these changes.
        !            29:  */
        !            30:
        !            31: /*
        !            32:  * rf_mcpair.c
        !            33:  * An mcpair is a structure containing a mutex and a condition variable.
        !            34:  * It's used to block the current thread until some event occurs.
        !            35:  */
        !            36:
        !            37: #include "rf_types.h"
        !            38: #include "rf_threadstuff.h"
        !            39: #include "rf_mcpair.h"
        !            40: #include "rf_debugMem.h"
        !            41: #include "rf_freelist.h"
        !            42: #include "rf_shutdown.h"
        !            43:
        !            44: #include <sys/proc.h>
        !            45:
        !            46: static RF_FreeList_t *rf_mcpair_freelist;
        !            47:
        !            48: #define        RF_MAX_FREE_MCPAIR      128
        !            49: #define        RF_MCPAIR_INC            16
        !            50: #define        RF_MCPAIR_INITIAL        24
        !            51:
        !            52: int  rf_init_mcpair(RF_MCPair_t *);
        !            53: void rf_clean_mcpair(RF_MCPair_t *);
        !            54: void rf_ShutdownMCPair(void *);
        !            55:
        !            56:
        !            57: int
        !            58: rf_init_mcpair(RF_MCPair_t *t)
        !            59: {
        !            60:        int rc;
        !            61:
        !            62:        rc = rf_mutex_init(&t->mutex);
        !            63:        if (rc) {
        !            64:                RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n",
        !            65:                    __FILE__, __LINE__, rc);
        !            66:                return (rc);
        !            67:        }
        !            68:        rc = rf_cond_init(&t->cond);
        !            69:        if (rc) {
        !            70:                RF_ERRORMSG3("Unable to init cond file %s line %d rc=%d\n",
        !            71:                    __FILE__, __LINE__, rc);
        !            72:                rf_mutex_destroy(&t->mutex);
        !            73:                return (rc);
        !            74:        }
        !            75:        return (0);
        !            76: }
        !            77:
        !            78: void
        !            79: rf_clean_mcpair(RF_MCPair_t *t)
        !            80: {
        !            81:        rf_mutex_destroy(&t->mutex);
        !            82:        rf_cond_destroy(&t->cond);
        !            83: }
        !            84:
        !            85: void
        !            86: rf_ShutdownMCPair(void *ignored)
        !            87: {
        !            88:        RF_FREELIST_DESTROY_CLEAN(rf_mcpair_freelist, next, (RF_MCPair_t *),
        !            89:            rf_clean_mcpair);
        !            90: }
        !            91:
        !            92: int
        !            93: rf_ConfigureMCPair(RF_ShutdownList_t **listp)
        !            94: {
        !            95:        int rc;
        !            96:
        !            97:        RF_FREELIST_CREATE(rf_mcpair_freelist, RF_MAX_FREE_MCPAIR,
        !            98:            RF_MCPAIR_INC, sizeof(RF_MCPair_t));
        !            99:        rc = rf_ShutdownCreate(listp, rf_ShutdownMCPair, NULL);
        !           100:        if (rc) {
        !           101:                RF_ERRORMSG3("Unable to add to shutdown list file %s line %d"
        !           102:                    " rc=%d\n", __FILE__, __LINE__, rc);
        !           103:                rf_ShutdownMCPair(NULL);
        !           104:                return (rc);
        !           105:        }
        !           106:        RF_FREELIST_PRIME_INIT(rf_mcpair_freelist, RF_MCPAIR_INITIAL, next,
        !           107:            (RF_MCPair_t *), rf_init_mcpair);
        !           108:        return (0);
        !           109: }
        !           110:
        !           111: RF_MCPair_t *
        !           112: rf_AllocMCPair(void)
        !           113: {
        !           114:        RF_MCPair_t *t;
        !           115:
        !           116:        RF_FREELIST_GET_INIT(rf_mcpair_freelist, t, next, (RF_MCPair_t *),
        !           117:            rf_init_mcpair);
        !           118:        if (t) {
        !           119:                t->flag = 0;
        !           120:                t->next = NULL;
        !           121:        }
        !           122:        return (t);
        !           123: }
        !           124:
        !           125: void
        !           126: rf_FreeMCPair(RF_MCPair_t *t)
        !           127: {
        !           128:        RF_FREELIST_FREE_CLEAN(rf_mcpair_freelist, t, next, rf_clean_mcpair);
        !           129: }
        !           130:
        !           131: /*
        !           132:  * The callback function used to wake you up when you use an mcpair to wait
        !           133:  * for something.
        !           134:  */
        !           135: void
        !           136: rf_MCPairWakeupFunc(RF_MCPair_t *mcpair)
        !           137: {
        !           138:        RF_LOCK_MUTEX(mcpair->mutex);
        !           139:        mcpair->flag = 1;
        !           140: #if 0
        !           141:        printf("MCPairWakeupFunc called!\n");
        !           142: #endif
        !           143:        wakeup(&(mcpair->flag)); /* XXX Does this do anything useful !!!  GO */
        !           144:        /*
        !           145:         * XXX
        !           146:         * Looks like the following is needed to truly get the
        !           147:         * functionality they were looking for here...  This could be a
        !           148:         * side-effect of my using a tsleep in the Net- and OpenBSD port
        !           149:         * though...
        !           150:         * XXX
        !           151:         */
        !           152:        wakeup(&(mcpair->cond));        /* XXX XXX XXX GO */
        !           153:        RF_UNLOCK_MUTEX(mcpair->mutex);
        !           154: }