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Annotation of OSKit-Mach/ipc/ipc_target.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1994 The University of Utah and
        !             3:  * the Computer Systems Laboratory (CSL).  All rights reserved.
        !             4:  *
        !             5:  * Permission to use, copy, modify and distribute this software and its
        !             6:  * documentation is hereby granted, provided that both the copyright
        !             7:  * notice and this permission notice appear in all copies of the
        !             8:  * software, derivative works or modified versions, and any portions
        !             9:  * thereof, and that both notices appear in supporting documentation.
        !            10:  *
        !            11:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            12:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            13:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            14:  *
        !            15:  * CSL requests users of this software to return to [email protected] any
        !            16:  * improvements that they make and grant CSL redistribution rights.
        !            17:  */
        !            18: /*
        !            19:  *     File:   ipc_target.c
        !            20:  *
        !            21:  *     Implementation for common part of IPC ports and port sets
        !            22:  *     representing a target of messages and migrating RPCs.
        !            23:  */
        !            24: 
        !            25: #include "sched_prim.h"
        !            26: #include "ipc_target.h"
        !            27: 
        !            28: void
        !            29: ipc_target_init(struct ipc_target *ipt, mach_port_t name)
        !            30: {
        !            31:        ipt->ipt_name = name;
        !            32:        ipc_mqueue_init(&ipt->ipt_messages);
        !            33: 
        !            34: #ifdef MIGRATING_THREADS
        !            35:        ipt->ipt_type = IPT_TYPE_MESSAGE_RPC;
        !            36:        ipt->ipt_acts = 0;
        !            37: 
        !            38:        ipc_target_machine_init(ipt);
        !            39: #endif
        !            40: }
        !            41: 
        !            42: void
        !            43: ipc_target_terminate(struct ipc_target *ipt)
        !            44: {
        !            45: }
        !            46: 
        !            47: #ifdef MIGRATING_THREADS
        !            48: struct Act *
        !            49: ipc_target_block(struct ipc_target *ipt)
        !            50: {
        !            51:        struct Act *act;
        !            52: 
        !            53:        ipt_lock(ipt);
        !            54:        while ((act = ipt->ipt_acts) == 0) {
        !            55:                /* XXX mp unsafe */
        !            56:                ipt->ipt_waiting = 1;
        !            57:                ipt_unlock(ipt);
        !            58:                thread_wait((int)&ipt->ipt_acts, FALSE);
        !            59:                ipt_lock(ipt);
        !            60:        }
        !            61:        ipt->ipt_acts = act->ipt_next;
        !            62:        ipt_unlock(ipt);
        !            63: 
        !            64:        return act;
        !            65: }
        !            66: 
        !            67: void
        !            68: ipc_target_wakeup(struct ipc_target *ipt)
        !            69: {
        !            70:        ipt_lock(ipt);
        !            71:        if (ipt->ipt_waiting) {
        !            72:                thread_wakeup((int)&ipt->ipt_acts);
        !            73:                ipt->ipt_waiting = 0;
        !            74:        }
        !            75:        ipt_unlock(ipt);
        !            76: }
        !            77: #endif /* MIGRATING_THREADS */
        !            78: 

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