62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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#include <thread.h>
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#include "threadimpl.h"
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int32_t
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iocall(Ioproc *io, int32_t (*op)(va_list*), ...)
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{
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int ret, inted;
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Ioproc *msg;
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if(send(io->c, &io) == -1){
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jehanne_werrstr("interrupted");
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return -1;
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}
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assert(!io->inuse);
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io->inuse = 1;
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io->op = op;
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va_start(io->arg, op);
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msg = io;
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inted = 0;
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while(send(io->creply, &msg) == -1){
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msg = nil;
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inted = 1;
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}
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if(inted){
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jehanne_werrstr("interrupted");
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return -1;
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}
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/*
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* If we get interrupted, we have to stick around so that
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* the IO proc has someone to talk to. Send it an interrupt
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* and try again.
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*/
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inted = 0;
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while(recv(io->creply, nil) == -1){
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inted = 1;
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iointerrupt(io);
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}
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USED(inted);
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va_end(io->arg);
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ret = io->ret;
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if(ret < 0)
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sys_errstr(io->err, sizeof io->err);
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io->inuse = 0;
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/* release resources */
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while(send(io->creply, &io) == -1)
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;
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return ret;
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}
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