diff options
Diffstat (limited to 'src/libthread/iocall.c')
-rw-r--r-- | src/libthread/iocall.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/libthread/iocall.c b/src/libthread/iocall.c new file mode 100644 index 00000000..d9cf9d04 --- /dev/null +++ b/src/libthread/iocall.c @@ -0,0 +1,49 @@ +#include "threadimpl.h" + +long +iocall(Ioproc *io, long (*op)(va_list*), ...) +{ + int ret, inted; + Ioproc *msg; + + if(send(io->c, &io) == -1){ + werrstr("interrupted"); + return -1; + } + assert(!io->inuse); + io->inuse = 1; + io->op = op; + va_start(io->arg, op); + msg = io; + inted = 0; + while(send(io->creply, &msg) == -1){ + msg = nil; + inted = 1; + } + if(inted){ + werrstr("interrupted"); + return -1; + } + + /* + * If we get interrupted, we have stick around so that + * the IO proc has someone to talk to. Send it an interrupt + * and try again. + */ + inted = 0; + while(recv(io->creply, nil) == -1){ + inted = 1; + iointerrupt(io); + } + USED(inted); + va_end(io->arg); + ret = io->ret; + if(ret < 0) + errstr(io->err, sizeof io->err); + io->inuse = 0; + + /* release resources */ + while(send(io->creply, &io) == -1) + ; + return ret; +} |