pi                 25 kernel/pipe.c    struct pipe *pi;
pi                 27 kernel/pipe.c    pi = 0;
pi                 31 kernel/pipe.c    if ((pi = (struct pipe *)kalloc()) == 0)
pi                 33 kernel/pipe.c    pi->readopen = 1;
pi                 34 kernel/pipe.c    pi->writeopen = 1;
pi                 35 kernel/pipe.c    pi->nwrite = 0;
pi                 36 kernel/pipe.c    pi->nread = 0;
pi                 37 kernel/pipe.c    initlock(&pi->lock, "pipe");
pi                 41 kernel/pipe.c    (*f0)->pipe = pi;
pi                 45 kernel/pipe.c    (*f1)->pipe = pi;
pi                 49 kernel/pipe.c    if (pi)
pi                 50 kernel/pipe.c      kfree((char *)pi);
pi                 59 kernel/pipe.c  pipeclose(struct pipe *pi, int writable)
pi                 61 kernel/pipe.c    acquire(&pi->lock);
pi                 63 kernel/pipe.c      pi->writeopen = 0;
pi                 64 kernel/pipe.c      wakeup(&pi->nread);
pi                 66 kernel/pipe.c      pi->readopen = 0;
pi                 67 kernel/pipe.c      wakeup(&pi->nwrite);
pi                 69 kernel/pipe.c    if (pi->readopen == 0 && pi->writeopen == 0) {
pi                 70 kernel/pipe.c      release(&pi->lock);
pi                 71 kernel/pipe.c      kfree((char *)pi);
pi                 73 kernel/pipe.c      release(&pi->lock);
pi                 77 kernel/pipe.c  pipewrite(struct pipe *pi, uint64 addr, int n)
pi                 82 kernel/pipe.c    acquire(&pi->lock);
pi                 84 kernel/pipe.c      if (pi->readopen == 0 || killed(pr)) {
pi                 85 kernel/pipe.c        release(&pi->lock);
pi                 88 kernel/pipe.c      if (pi->nwrite == pi->nread + PIPESIZE) { //DOC: pipewrite-full
pi                 89 kernel/pipe.c        wakeup(&pi->nread);
pi                 90 kernel/pipe.c        sleep_prepare(&pi->nwrite);
pi                 91 kernel/pipe.c        release(&pi->lock);
pi                 93 kernel/pipe.c        acquire(&pi->lock);
pi                101 kernel/pipe.c        pi->data[pi->nwrite++ % PIPESIZE] = ch;
pi                105 kernel/pipe.c    wakeup(&pi->nread);
pi                106 kernel/pipe.c    release(&pi->lock);
pi                112 kernel/pipe.c  piperead(struct pipe *pi, uint64 addr, int n)
pi                118 kernel/pipe.c    acquire(&pi->lock);
pi                119 kernel/pipe.c    while (pi->nread == pi->nwrite && pi->writeopen) { //DOC: pipe-empty
pi                121 kernel/pipe.c        release(&pi->lock);
pi                124 kernel/pipe.c      sleep_prepare(&pi->nread); //DOC: piperead-sleep
pi                125 kernel/pipe.c      release(&pi->lock);
pi                127 kernel/pipe.c      acquire(&pi->lock);
pi                130 kernel/pipe.c      if (pi->nread == pi->nwrite)
pi                132 kernel/pipe.c      ch = pi->data[pi->nread % PIPESIZE];
pi                138 kernel/pipe.c      pi->nread++;
pi                140 kernel/pipe.c    wakeup(&pi->nwrite); //DOC: piperead-wakeup
pi                141 kernel/pipe.c    release(&pi->lock);
pi               1189 user/usertests.c   int fd, pid, i, j, n, total, pi;
pi               1194 user/usertests.c   for (pi = 0; pi < NCHILD; pi++) {
pi               1195 user/usertests.c     fname = names[pi];
pi               1211 user/usertests.c       memset(buf, '0' + pi, SZ);
pi               1223 user/usertests.c   for (pi = 0; pi < NCHILD; pi++) {
pi               1256 user/usertests.c   int pid, i, fd, pi;
pi               1259 user/usertests.c   for (pi = 0; pi < NCHILD; pi++) {
pi               1267 user/usertests.c       name[0] = 'p' + pi;
pi               1290 user/usertests.c   for (pi = 0; pi < NCHILD; pi++) {
pi               1298 user/usertests.c     for (pi = 0; pi < NCHILD; pi++) {
pi               1299 user/usertests.c       name[0] = 'p' + pi;
pi               1315 user/usertests.c     for (pi = 0; pi < NCHILD; pi++) {
pi               1316 user/usertests.c       name[0] = 'p' + pi;