tAdd fdwait routines. - plan9port - [fork] Plan 9 from user space
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---
(DIR) commit 2517c38a8c265bf80a3befbb9bb18863ba453504
(DIR) parent b4e0c548bc06218103c86aa0fd24293bc96eb41d
(HTM) Author: rsc <devnull@localhost>
Date: Sun, 29 Feb 2004 22:53:51 +0000
Add fdwait routines.
Diffstat:
A src/libthread/fdwait.c | 250 +++++++++++++++++++++++++++++++
1 file changed, 250 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/src/libthread/fdwait.c b/src/libthread/fdwait.c
t@@ -0,0 +1,250 @@
+#define NOPLAN9DEFINES
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+
+#include <errno.h>
+#include <poll.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+/*
+ * Poll file descriptors in an idle loop.
+ */
+
+typedef struct Poll Poll;
+
+struct Poll
+{
+ Channel *c; /* for sending back */
+};
+
+static Channel *sleepchan[64];
+static int sleeptime[64];
+static int nsleep;
+
+static struct pollfd pfd[64];
+static struct Poll polls[64];
+static int npoll;
+
+static void
+pollidle(void *v)
+{
+ int i, n, t;
+ uint now;
+
+ for(;; yield()){
+ //fprint(2, "poll %d:", npoll);
+ for(i=0; i<npoll; i++){
+ //fprint(2, " %d%c", pfd[i].fd, pfd[i].events==POLLIN ? 'r' : 'w');
+ pfd[i].revents = 0;
+ }
+ t = -1;
+ for(i=0; i<nsleep; i++){
+ now = p9nsec()/1000000;
+ n = sleeptime[i] - now;
+ if(n < 0)
+ n = 0;
+ if(t == -1 || n < t)
+ t = n;
+ }
+ //fprint(2, "\n");
+
+ n = poll(pfd, npoll, t);
+ //fprint(2, "poll ret %d:", n);
+ now = p9nsec()/1000000;
+ for(i=0; i<nsleep; i++){
+ if((int)(sleeptime[i] - now) < 0){
+ nbsendul(sleepchan[i], 0);
+ nsleep--;
+ sleepchan[i] = sleepchan[nsleep];
+ sleeptime[i] = sleeptime[nsleep];
+ i--;
+ }
+ }
+
+ if(n <= 0)
+ continue;
+ for(i=0; i<npoll; i++)
+ if(pfd[i].fd != -1 && pfd[i].revents){
+ //fprint(2, " %d", pfd[i].fd);
+ nbsendul(polls[i].c, 1);
+ pfd[i].fd = -1;
+ pfd[i].events = 0;
+ pfd[i].revents = 0;
+ }
+ //fprint(2, "\n");
+ }
+}
+
+void
+threadfdwaitsetup(void)
+{
+ static int setup = 0;
+
+ if(!setup){
+ setup = 1;
+ threadcreateidle(pollidle, nil, 16384);
+ }
+}
+
+void
+threadfdwait(int fd, int rw)
+{
+ int i;
+
+ struct {
+ Channel c;
+ ulong x;
+ } s;
+
+ threadfdwaitsetup();
+ chaninit(&s.c, sizeof(ulong), 1);
+ for(i=0; i<npoll; i++)
+ if(pfd[i].fd == -1)
+ break;
+ if(i==npoll){
+ if(npoll >= nelem(polls)){
+ fprint(2, "Too many polled fds.\n");
+ abort();
+ }
+ npoll++;
+ }
+
+ pfd[i].fd = fd;
+ pfd[i].events = rw=='r' ? POLLIN : POLLOUT;
+ polls[i].c = &s.c;
+ //threadstate("fdwait %d %d", f->fd, e);
+ recvul(&s.c);
+}
+
+void
+threadsleep(int ms)
+{
+ struct {
+ Channel c;
+ ulong x;
+ } s;
+
+ threadfdwaitsetup();
+ chaninit(&s.c, sizeof(ulong), 1);
+
+ sleepchan[nsleep] = &s.c;
+ sleeptime[nsleep++] = p9nsec()/1000000+ms;
+ recvul(&s.c);
+}
+
+void
+threadfdnoblock(int fd)
+{
+ fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0)|O_NONBLOCK);
+}
+
+long
+threadread(int fd, void *a, long n)
+{
+ int nn;
+
+ threadfdnoblock(fd);
+again:
+ nn = read(fd, a, n);
+ if(nn < 0){
+ if(errno == EINTR)
+ goto again;
+ if(errno == EAGAIN || errno == EWOULDBLOCK){
+ threadfdwait(fd, 'r');
+ goto again;
+ }
+ }
+ return nn;
+}
+
+int
+threadrecvfd(int fd)
+{
+ int nn;
+
+ threadfdnoblock(fd);
+again:
+ nn = recvfd(fd);
+ if(nn < 0){
+ if(errno == EINTR)
+ goto again;
+ if(errno == EAGAIN || errno == EWOULDBLOCK){
+ threadfdwait(fd, 'r');
+ goto again;
+ }
+ }
+ return nn;
+}
+
+int
+threadsendfd(int fd, int sfd)
+{
+ int nn;
+
+ threadfdnoblock(fd);
+again:
+ nn = sendfd(fd, sfd);
+ if(nn < 0){
+ if(errno == EINTR)
+ goto again;
+ if(errno == EAGAIN || errno == EWOULDBLOCK){
+ threadfdwait(fd, 'w');
+ goto again;
+ }
+ }
+ return nn;
+}
+
+long
+threadreadn(int fd, void *a, long n)
+{
+ int tot, nn;
+
+ for(tot = 0; tot<n; tot+=nn){
+ nn = threadread(fd, (char*)a+tot, n-tot);
+ if(nn <= 0){
+ if(tot == 0)
+ return nn;
+ return tot;
+ }
+ }
+ return tot;
+}
+
+long
+_threadwrite(int fd, const void *a, long n)
+{
+ int nn;
+
+ threadfdnoblock(fd);
+again:
+ nn = write(fd, a, n);
+ if(nn < 0){
+ if(errno == EINTR)
+ goto again;
+ if(errno == EAGAIN || errno == EWOULDBLOCK){
+ threadfdwait(fd, 'w');
+ goto again;
+ }
+ }
+ return nn;
+}
+
+long
+threadwrite(int fd, const void *a, long n)
+{
+ int tot, nn;
+
+ for(tot = 0; tot<n; tot+=nn){
+ nn = _threadwrite(fd, (char*)a+tot, n-tot);
+ if(nn <= 0){
+ if(tot == 0)
+ return nn;
+ return tot;
+ }
+ }
+ return tot;
+}
+