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#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;
}
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