mirror/libowfat
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

recent kernel return POLLERR and then calling read returns EGAIN which

Browse Source 
leads to busy loop. Try to work around.
This commit is contained in:
leitner 2022-03-11 12:07:53 +00:00
parent c9e9ecfb6a
commit fc223dc725
3 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
io/io_tryread.c
View File

@ -105,8 +105,10 @@ int64 io_tryread(int64 d,char* buf,int64 len) {
if (!e->nonblock) {
setitimer(ITIMER_REAL,&old,0);
}
if (r==-1 && errno==EAGAIN)
if (r==-1 && errno==EAGAIN) {
if (e->goterror) r=-3;
io_eagain_read(d);
}
if (r==-1) {
if (errno==EINTR) errno=EAGAIN;
if (errno!=EAGAIN)

1
io/io_waituntil2.c
View File

@ -167,6 +167,7 @@ int64 io_waituntil2(int64 milliseconds) {
/* error; signal whatever app is looking for */
if (e->wantread) y[i].events|=POLLIN;
if (e->wantwrite) y[i].events|=POLLOUT;
e->goterror=1; // prevent busy loop if the kernel return EAGAIN on read
}
newevents=0;

1
io_internal.h
View File

@ -49,6 +49,7 @@ typedef struct {
unsigned int epolladded:1;
unsigned int closed:1; /* io_close called, but close deferred because of outstanding events */
unsigned int zerocopy:1; /* linux: setsockopt SO_ZEROCOPY done */
unsigned int goterror:1; /* got POLLERR|POLLHUP */
#ifdef __MINGW32__
unsigned int readqueued:2;
unsigned int writequeued:2;