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VFS : simplification of handling asyn selects

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- select_request_async() returns no ops by default

- wantops in do_select() always set correctly, do_select() does
  not need a special case for SUSPEND (and ugly code)
This commit is contained in:
Tomas Hruby 2012-02-20 13:16:58 +00:00
parent 369a12704f
commit f19d8df184
1 changed files with 8 additions and 12 deletions
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20
servers/vfs/select.c
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@ -215,10 +215,8 @@ PUBLIC int do_select(void)
wantops = (f->filp_select_ops |= ops);
r = do_select_request(se, fd, &wantops);
if (r != OK) {
if (r == SUSPEND) continue;
else break; /* Error or bogus return code; abort */
}
if (r != OK && r != SUSPEND)
break; /* Error or bogus return code; abort */
/* The select request above might have turned on/off some
* operations because they were 'ready' or not meaningful.
@ -339,6 +337,9 @@ PRIVATE int select_request_async(struct filp *f, int *ops, int block)
rops = *ops;
/* By default, nothing to do */
*ops = 0;
if (!block && (f->filp_select_flags & FSF_BLOCKED)) {
/* This filp is blocked waiting for a reply, but we don't want to
* block ourselves. Unless we're awaiting the initial reply, these
@ -350,13 +351,10 @@ PRIVATE int select_request_async(struct filp *f, int *ops, int block)
rops &= ~SEL_WR;
if ((rops & SEL_ERR) && (f->filp_select_flags & FSF_ERR_BLOCK))
rops &= ~SEL_ERR;
if (!(rops & (SEL_RD|SEL_WR|SEL_ERR))) {
/* Nothing left to do */
*ops = 0;
if (!(rops & (SEL_RD|SEL_WR|SEL_ERR)))
return(OK);
}
}
}
f->filp_select_flags |= FSF_UPDATE;
if (block) {
@ -952,10 +950,8 @@ PRIVATE void select_restart_filps()
vp = f->filp_vno;
assert((vp->v_mode & I_TYPE) == I_CHAR_SPECIAL);
r = do_select_request(se, fd, &wantops);
if (r != OK) {
if (r == SUSPEND) continue;
else break; /* Error or bogus return code; abort */
}
if (r != OK && r != SUSPEND)
break; /* Error or bogus return code; abort */
if (wantops & ops) ops2tab(wantops, fd, se);
}
}