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libdraw: make ebread() return buffer immidiately if available, cleanup

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this reduces number of syscalls and improves performance for vt
This commit is contained in:
cinap_lenrek 2013-08-11 08:31:53 +02:00
parent 62bd2ae8b9
commit 09d465a976
1 changed files with 6 additions and 16 deletions
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20
sys/src/libdraw/event.c
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@ -45,21 +45,10 @@ Ebuf*
ebread(Slave *s) ebread(Slave *s)
{ {
Ebuf *eb; Ebuf *eb;
Dir *d;
ulong l;
for(;;){ while((eb = s->head) == 0)
d = dirfstat(epipe[0]);
if(d == nil)
drawerror(display, "events: eread stat error");
l = d->length;
free(d);
if(s->head && l==0)
break;
extract(); extract();
} s->head = eb->next;
eb = s->head;
s->head = s->head->next;
if(s->head == 0) if(s->head == 0)
s->tail = 0; s->tail = 0;
return eb; return eb;
@ -322,9 +311,10 @@ loop:
memmove(eb->buf, &ebuf[1], n - 1); memmove(eb->buf, &ebuf[1], n - 1);
eb->next = 0; eb->next = 0;
if(s->head) if(s->head)
s->tail = s->tail->next = eb; s->tail->next = eb;
else else
s->head = s->tail = eb; s->head = eb;
s->tail = eb;
} }
static int static int