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venti: make sure arena checksum jobs cannot be missed

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This commit is contained in:
Russ Cox 2008-07-03 22:39:59 -04:00
parent d4bf606d29
commit 01c1b7633c
1 changed files with 8 additions and 5 deletions
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13
src/cmd/venti/srv/arena.c
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@ -31,7 +31,9 @@ initarenasum(void)
{ {
needzeroscore(); /* OS X */ needzeroscore(); /* OS X */
qlock(&sumlock);
sumwait.l = &sumlock; sumwait.l = &sumlock;
qunlock(&sumlock);
if(vtproc(sumproc, nil) < 0){ if(vtproc(sumproc, nil) < 0){
seterr(EOk, "can't start arena checksum slave: %r"); seterr(EOk, "can't start arena checksum slave: %r");
@ -478,9 +480,6 @@ backsumarena(Arena *arena)
{ {
ASum *as; ASum *as;
if(sumwait.l == nil)
return;
as = MK(ASum); as = MK(ASum);
if(as == nil) if(as == nil)
return; return;
@ -492,7 +491,12 @@ backsumarena(Arena *arena)
else else
sumq = as; sumq = as;
sumqtail = as; sumqtail = as;
rwakeup(&sumwait); /*
* Might get here while initializing arenas,
* before initarenasum has been called.
*/
if(sumwait.l)
rwakeup(&sumwait);
qunlock(&sumlock); qunlock(&sumlock);
} }
@ -513,7 +517,6 @@ sumproc(void *unused)
qunlock(&sumlock); qunlock(&sumlock);
arena = as->arena; arena = as->arena;
free(as); free(as);
sumarena(arena); sumarena(arena);
} }
} }