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Be principled: acquire lock first

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This commit is contained in:
Frans Kaashoek 2020-11-05 11:09:21 -05:00
parent 38084bcea8
commit b4c2851bb3
1 changed files with 1 additions and 1 deletions
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2
kernel/log.c
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@ -216,12 +216,12 @@ log_write(struct buf *b)
{ {
int i; int i;
acquire(&log.lock);
if (log.lh.n >= LOGSIZE || log.lh.n >= log.size - 1) if (log.lh.n >= LOGSIZE || log.lh.n >= log.size - 1)
panic("too big a transaction"); panic("too big a transaction");
if (log.outstanding < 1) if (log.outstanding < 1)
panic("log_write outside of trans"); panic("log_write outside of trans");
acquire(&log.lock);
for (i = 0; i < log.lh.n; i++) { for (i = 0; i < log.lh.n; i++) {
if (log.lh.block[i] == b->blockno) // log absorbtion if (log.lh.block[i] == b->blockno) // log absorbtion
break; break;