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author | Frans Kaashoek <[email protected]> | 2011-08-26 10:08:29 -0400 |
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committer | Frans Kaashoek <[email protected]> | 2011-08-26 10:08:29 -0400 |
commit | 3a5fa7ed9020eaf8ab843a16d26db7393b2ec072 (patch) | |
tree | bfa4ad4ae03d7d21796bacaa7eab8e3d3e4ab365 /buf.h | |
parent | 8a9b6dbd4468f6312f1d07226a623879f970bd4b (diff) | |
download | xv6-labs-3a5fa7ed9020eaf8ab843a16d26db7393b2ec072.tar.gz xv6-labs-3a5fa7ed9020eaf8ab843a16d26db7393b2ec072.tar.bz2 xv6-labs-3a5fa7ed9020eaf8ab843a16d26db7393b2ec072.zip |
Introduce and use sleeplocks instead of BUSY flags
Remove I_BUSY, B_BUSY, and intrans defs and usages
One spinlock per buf to avoid ugly loop in bget
fix race in filewrite (don't update f->off after releasing lock)
Diffstat (limited to 'buf.h')
-rw-r--r-- | buf.h | 7 |
1 files changed, 4 insertions, 3 deletions
@@ -2,12 +2,13 @@ struct buf { int flags; uint dev; uint sector; + struct spinlock lock; + struct sleeplock sleeplock; struct buf *prev; // LRU cache list struct buf *next; struct buf *qnext; // disk queue uchar data[512]; }; -#define B_BUSY 0x1 // buffer is locked by some process -#define B_VALID 0x2 // buffer has been read from disk -#define B_DIRTY 0x4 // buffer needs to be written to disk +#define B_VALID 0x1 // buffer has been read from disk +#define B_DIRTY 0x2 // buffer needs to be written to disk |