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| author | Frans Kaashoek <kaashoek@mit.edu> | 2022-08-10 20:35:42 -0400 |
|---|---|---|
| committer | Frans Kaashoek <kaashoek@mit.edu> | 2022-08-10 20:35:42 -0400 |
| commit | 4087a6e7fc773ba4eb217dfc196dfe1eee84b25d (patch) | |
| tree | a77a5b04944ed3f83ea10875aa32b1322e4224c6 /kernel/pipe.c | |
| parent | b1fd09335ae1c112a01cedad0a6abd584fe8dca7 (diff) | |
| download | xv6-labs-2022-4087a6e7fc773ba4eb217dfc196dfe1eee84b25d.tar.xz xv6-labs-2022-4087a6e7fc773ba4eb217dfc196dfe1eee84b25d.zip | |
Read and write p->killed using atomics
Diffstat (limited to 'kernel/pipe.c')
| -rw-r--r-- | kernel/pipe.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/pipe.c b/kernel/pipe.c index b6eefb9..e438d7e 100644 --- a/kernel/pipe.c +++ b/kernel/pipe.c @@ -81,7 +81,7 @@ pipewrite(struct pipe *pi, uint64 addr, int n) acquire(&pi->lock); while(i < n){ - if(pi->readopen == 0 || pr->killed){ + if(pi->readopen == 0 || __sync_add_and_fetch(&pr->killed,0)){ release(&pi->lock); return -1; } @@ -111,7 +111,7 @@ piperead(struct pipe *pi, uint64 addr, int n) acquire(&pi->lock); while(pi->nread == pi->nwrite && pi->writeopen){ //DOC: pipe-empty - if(pr->killed){ + if(__sync_add_and_fetch(&pr->killed,0)){ release(&pi->lock); return -1; } |