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| author | Rich Felker <dalias@aerifal.cx> | 2011-03-24 23:16:52 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-03-24 23:16:52 -0400 |
| commit | a37452430f93700aeb122d693959ad79d8e43ada (patch) | |
| tree | 6ed8879bddb17c2b0db8c8bbd4778e11912f0767 /src/stdio/ftrylockfile.c | |
| parent | d8dc2faf1033e134e3a8f39bdf15c065f4d234be (diff) | |
| download | musl-a37452430f93700aeb122d693959ad79d8e43ada.tar.gz musl-a37452430f93700aeb122d693959ad79d8e43ada.tar.xz musl-a37452430f93700aeb122d693959ad79d8e43ada.zip | |
simplify and optimize FILE lock handling
Diffstat (limited to 'src/stdio/ftrylockfile.c')
| -rw-r--r-- | src/stdio/ftrylockfile.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/stdio/ftrylockfile.c b/src/stdio/ftrylockfile.c index 1d0a1ff8..67f4b6a0 100644 --- a/src/stdio/ftrylockfile.c +++ b/src/stdio/ftrylockfile.c @@ -3,16 +3,16 @@ int ftrylockfile(FILE *f) { + int tid = pthread_self()->tid; if (!libc.lockfile) libc.lockfile = __lockfile; - if (f->owner && f->owner == pthread_self()->tid) { + if (f->lock == tid) { if (f->lockcount == INT_MAX) return -1; f->lockcount++; return 0; } - if (a_swap(&f->lock, 1)) + if (f->lock || a_cas(&f->lock, 0, tid)) return -1; - f->owner = pthread_self()->tid; f->lockcount = 1; return 0; } |