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| author | Rich Felker <dalias@aerifal.cx> | 2011-03-16 10:39:45 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-03-16 10:39:45 -0400 |
| commit | 4d9cc0b399b1d6a146cb45e64c74b7ee562de7a6 (patch) | |
| tree | 20619f38692d102d4e61d23f0c52f8ad144f29d6 | |
| parent | 9dd7d7e3f6a90ae00e83fd98f30c48389c4f5ab2 (diff) | |
| download | musl-4d9cc0b399b1d6a146cb45e64c74b7ee562de7a6.tar.gz musl-4d9cc0b399b1d6a146cb45e64c74b7ee562de7a6.tar.xz musl-4d9cc0b399b1d6a146cb45e64c74b7ee562de7a6.zip | |
optimize file locking: avoid cache-polluting writes to global storage
| -rw-r--r-- | src/stdio/flockfile.c | 6 | ||||
| -rw-r--r-- | src/stdio/ftrylockfile.c | 2 |
2 files changed, 5 insertions, 3 deletions
diff --git a/src/stdio/flockfile.c b/src/stdio/flockfile.c index 1b6ef580..440a36a9 100644 --- a/src/stdio/flockfile.c +++ b/src/stdio/flockfile.c @@ -3,7 +3,9 @@ void flockfile(FILE *f) { - pthread_self(); - libc.lockfile = __lockfile; + if (!libc.lockfile) { + pthread_self(); + libc.lockfile = __lockfile; + } __lockfile(f); } diff --git a/src/stdio/ftrylockfile.c b/src/stdio/ftrylockfile.c index 725b66e7..1d0a1ff8 100644 --- a/src/stdio/ftrylockfile.c +++ b/src/stdio/ftrylockfile.c @@ -3,7 +3,7 @@ int ftrylockfile(FILE *f) { - libc.lockfile = __lockfile; + if (!libc.lockfile) libc.lockfile = __lockfile; if (f->owner && f->owner == pthread_self()->tid) { if (f->lockcount == INT_MAX) return -1; |