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| author | Rich Felker <dalias@aerifal.cx> | 2011-03-12 21:55:45 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-03-12 21:55:45 -0500 |
| commit | 5eb0d33ec0f08b123c5c10877d6258d05fa9453a (patch) | |
| tree | 85ff7f5397424685d89af8176ff7ce6d6f46f6e2 /src/stdio/__lockfile.c | |
| parent | d8d19f4d46284d5b6124710a5235b6fe090c013f (diff) | |
| download | musl-5eb0d33ec0f08b123c5c10877d6258d05fa9453a.tar.gz musl-5eb0d33ec0f08b123c5c10877d6258d05fa9453a.tar.bz2 musl-5eb0d33ec0f08b123c5c10877d6258d05fa9453a.tar.xz musl-5eb0d33ec0f08b123c5c10877d6258d05fa9453a.zip | |
implement flockfile api, rework stdio locking
Diffstat (limited to 'src/stdio/__lockfile.c')
| -rw-r--r-- | src/stdio/__lockfile.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/stdio/__lockfile.c b/src/stdio/__lockfile.c new file mode 100644 index 00000000..82f50b42 --- /dev/null +++ b/src/stdio/__lockfile.c @@ -0,0 +1,19 @@ +#include "stdio_impl.h" +#include "pthread_impl.h" + +void __lockfile(FILE *f) +{ + int spins; + if (f->owner < 0) return; + if (f->owner && f->owner == __pthread_self()->tid) { + while (f->lockcount == INT_MAX); + f->lockcount++; + return; + } + spins = 100000; + while (a_swap(&f->lock, 1)) + if (spins) spins--, a_spin(); + else syscall0(__NR_sched_yield); + f->owner = __pthread_self()->tid; + f->lockcount = 1; +} |