diff options
Diffstat (limited to 'src/stdio/flockfile.c')
| -rw-r--r-- | src/stdio/flockfile.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/stdio/flockfile.c b/src/stdio/flockfile.c index a196c1ef..6b574cf0 100644 --- a/src/stdio/flockfile.c +++ b/src/stdio/flockfile.c @@ -1,10 +1,14 @@ #include "stdio_impl.h" #include "pthread_impl.h" +#define MAYBE_WAITERS 0x40000000 + void flockfile(FILE *f) { while (ftrylockfile(f)) { int owner = f->lock; - if (owner) __wait(&f->lock, &f->waiters, owner, 1); + if (!owner) continue; + a_cas(&f->lock, owner, owner|MAYBE_WAITERS); + __futexwait(&f->lock, owner|MAYBE_WAITERS, 1); } } |