From a37452430f93700aeb122d693959ad79d8e43ada Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Thu, 24 Mar 2011 23:16:52 -0400 Subject: simplify and optimize FILE lock handling --- src/stdio/__lockfile.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'src/stdio/__lockfile.c') diff --git a/src/stdio/__lockfile.c b/src/stdio/__lockfile.c index e4320f05..93c94867 100644 --- a/src/stdio/__lockfile.c +++ b/src/stdio/__lockfile.c @@ -3,17 +3,18 @@ void __lockfile(FILE *f) { - int spins; - if (f->owner < 0) return; - if (f->owner && f->owner == __pthread_self()->tid) { + int spins=100000; + int tid; + + if (f->lock < 0) return; + tid = __pthread_self()->tid; + if (f->lock == tid) { while (f->lockcount == INT_MAX); f->lockcount++; return; } - spins = 100000; - while (a_swap(&f->lock, 1)) + while (f->lock || a_cas(&f->lock, 0, tid)) if (spins) spins--, a_spin(); else syscall(SYS_sched_yield); - f->owner = __pthread_self()->tid; f->lockcount = 1; } -- cgit v1.2.1