new futex-requeue-based pthread_cond_broadcast implementation
authorRich Felker <dalias@aerifal.cx>
Sun, 25 Sep 2011 06:38:03 +0000 (02:38 -0400)
committerRich Felker <dalias@aerifal.cx>
Sun, 25 Sep 2011 06:38:03 +0000 (02:38 -0400)
commitcba4e1c0a3423ed07ef5c79f6e29360996f32fd7
treeb0b71361525510d796f448dd506d8f8f6140ca41
parent97c5b5a87c3d9df54278e1073d6177f77536bd32
new futex-requeue-based pthread_cond_broadcast implementation

this avoids the "stampede effect" where pthread_cond_broadcast would
result in all waiters waking up simultaneously, only to immediately
contend for the mutex and go back to sleep.
src/internal/pthread_impl.h
src/thread/pthread_cond_broadcast.c
src/thread/pthread_cond_init.c
src/thread/pthread_cond_timedwait.c