Race Conditions in Sherwood Threadqueue

[insertinterestingnamehere]

The thread sanitizer is flagging several issues with the Sherwood threadqueue too. Here are a few of them:

Non-atomic write:

qthreads/src/threadqueues/sherwood_threadqueues.c

Line 322 in a2d1dba

q->head = node;

Non-atomic read:

qthreads/src/threadqueues/sherwood_threadqueues.c

Line 845 in a2d1dba

} else if (q->head) {

Something non-atomic is still happening in the TRYLOCK macros/functions.
Non-atomic read at:

qthreads/src/threadqueues/sherwood_threadqueues.c

Line 846 in a2d1dba

QTHREAD_TRYLOCK_LOCK(&q->qlock);

Atomic write at:

qthreads/src/threadqueues/sherwood_threadqueues.c

Line 328 in a2d1dba

QTHREAD_TRYLOCK_UNLOCK(&q->qlock);

There are several more errors.