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This change reworks the condition variables support for VxWorks to address the very legit points raised by Rasmus in https://gcc.gnu.org/pipermail/gcc/2020-May/232524.html While some of the issues were taken care of by the use of semFlush, a few others were indeed calling for adjustments. We first considered resorting to the condvarLib library available in VxWorks7. Unfortunately, it is vx7 only and we wanted something working for at least vx 6.9 as well. It also turned out requiring the use of recursive mutexes for condVarWait, which seemed unnecessarily constraining. Instead, this change corrects the sequencing logic in a few places and leverages the semExchange API to ensure the key atomicity requirement on cond_wait operations. 2020-10-14 Alexandre Oliva <oliva@adacore.com> libgcc/ * config/gthr-vxworks-thread.c: Include stdlib.h. (tls_delete_hook): Prototype it. (__gthread_cond_signal): Return early if no waiters. Consume signal in case the semaphore got full. Use semInfoGet instead of kernel-mode-only semInfo. (__gthread_cond_timedwait): Use semExchange. Always take the mutex again before returning. * config/gthr-vxworks-cond.c (__ghtread_cond_wait): Likewise.
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