Function wakeup_pthread

src/bthread/butex.cpp:136–144

namespace bthread {

static void wakeup_pthread(ButexPthreadWaiter* pw) {
    // release fence makes wait_pthread see changes before wakeup.
    pw->sig.store(PTHREAD_SIGNALLED, butil::memory_order_release);
    // At this point, wait_pthread() possibly has woken up and destroyed `pw'.
    // In which case, futex_wake_private() should return EFAULT.
    // If crash happens in future, `pw' can be made TLS and never destroyed
    // to solve the issue.
    futex_wake_private(&pw->sig, 1);
}

bool erase_from_butex(ButexWaiter*, bool, WaiterState);