futex_wake - Wake some number of threads waiting on a futex.
#include <magenta/syscalls.h>
mx_status_t mx_futex_wake(const mx_futex_t* value_ptr, uint32_t wake_count);
Waking a futex causes wake_count threads waiting on the value_ptr
futex to be woken up.
Waking up zero threads is not an error condition. Passing in an unallocated
address for value_ptr is not an error condition.
futex_wake() returns MX_OK on success.
MX_ERR_INVALID_ARGS value_ptr is not aligned.