Conditional Wait Variables

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Your videos are really useful. Thank you so much, my professors doesn't seem to know how to explain it and you do so in less than 2 minutes

alvarorogerzapata
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If Thread B hits the cond_wait before thread A locks the mutex, doesn't this deadlock? Thread B holds the lock and doesn't release it until cond_wait is signaled which only happens after thread A acquires a lock which is impossible because thread B is holding the lock.

EDIT: Nevermind, realized cond_wait has two arguments and synchronizes with the lock to ensure this doesn't happen.

MartinCharles
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"is_done=1" for Thread-A should come before mutex_lock(). Here, once Thread-A gets mutex lock then we are setting is_done . if we already got lock then why do we need to set it at all. Please let me know if i am missing something.

NarendraPalSingh_India
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There is a convention that uses while instead of if to check the condition for whether to actually wait. Why is it?

HengZhong-jq