static/jsvm/interfaces/sync.Mutex.html
A Mutex is a mutual exclusion lock. The zero value for a Mutex is an unlocked mutex.
A Mutex must not be copied after first use.
In the terminology of the Go memory model, the n'th call to [Mutex.Unlock] “synchronizes before” the m'th call to [Mutex.Lock] for any n < m. A successful call to [Mutex.TryLock] is equivalent to a call to Lock. A failed call to TryLock does not establish any “synchronizes before” relation at all.
Lock locks m. If the lock is already in use, the calling goroutine blocks until the mutex is available.
TryLock tries to lock m and reports whether it succeeded.
Note that while correct uses of TryLock do exist, they are rare, and use of TryLock is often a sign of a deeper problem in a particular use of mutexes.
Unlock unlocks m. It is a run-time error if m is not locked on entry to Unlock.
A locked [Mutex] is not associated with a particular goroutine. It is allowed for one goroutine to lock a Mutex and then arrange for another goroutine to unlock it.
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