Go Cond: Difference between revisions
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* [[Go_Package_sync#Cond|The <tt>sync</tt> Package]] | * [[Go_Package_sync#Cond|The <tt>sync</tt> Package]] | ||
=Overview= | =Overview= | ||
<code>Cond</code> implements a '''condition variable''', a rendezvous point for goroutines waiting for or announcing the occurrence of an event. Each <code>Cond</code> has an associated <code>Locker</code> <code>L</code> | <code>Cond</code> implements a '''condition variable''', a rendezvous point for goroutines waiting for or announcing the occurrence of an event. Each <code>Cond</code> has an associated <code>Locker</code> <code>L</code>, commonly a <code>*Mutex</code> or <code>*RWMutex</code>, which must be held when changing the condition and when calling the <code>Wait</code> method. A <code>Cond</code> must not be copied after first use. | ||
In the terminology of the Go memory model, <code>Cond</code> arranges that a call to <code>Broadcast()</code> or <code>Signal()</code> "synchronizes before" any <code>Wait</code> call that it unblocks. For many simple use cases, users will be better off using channels than a <code>Cond</code> (<code>Broadcast()</code> corresponds to closing a channel, and <code>Signal</code> corresponds to sending on a channel). | In the terminology of the Go memory model, <code>Cond</code> arranges that a call to <code>Broadcast()</code> or <code>Signal()</code> "synchronizes before" any <code>Wait</code> call that it unblocks. For many simple use cases, users will be better off using channels than a <code>Cond</code> (<code>Broadcast()</code> corresponds to closing a channel, and <code>Signal</code> corresponds to sending on a channel). | ||
Revision as of 03:53, 20 January 2024
Internal
Overview
Cond implements a condition variable, a rendezvous point for goroutines waiting for or announcing the occurrence of an event. Each Cond has an associated Locker L, commonly a *Mutex or *RWMutex, which must be held when changing the condition and when calling the Wait method. A Cond must not be copied after first use.
In the terminology of the Go memory model, Cond arranges that a call to Broadcast() or Signal() "synchronizes before" any Wait call that it unblocks. For many simple use cases, users will be better off using channels than a Cond (Broadcast() corresponds to closing a channel, and Signal corresponds to sending on a channel).