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52 lines
1.4 KiB
52 lines
1.4 KiB
package conc
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import (
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"sync"
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"github.com/sourcegraph/conc/panics"
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)
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// NewWaitGroup creates a new WaitGroup.
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func NewWaitGroup() *WaitGroup {
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return &WaitGroup{}
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}
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// WaitGroup is the primary building block for scoped concurrency.
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// Goroutines can be spawned in the WaitGroup with the Go method,
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// and calling Wait() will ensure that each of those goroutines exits
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// before continuing. Any panics in a child goroutine will be caught
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// and propagated to the caller of Wait().
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//
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// The zero value of WaitGroup is usable, just like sync.WaitGroup.
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// Also like sync.WaitGroup, it must not be copied after first use.
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type WaitGroup struct {
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wg sync.WaitGroup
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pc panics.Catcher
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}
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// Go spawns a new goroutine in the WaitGroup.
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func (h *WaitGroup) Go(f func()) {
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h.wg.Add(1)
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go func() {
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defer h.wg.Done()
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h.pc.Try(f)
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}()
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}
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// Wait will block until all goroutines spawned with Go exit and will
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// propagate any panics spawned in a child goroutine.
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func (h *WaitGroup) Wait() {
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h.wg.Wait()
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// Propagate a panic if we caught one from a child goroutine.
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h.pc.Repanic()
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}
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// WaitAndRecover will block until all goroutines spawned with Go exit and
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// will return a *panics.Recovered if one of the child goroutines panics.
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func (h *WaitGroup) WaitAndRecover() *panics.Recovered {
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h.wg.Wait()
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// Return a recovered panic if we caught one from a child goroutine.
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return h.pc.Recovered()
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}
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