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Add godoc comments indicating that a mutex is needed for use with goroutines #22

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Add godoc comments indicating that a mutex is needed for use with goroutines #22

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5 changes: 4 additions & 1 deletion magicmime.go
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Original file line number Diff line number Diff line change
Expand Up @@ -124,7 +124,10 @@ const (
// NewDecoder creates a detector that uses libmagic. It initializes
// the opens the magicmime database with the specified flags. Upon
// success users are expected to call Close on the returned Decoder
// when it is no longer needed.
// when it is no longer needed. Access to the magicmime
// database is not synchronized; the magicmime database file-descriptor
// is referenced through a global variable. Add mutex Lock/Unlock around
// the magicmime functions if using multiple goroutines.
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@ctrochalakis ctrochalakis Jan 15, 2018 •
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Does that mean we should guard between calls to a specific Decoder's methods? Or between calls to magicmime.NewDecoder() calls? or both?

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Pretty sure that it's only between calls to a specific Decoder.

func NewDecoder(flags Flag) (*Decoder, error) {
db := C.magic_open(C.int(0))
if db == nil {
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