| 1 | /*
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| 2 | * returns a mutex-locked version of async function `fn`, which is assumed to
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| 3 | * return a promies.
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| 4 | */
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| 5 |
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| 6 | module.exports = function mutex (fn) {
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| 7 | var running
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| 8 | return function () {
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| 9 | if (running) return
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| 10 | running = true
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| 11 | fn.apply(this, arguments)
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| 12 | .then(function (data) { running = false; return data })
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| 13 | .catch(function (error) { running = false; throw error })
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| 14 | }
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| 15 | }
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| 16 |
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