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authorZac Medico <zmedico@gentoo.org>2020-03-04 22:46:26 -0800
committerZac Medico <zmedico@gentoo.org>2020-03-05 00:06:19 -0800
commitd389b3b378d88b8c41dfaba2a90bc9643a9ba99e (patch)
tree8d5a663f1c41ebef45b879724829f5e66bd6f253 /testpath
parentUpdates for portage-2.3.92 release (diff)
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Scheduler: use add_done_callback (bug 711322)
Use add_done_callback instead of addExistListener, in order to avoid callback races like the SequentialTaskQueue exit listener race that triggered bug 711322. The addExistListener method is prone to races because its listeners are executed in quick succession. In contrast, callbacks scheduled via add_done_callback are placed in a fifo queue, ensuring that they execute in an order that is unsurprising relative to other callbacks. Bug: https://bugs.gentoo.org/711322 Signed-off-by: Zac Medico <zmedico@gentoo.org>
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