Fix race condition in task scheduler #1763
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Description
This PR fixes a concurrency issue that could cause scheduled tasks to be executed before their time.
This problem would occur whenever two threads were waiting for the same task (same timeout) at the same time.
As a bonus, I've replaced the
system_clockfor asteady_clockwhich is better in this case since we're always calculating time differences.Changes in Client or Server public APIs
[] It includes documentation for these changes in
/doc.