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### 1490. Mutex requirements too stringent

Section: 32.5.4 [thread.mutex.requirements] Status: Resolved Submitter: Switzerland Opened: 2010-08-25 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses CH-27

The mutex requirements force `try_lock` to be `noexcept(true)`. However, where they are used by the generic algorithms, those relax this requirement and say that `try_lock` may throw. This means the requirement is too stringent, also a non-throwing `try_lock` does not allow for a diagnostic such as `system_error` that `lock()` will give us.

[ Resolution proposed by ballot comment: ]

> delete p18, adjust 30.4.4 p1 and p4 accordingly

[ 2010-11-01 Daniel comments: ]

> Accepting n3130 would solve this issue.

Proposed resolution:

Resolved by n3197.