14 Jun
2018
14 Jun
'18
1:29 p.m.
On Thu, Jun 14, 2018 at 01:54:15PM +0200, Thomas Hellstrom wrote:
On 06/14/2018 01:36 PM, Peter Zijlstra wrote:
Currently you don't allow mixing WD and WW contexts (which is not immediately obvious from the above code), and the above hard relies on that. Are there sensible use cases for mixing them? IOW will your current restriction stand without hassle?
Contexts _must_ agree on the algorithm used to resolve deadlocks. With Wait-Die, for example, older transactions will wait if a lock is held by a younger transaction and with Wound-Wait, younger transactions will wait if a lock is held by an older transaction so there is no way of mixing them.
Maybe the compiler should be enforcing that; ie make it a different type?