QSharedMemory & QSystemSemaphore in Qt 7: Difference between revisions
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==Session Summary== | ==Session Summary== | ||
What to do with QSharedMemory and QSystemSemaphore | |||
==Session Owners== | ==Session Owners== | ||
Thiago Macieira | |||
==Notes== | |||
(Note: recreated from memory, note taker had a laptop trouble and the file wasn't saved) | |||
Add link to list archive | |||
* Thiago proposed deprecating now and moving to Qt6CoreCompat in Qt 7 | |||
** No replacement class | |||
** Fabian has volunteered to investigate a replacement API before Qt 6.10 | |||
* We'll add the deprecation markers now, with a trigger time in the future | |||
** Markers can be disabled with a macro (opt-out) | |||
** Current uses of shouldn't be affected - any issues that you have are ones you've always had | |||
* We'll link to a doc page explaining how to replace QSharedMemory | |||
** Use QFile::map for simple sharing of memory | |||
** Update as we learn more about use-cases | |||
** Ask for contact if use-case isn't taken into account | |||
* Known uses: | |||
** Biggest user of QSharedMemory is QtSingleApplication | |||
*** Multiple different versions out there | |||
*** Thiago volunteers to fix it | |||
** Use D-Bus on Linux, figure out what to do elsewhere | |||
** qtwayland has one use of QSharedMemory too | |||
** Sharing of large data sets to avoid serialisation | |||
** Shared images (qtdeclarative) | |||
** Androidtestrunner (single-application exclusion) | |||
* WINE implements Windows semantics on Unix; we could investigate | |||
* memfd is the "correct" solution on Linux and FreeBSD | |||
** similar enough to Windows semantics (disappears on last close) | |||
** not portable elsewhere | |||
Revision as of 13:42, 1 December 2023
Session Summary
What to do with QSharedMemory and QSystemSemaphore
Session Owners
Thiago Macieira
Notes
(Note: recreated from memory, note taker had a laptop trouble and the file wasn't saved) Add link to list archive
- Thiago proposed deprecating now and moving to Qt6CoreCompat in Qt 7
- No replacement class
- Fabian has volunteered to investigate a replacement API before Qt 6.10
- We'll add the deprecation markers now, with a trigger time in the future
- Markers can be disabled with a macro (opt-out)
- Current uses of shouldn't be affected - any issues that you have are ones you've always had
- We'll link to a doc page explaining how to replace QSharedMemory
- Use QFile::map for simple sharing of memory
- Update as we learn more about use-cases
- Ask for contact if use-case isn't taken into account
- Known uses:
- Biggest user of QSharedMemory is QtSingleApplication
- Multiple different versions out there
- Thiago volunteers to fix it
- Use D-Bus on Linux, figure out what to do elsewhere
- qtwayland has one use of QSharedMemory too
- Sharing of large data sets to avoid serialisation
- Shared images (qtdeclarative)
- Androidtestrunner (single-application exclusion)
- Biggest user of QSharedMemory is QtSingleApplication
- WINE implements Windows semantics on Unix; we could investigate
- memfd is the "correct" solution on Linux and FreeBSD
- similar enough to Windows semantics (disappears on last close)
- not portable elsewhere