Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | |||
| en:docs:os2:api:vio [2021/09/14 09:47] – prokushev | en:docs:os2:api:vio [2021/09/14 09:51] (current) – prokushev | ||
|---|---|---|---|
| Line 78: | Line 78: | ||
| Return to application | Return to application | ||
| </ | </ | ||
| + | |||
| In OS/2 2.0 and later VIO still 16-bit. In late OS/2 versions (3.x?) actual code of Video subsystem and Base Video Subsysten was moved to DOSCALLS.DLL (see Fig). VIOCALLS and BVSCALLS is a forwarders to DOSCALLS. | In OS/2 2.0 and later VIO still 16-bit. In late OS/2 versions (3.x?) actual code of Video subsystem and Base Video Subsysten was moved to DOSCALLS.DLL (see Fig). VIOCALLS and BVSCALLS is a forwarders to DOSCALLS. | ||
| - | |||
| - | < | ||
| - | Application calls VioGetAnsi in VIOCALLS | ||
| - | VIOCALLS forwards to DOSCALLs | ||
| - | VioGetAnsi calls VioRoute | ||
| - | if AVS registered then VioRoute calls AVS VioGetAnsi | ||
| - | if AVS VioGetAnsi requires to call BVS then VioRouter сalls BVS VioGetAnsi | ||
| - | BVSCALLS forwards to DOSCALLS | ||
| - | else VioRouter calls BVS VioGetAnsi | ||
| - | BVSCALLS forwards to DOSCALLS | ||
| - | |||
| - | Return to application | ||
| - | </ | ||
| As not part of official OS/2 distribution three independed versions of 32-to-16 bit wrapper subsystems was developed (See Fig). EXMWRAP.DLL was part of eComstation 1.0 and later releases. | As not part of official OS/2 distribution three independed versions of 32-to-16 bit wrapper subsystems was developed (See Fig). EXMWRAP.DLL was part of eComstation 1.0 and later releases. | ||
| - | |||
| < | < | ||
| Line 123: | Line 110: | ||
| |DDD|DDD=Global Video Subsystem | |DDD|DDD=Global Video Subsystem | ||
| </ | </ | ||
| + | |||
| + | < | ||
| + | Application calls VioGetAnsi in VIOCALLS | ||
| + | VIOCALLS forwards to DOSCALLS | ||
| + | VioGetAnsi calls VioRoute | ||
| + | if AVS registered then | ||
| + | VioRoute calls AVS VioGetAnsi | ||
| + | if AVS VioGetAnsi requires to call BVS then | ||
| + | VioRouter сalls BVS VioGetAnsi | ||
| + | BVSCALLS forwards to DOSCALLS | ||
| + | else | ||
| + | VioRouter calls BVS VioGetAnsi | ||
| + | BVSCALLS forwards to DOSCALLS | ||
| + | If GVS registered then | ||
| + | VioRouter calls GVS VioGetAnsi | ||
| + | Return to application | ||
| + | </ | ||
| osFree attempts to combine all aproaches and provide following callflow | osFree attempts to combine all aproaches and provide following callflow | ||