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manojampalam 2016-02-24 13:50:35 -08:00
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@ -36,6 +36,7 @@ Brief design details of POSIX wrapper
+ Uses [APCs](https://msdn.microsoft.com/en-us/library/windows/desktop/ms681951(v=vs.85).aspx) wherever available and minimzing use of [events](https://msdn.microsoft.com/en-us/library/windows/desktop/ms682655(v=vs.85).aspx). This simplifies code and has performance benefits. + Uses [APCs](https://msdn.microsoft.com/en-us/library/windows/desktop/ms681951(v=vs.85).aspx) wherever available and minimzing use of [events](https://msdn.microsoft.com/en-us/library/windows/desktop/ms682655(v=vs.85).aspx). This simplifies code and has performance benefits.
+ Maintains internal buffers to accommodate an underlying fundamental difference between POSIX and Win32 IO APIs - IOReady Vs IOComplete (Ex for a Read operation, POSIX APIs signal when IO is ready - date will be subsequently, explicitly read, Win32 APIs signal when IO has completed - data is already copied to a user provided buffer. Though this may be perceived as a performance hit, a validation exercise did not show any major impact. It in fact proved beneficial in reducing kernel calls during "read"s (ex. reading a header, would fetch the entire packet in a single call). + Maintains internal buffers to accommodate an underlying fundamental difference between POSIX and Win32 IO APIs - IOReady Vs IOComplete (Ex for a Read operation, POSIX APIs signal when IO is ready - date will be subsequently, explicitly read, Win32 APIs signal when IO has completed - data is already copied to a user provided buffer. Though this may be perceived as a performance hit, a validation exercise did not show any major impact. It in fact proved beneficial in reducing kernel calls during "read"s (ex. reading a header, would fetch the entire packet in a single call).
+ Additional details on underlying Win32 calls used + Additional details on underlying Win32 calls used
| POSIX IO call | Underlying Win32 IO call | Additional details | | POSIX IO call | Underlying Win32 IO call | Additional details |
|:-----|:-----|:-----| |:-----|:-----|:-----|
| accept | AcceptEx | No APC semantics so, explicit event used for async IO | | accept | AcceptEx | No APC semantics so, explicit event used for async IO |