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Add a mini-rant to the top comment explaining why threads are

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required. (I just tried getting rid of them; it worked fine for
serial ports, but not for anything else. The Windows I/O API sucks.)

[originally from svn r6843]
This commit is contained in:
Simon Tatham 2006-09-03 12:55:16 +00:00
parent de84239159
commit 33e827818a
1 changed files with 11 additions and 0 deletions
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11
windows/winhandl.c
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@ -16,6 +16,17 @@
* write; so the output thread waits for an event object notifying
* it to _attempt_ a write, and then it sets an event in return
* when one completes.
*
* (It's terribly annoying having to spawn a subthread for each
* direction of each handle. Technically it isn't necessary for
* serial ports, since we could use overlapped I/O within the main
* thread and wait directly on the event objects in the OVERLAPPED
* structures. However, we can't use this trick for some types of
* file handle at all - for some reason Windows restricts use of
* OVERLAPPED to files which were opened with the overlapped flag -
* and so we must use threads for those. This being the case, it's
* simplest just to use threads for everything rather than trying
* to keep track of multiple completely separate mechanisms.)
*/
#include <assert.h>