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Change to address bug #10334 and improve startup time on Mac. Use sync i/o for reads of less than 2K.

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git-svn-id: svn://10.0.0.236/trunk@40703 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
sdagley%netscape.com 1999-07-22 21:26:33 +00:00
parent 984b693bb3
commit 123327cd0e
1 changed files with 25 additions and 2 deletions
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27
mozilla/nsprpub/pr/src/md/mac/macio.c
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@ -245,13 +245,36 @@ PRInt32 ReadWriteProc(PRFileDesc *fd, void *buf, PRUint32 bytes, IOOperation op)
** with this thread.
** Don't compute error code from async call. Bug in OS returns a garbage value.
*/
me->io_pending = PR_TRUE;
me->io_fd = refNum;
me->md.osErrCode = noErr;
if (op == READ_ASYNC)
(void) PBReadAsync(&pbAsync);
{
/*
** Skanky optimization so that reads < 2K are actually done synchronously
** to optimize performance on small reads (e.g. registry reads on startup)
*/
if (bytes > 2048L)
{
me->io_pending = PR_TRUE; /* Only mark thread io pending in async call */
(void) PBReadAsync(&pbAsync);
}
else
{
(void) PBReadSync(&pbAsync);
/*
** This is probbaly redundant but want to make sure we indicate the read
** is complete so we don't wander off into the Sargasso Sea of Mac
** threading
*/
pbAsync.pb.ioParam.ioResult = 0;
}
}
else
{
/* writes are currently always async so mark thread io pending */
me->io_pending = PR_TRUE;
(void) PBWriteAsync(&pbAsync);
}
/* See if the i/o call is still pending before we actually yield */
if (pbAsync.pb.ioParam.ioResult == 1)