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# Work around FAM problem on Linux

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Avoid the hang caused by filling up FAM's event buffer when mounting
lots of directories

This was SVN commit r5130.
This commit is contained in:
Ykkrosh 2007-06-02 17:04:05 +00:00
parent 33c3a8ed97
commit c1d0a25b55
1 changed files with 19 additions and 0 deletions
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19
source/lib/sysdep/unix/dir_watch_fam.cpp
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@ -74,6 +74,25 @@ LibError dir_add_watch(const char* const n_full_path, intptr_t* const watch)
WARN_RETURN(ERR::FAIL); // no way of getting error code?
}
// Monitoring a directory causes a FAMExists event per file in that directory, then a
// FAMEndExist. We have to wait for these events, else the FAM server's write buffer fills
// up and we get deadlocked when trying to open another directory. (That happens only with
// the original fam, and seems fixed in gamin, but we want to work with both.)
FAMEvent e;
do {
if(FAMNextEvent(&fc, &e) < 0)
{
// Oops, failed - rather than getting stuck waiting forever for a
// FAMEndExist event that may never come, just give up and return now.
debug_warn("FAMNextEvent failed");
return ERR::FAIL;
}
// (We might be missing some real events other than the FAMExists ones, if
// they happen to be generated right now. That's not a critical problem, so
// just ignore it.)
}
while (e.code != FAMEndExist);
*watch = (intptr_t)req.reqnum;
dirs[*watch] = n_full_path;
return INFO::OK;