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author | Andreas Schneider <asn@cynapses.org> | 2010-06-22 10:43:44 +0200 |
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committer | Andreas Schneider <asn@cynapses.org> | 2010-06-22 14:45:08 +0200 |
commit | e67fafd60f3985399a0586e4743b6c81d9a412a4 (patch) | |
tree | 798a243e03e2ee3f7911f71f4962c2722554f3b2 | |
parent | a2a98fb5bc1462d2338c5c2dbe799d8e72d23630 (diff) | |
download | libssh-e67fafd60f3985399a0586e4743b6c81d9a412a4.tar.gz libssh-e67fafd60f3985399a0586e4743b6c81d9a412a4.tar.xz libssh-e67fafd60f3985399a0586e4743b6c81d9a412a4.zip |
poll: Added a comment to the bsd_poll() implementation.
-rw-r--r-- | libssh/poll.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libssh/poll.c b/libssh/poll.c index 1837d25e..59d37647 100644 --- a/libssh/poll.c +++ b/libssh/poll.c @@ -93,6 +93,16 @@ static HINSTANCE hlib; #include <sys/time.h> #endif + +/* + * This is a poll(2)-emulation using select for systems not providing a native + * poll implementation. + * + * Keep in mind that select is terribly inefficient. The interface is simply not + * meant to be used with maximum descriptor value greater, say, 32 or so. With + * a value as high as 1024 on Linux you'll pay dearly in every single call. + * poll() will be orders of magnitude faster. + */ static int bsd_poll(ssh_pollfd_t *fds, nfds_t nfds, int timeout) { fd_set readfds, writefds, exceptfds; struct timeval tv, *ptv; |