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authorAndreas Schneider <asn@cynapses.org>2010-06-22 10:43:44 +0200
committerAndreas Schneider <asn@cynapses.org>2010-06-22 14:44:35 +0200
commit4581b24b485a26fccccb7099371e78c6a00b5f5f (patch)
tree6d1c83a095c859ccd3a632763ca7eb7e6f5e91dd
parent1d84821d93e8d31d3be1d81a764449426f8e4a2b (diff)
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poll: Added a comment to the bsd_poll() implementation.
-rw-r--r--libssh/poll.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/libssh/poll.c b/libssh/poll.c
index 5514774..6f187e5 100644
--- a/libssh/poll.c
+++ b/libssh/poll.c
@@ -118,6 +118,16 @@ 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;