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lib: allow infinite sleep in poll()

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If fd_poll() is called with no file descriptors, an incorrect check in
the function prelude causes it to return instantly; for a thread that
wishes to poll but has no file descriptors, this results in busy
waiting. Desired behavior is to block.

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2017-06-05 20:18:48 +00:00
parent 8899960086
commit 82fc5591f4
1 changed files with 0 additions and 3 deletions
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3
lib/thread.c
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@ -647,9 +647,6 @@ static int
fd_poll (struct thread_master *m, struct pollfd *pfds, nfds_t pfdsize,
nfds_t count, struct timeval *timer_wait)
{
if (count == 0)
return 0;
/* If timer_wait is null here, that means poll() should block indefinitely,
* unless the thread_master has overriden it by setting ->selectpoll_timeout.
* If the value is positive, it specifies the maximum number of milliseconds