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-rw-r--r--mISDN.cpp8
1 files changed, 7 insertions, 1 deletions
diff --git a/mISDN.cpp b/mISDN.cpp
index 3e7751e..035b78b 100644
--- a/mISDN.cpp
+++ b/mISDN.cpp
@@ -1834,8 +1834,11 @@ static int mISDN_upqueue(struct lcr_fd *fd, unsigned int what, void *instance, i
char byte;
/* unset global semaphore */
- read(fd->fd, &byte, 1);
upqueue_avail = 0;
+ // with a very small incident, upqueue_avail may be set by mISDN thread and
+ // another byte may be sent to the pipe, which causes a call to this function
+ // again with nothing in the upqueue. this is no problem.
+ read(fd->fd, &byte, 1);
/* process all ports */
mISDNport = mISDNport_first;
@@ -2060,6 +2063,9 @@ int do_layer3(struct mlayer3 *ml3, unsigned int cmd, unsigned int pid, struct l3
l3m->pid = pid;
mqueue_tail(&mISDNport->upqueue, mb);
if (!upqueue_avail) {
+ // multiple threads may cause multiple calls of this section, but this
+ // results only in multiple processing of the upqueue read.
+ // this is no problem.
upqueue_avail = 1;
char byte = 0;
write(upqueue_pipe[1], &byte, 1);