Hanging while inotify_add_watch(): race conditions about libinotify-kqueue HOT 11 CLOSED

mkdir -p /tmp/test/1

cat > /tmp/main.c << EOF
#include <sys/inotify.h>

int main() {
        int inotify_d = inotify_init();
        inotify_add_watch(inotify_d, "/tmp/test", 0x2000fce);
        return inotify_add_watch(inotify_d, "/tmp/test/1", 0x2000fce);
}
EOF
gcc49 -linotify /tmp/main.c -o /tmp/test.bin
/tmp/test.bin

[root@freebsd10 /tmp/libinotify-kqueue]# make test
Running test suite...
..............xx.......xx.....x....xx...xx...xx.x.............

In test "Start-stop test":
    failed: all produced events are registered after resume

In test "Start-stop directory":
    failed: receive all events on a resumed watch
    failed: receive events for a same file from both watches (sometimes this test fails event on Linux, at least on 2.6.39)

In test "Update watch flags":
    failed: receive notifications on modify with flags = IN_ATTRIB | IN_MODIFY
    failed: do not receive notifications on touch with flags = IN_MODIFY 

In test "Update directory flags":
    failed: receive modify notifications for files in a directory with IN_MODIFY

In test "Open/close notifications":
    failed: receive IN_OPEN on cat
    failed: receive IN_CLOSE_NOWRITE on cat
    failed: receive IN_OPEN on ls
    failed: receive IN_CLOSE_NOWRITE on ls
    failed: receive IN_OPEN on modify
    failed: receive IN_CLOSE_WRITE on modify

--------------------
     Run: 62
  Passed: 50
  Failed: 12

[root@freebsd10 /usr/ports/devel/libinotify/work/dmatveev-libinotify-kqueue-2a0d601]# make test
gcc49 -O2 -pipe  -I/usr/ports/devel/libinotify/work/dmatveev-libinotify-kqueue-2a0d601 -DNDEBUG -pthread -std=gnu99 -fstack-protector  -linotify -L/usr/local/lib test.c  -o test
[root@freebsd10 /usr/ports/devel/libinotify/work/dmatveev-libinotify-kqueue-2a0d601]# make test
`test' is up to date.
[root@freebsd10 /usr/ports/devel/libinotify/work/dmatveev-libinotify-kqueue-2a0d601]# ./test
Watching the current directory

[root@freebsd10 /usr/ports/devel/libinotify/work/dmatveev-libinotify-kqueue-2a0d601]# time /tmp/test.bin

real    0m0.003s
user    0m0.000s
sys     0m0.008s

Main                             Worker
----                             ------
inotify_add_watch()              kevent()
  worker_cmd_add()                :
  write(fd, "*")      ---------> kevent() returns
  worker_cmd_wait()                process_command()
    ik_barrier_wait()                worker_cmd_wait()
    [1]                                ik_barrier_wait()
                                       [2]

Thread A     Thread B
--------     --------
Enter(c=0)       :
  Sleep        Enter(c=1)
  Wake up <--    Signal
Leave            :   
Destroy          :
Init(c=0)        :
Enter(c=1)       :
                 Busy wait(c=1)