add POSIX locking to authkey.c

fix esound protocol cpu consumption when finishing a stream


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@242 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 17 insertions, 0 deletions

diff --git a/polyp/util.c b/polyp/util.c
index 6be6ffe4..166a9a45 100644
--- a/polyp/util.c
+++ b/polyp/util.c
@@ -501,3 +501,20 @@ finish:
     pa_xfree(gids);
     return r;
 }
+
+int pa_lock_file(int fd, int b) {
+
+    struct flock flock;
+
+    flock.l_type = b ? F_WRLCK : F_UNLCK;
+    flock.l_whence = SEEK_SET;
+    flock.l_start = 0;
+    flock.l_len = 0;
+
+    if (fcntl(fd, F_SETLKW, &flock) < 0) {
+        pa_log(__FILE__": %slock failed: %s\n", !b ? "un" : "", strerror(errno));
+        return -1;
+    }
+
+    return 0;
+}