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Diffstat (limited to '')
| -rw-r--r-- | src/encoder/OggSerial.cxx | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/encoder/OggSerial.cxx b/src/encoder/OggSerial.cxx new file mode 100644 index 000000000..5659762f2 --- /dev/null +++ b/src/encoder/OggSerial.cxx @@ -0,0 +1,43 @@ +/* + * Copyright (C) 2003-2012 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "OggSerial.hxx" +#include "system/Clock.hxx" +#include "Compiler.h" + +#include <atomic> + +static std::atomic_uint next_ogg_serial; + +int +GenerateOggSerial() +{ + unsigned serial = ++next_ogg_serial; + if (gcc_unlikely(serial < 16)) { + /* first-time initialization: seed with a clock value, + which is random enough for our use */ + + /* this code is not race-free, but good enough */ + const unsigned seed = MonotonicClockMS(); + next_ogg_serial = serial = seed; + } + + return serial; +} + |