diff options
author | Tim Blechmann <timblech@users.sourceforge.net> | 2004-07-14 16:21:44 +0000 |
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committer | IOhannes m zmölnig <zmoelnig@iem.at> | 2015-10-14 15:11:54 +0200 |
commit | d0ae3caca5828675335d3b19ab5dd987e7369b23 (patch) | |
tree | ffb89eb98dc91b1c1b471d2c221f18dafbfb48a6 /sc4pd/headers/server/IntFifo.h | |
parent | e0775c6066f90ece58bf84326ab7180cb6c3d539 (diff) |
This commit was generated by cvs2svn to compensate for changes in r1857,
which included commits to RCS files with non-trunk default branches.
svn path=/trunk/externals/tb/; revision=1858
Diffstat (limited to 'sc4pd/headers/server/IntFifo.h')
-rw-r--r-- | sc4pd/headers/server/IntFifo.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/sc4pd/headers/server/IntFifo.h b/sc4pd/headers/server/IntFifo.h new file mode 100644 index 0000000..3dde5ec --- /dev/null +++ b/sc4pd/headers/server/IntFifo.h @@ -0,0 +1,87 @@ +/* + SuperCollider real time audio synthesis system + Copyright (c) 2002 James McCartney. All rights reserved. + http://www.audiosynth.com + + 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#ifndef _IntFifo_ +#define _IntFifo_ + +#ifdef SC_DARWIN +# include <CoreServices/CoreServices.h> +#endif + +template <int N> +class IntFifo +{ +public: + IntFifo() + : mMask(N - 1), mReadHead(0), mWriteHead(0) + {} + + void MakeEmpty() { mReadHead = mWriteHead; } + bool IsEmpty() { return mReadHead == mWriteHead; } + bool HasData() { return mReadHead != mWriteHead; } + + bool Put(int data) + { + long next = NextPos(mWriteHead); + if (next == mReadHead) return false; // fifo is full + mItems[next] = data; +#ifdef SC_DARWIN + // we don't really need a compare and swap, but this happens to call + // the PowerPC memory barrier instruction lwsync. + CompareAndSwap(mWriteHead, next, &mWriteHead); +#elif defined SC_WIN32 + InterlockedExchange(reinterpret_cast<volatile LONG*>(&mWriteHead),next); +#else + mWriteHead = next; +#endif + return true; + } + + int32 Get() + { + //assert(HasData()); + long next = NextPos(mReadHead); + out = mItems[next].Perform(); +#ifdef SC_DARWIN + // we don't really need a compare and swap, but this happens to call + // the PowerPC memory barrier instruction lwsync. + CompareAndSwap(mReadHead, next, &mReadHead); +#elif defined SC_WIN32 + InterlockedExchange(reinterpret_cast<volatile LONG*>(&mReadHead),next); +#else + mReadHead = next; +#endif + } + +private: + int NextPos(int inPos) { return (inPos + 1) & mMask; } + + long mMask; +#ifdef SC_DARWIN + UInt32 mReadHead, mWriteHead; +#else + volatile int mReadHead, mWriteHead; +#endif + int32 mItems[N]; +}; + +#endif + + |