MFIFO.bsv
上传用户:aoptech
上传日期:2014-09-22
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- // The MIT License
- //
- // Copyright (c) 2006 Nirav Dave (ndave@csail.mit.edu)
- //
- // Permission is hereby granted, free of charge, to any person obtaining a copy
- // of this software and associated documentation files (the "Software"), to deal
- // in the Software without restriction, including without limitation the rights
- // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- // copies of the Software, and to permit persons to whom the Software is
- // furnished to do so, subject to the following conditions:
- //
- // The above copyright notice and this permission notice shall be included in
- // all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- // THE SOFTWARE.
- import FIFOF::*;
- interface MFIFO#(type alpha);
- method Action enq(alpha x);
- method Action deq();
- method Maybe#(alpha) first();
- method Action clear();
- endinterface
- module mkMFIFO(MFIFO#(alpha)) provisos(Bits#(alpha, asx));
-
- FIFOF#(alpha) f <- mkUGFIFOF();
-
- method Action enq(x) if(f.notFull);
- f.enq(x);
- endmethod
- method Action deq();
- if (f.notEmpty)
- f.deq();
- endmethod
-
- method Maybe#(alpha) first();
- return (f.notEmpty) ? Just(f.first()) : Nothing;
- endmethod
-
- method Action clear();
- f.clear();
- endmethod
-
- endmodule