76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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typedef struct WaitQ WaitQ;
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typedef struct SudoG SudoG;
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typedef struct Select Select;
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typedef struct Scase Scase;
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typedef struct __go_type_descriptor Type;
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typedef struct __go_channel_type ChanType;
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struct SudoG
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{
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G* g;
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uint32* selectdone;
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SudoG* link;
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int64 releasetime;
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byte* elem; // data element
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};
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struct WaitQ
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{
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SudoG* first;
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SudoG* last;
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};
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// The garbage collector is assuming that Hchan can only contain pointers into the stack
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// and cannot contain pointers into the heap.
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struct Hchan
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{
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uintgo qcount; // total data in the q
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uintgo dataqsiz; // size of the circular q
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uint16 elemsize;
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uint16 pad; // ensures proper alignment of the buffer that follows Hchan in memory
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bool closed;
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const Type* elemtype; // element type
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uintgo sendx; // send index
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uintgo recvx; // receive index
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WaitQ recvq; // list of recv waiters
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WaitQ sendq; // list of send waiters
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Lock;
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};
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// Buffer follows Hchan immediately in memory.
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// chanbuf(c, i) is pointer to the i'th slot in the buffer.
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#define chanbuf(c, i) ((byte*)((c)+1)+(uintptr)(c)->elemsize*(i))
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enum
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{
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debug = 0,
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// Scase.kind
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CaseRecv,
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CaseSend,
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CaseDefault,
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};
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struct Scase
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{
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SudoG sg; // must be first member (cast to Scase)
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Hchan* chan; // chan
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uint16 kind;
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uint16 index; // index to return
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bool* receivedp; // pointer to received bool (recv2)
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};
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struct Select
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{
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uint16 tcase; // total count of scase[]
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uint16 ncase; // currently filled scase[]
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uint16* pollorder; // case poll order
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Hchan** lockorder; // channel lock order
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Scase scase[1]; // one per case (in order of appearance)
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};
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