// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#define MAXALIGN 8
typedef struct WaitQ WaitQ;
typedef struct SudoG SudoG;
typedef struct Select Select;
typedef struct Scase Scase;
struct SudoG
{
G* g;
uint32* selectdone;
SudoG* link;
int64 releasetime;
byte* elem; // data element
};
struct WaitQ
{
SudoG* first;
SudoG* last;
};
// The garbage collector is assuming that Hchan can only contain pointers into the stack
// and cannot contain pointers into the heap.
struct Hchan
{
uintgo qcount; // total data in the q
uintgo dataqsiz; // size of the circular q
uint16 elemsize;
uint16 pad; // ensures proper alignment of the buffer that follows Hchan in memory
bool closed;
Type* elemtype; // element type
uintgo sendx; // send index
uintgo recvx; // receive index
WaitQ recvq; // list of recv waiters
WaitQ sendq; // list of send waiters
Lock;
};
// Buffer follows Hchan immediately in memory.
// chanbuf(c, i) is pointer to the i'th slot in the buffer.
#define chanbuf(c, i) ((byte*)((c)+1)+(uintptr)(c)->elemsize*(i))
enum
{
debug = 0,
// Scase.kind
CaseRecv,
CaseSend,
CaseDefault,
};
struct Scase
{
SudoG sg; // must be first member (cast to Scase)
Hchan* chan; // chan
byte* pc; // return pc
uint16 kind;
uint16 so; // vararg of selected bool
bool* receivedp; // pointer to received bool (recv2)
};
struct Select
{
uint16 tcase; // total count of scase[]
uint16 ncase; // currently filled scase[]
uint16* pollorder; // case poll order
Hchan** lockorder; // channel lock order
Scase scase[1]; // one per case (in order of appearance)
};