143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#pragma src "/sys/src/libthread"
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#pragma lib "libthread.a"
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#pragma varargck argpos chanprint 2
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typedef struct Alt Alt;
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typedef struct Channel Channel;
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typedef struct Ref Ref;
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/*
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* Channel structure. S is the size of the buffer. For unbuffered channels
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* s is zero. v is an array of s values. If s is zero, v is unused.
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* f and n represent the state of the queue pointed to by v.
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*/
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enum {
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Nqwds = 2,
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Nqshift = 5, /* log₂ # of bits in long */
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Nqmask = -1,
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Nqbits = (1 << Nqshift) * 2,
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};
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struct Channel {
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int s; /* Size of the channel (may be zero) */
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uint f; /* Extraction point (insertion pt: (f+n) % s) */
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uint n; /* Number of values in the channel */
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int e; /* Element size */
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int freed; /* Set when channel is being deleted */
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volatile Alt **qentry; /* Receivers/senders waiting (malloc) */
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volatile int nentry; /* # of entries malloc-ed */
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volatile int closed; /* channel is closed */
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uchar v[1]; /* Array of s values in the channel */
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};
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/* Channel operations for alt: */
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typedef enum {
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CHANEND,
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CHANSND,
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CHANRCV,
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CHANNOP,
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CHANNOBLK,
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} ChanOp;
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struct Alt {
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Channel *c; /* channel */
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void *v; /* pointer to value */
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ChanOp op; /* operation */
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char *err; /* did the op fail? */
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/*
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* the next variables are used internally to alt
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* they need not be initialized
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*/
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Channel **tag; /* pointer to rendez-vous tag */
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int entryno; /* entry number */
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};
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struct Ref {
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long ref;
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};
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int alt(Alt alts[]);
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int chanclose(Channel*);
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int chanclosing(Channel *c);
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Channel*chancreate(int elemsize, int bufsize);
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int chaninit(Channel *c, int elemsize, int elemcnt);
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void chanfree(Channel *c);
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int chanprint(Channel *, char *, ...);
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long decref(Ref *r); /* returns 0 iff value is now zero */
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void incref(Ref *r);
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int nbrecv(Channel *c, void *v);
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void* nbrecvp(Channel *c);
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ulong nbrecvul(Channel *c);
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int nbsend(Channel *c, void *v);
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int nbsendp(Channel *c, void *v);
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int nbsendul(Channel *c, ulong v);
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void needstack(int);
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int proccreate(void (*f)(void *arg), void *arg, uint stacksize);
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int procrfork(void (*f)(void *arg), void *arg, uint stacksize, int flag);
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void** procdata(void);
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void procexec(Channel *, char *, char *[]);
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void procexecl(Channel *, char *, ...);
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int recv(Channel *c, void *v);
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void* recvp(Channel *c);
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ulong recvul(Channel *c);
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int send(Channel *c, void *v);
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int sendp(Channel *c, void *v);
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int sendul(Channel *c, ulong v);
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int threadcreate(void (*f)(void *arg), void *arg, uint stacksize);
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void** threaddata(void);
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void threadexits(char *);
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void threadexitsall(char *);
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int threadgetgrp(void); /* return thread group of current thread */
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char* threadgetname(void);
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void threadint(int); /* interrupt thread */
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void threadintgrp(int); /* interrupt threads in grp */
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void threadkill(int); /* kill thread */
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void threadkillgrp(int); /* kill threads in group */
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void threadmain(int argc, char *argv[]);
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void threadnonotes(void);
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int threadnotify(int (*f)(void*, char*), int in);
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int threadid(void);
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int threadpid(int);
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int threadsetgrp(int); /* set thread group, return old */
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void threadsetname(char *fmt, ...);
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Channel*threadwaitchan(void);
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int tprivalloc(void);
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void tprivfree(int);
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void **tprivaddr(int);
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void yield(void);
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extern int mainstacksize;
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/* slave I/O processes */
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typedef struct Ioproc Ioproc;
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#pragma incomplete Ioproc
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Ioproc* ioproc(void);
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void closeioproc(Ioproc*);
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void iointerrupt(Ioproc*);
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int ioclose(Ioproc*, int);
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int iodial(Ioproc*, char*, char*, char*, int*);
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int ioopen(Ioproc*, char*, int);
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long ioread(Ioproc*, int, void*, long);
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long ioreadn(Ioproc*, int, void*, long);
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long iowrite(Ioproc*, int, void*, long);
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int iosleep(Ioproc*, long);
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long iocall(Ioproc*, long (*)(va_list*), ...);
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void ioret(Ioproc*, int);
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