?? chan.c.svn-base
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static char rcsid[] = "$Id: H:/drh/idioms/book/RCS/thread.doc,v 1.11 1997/02/21 19:50:51 drh Exp $";#include <string.h>#include "assert.h"#include "mem.h"#include "chan.h"#include "sem.h"#define T Chan_Tstruct T { const void *ptr; int *size; Sem_T send, recv, sync;};T Chan_new(void) { T c; NEW(c); Sem_init(&c->send, 1); Sem_init(&c->recv, 0); Sem_init(&c->sync, 0); return c;}int Chan_send(Chan_T c, const void *ptr, int size) { assert(c); assert(ptr); assert(size >= 0); Sem_wait(&c->send); c->ptr = ptr; c->size = &size; Sem_signal(&c->recv); Sem_wait(&c->sync); return size;}int Chan_receive(Chan_T c, void *ptr, int size) { int n; assert(c); assert(ptr); assert(size >= 0); Sem_wait(&c->recv); n = *c->size; if (size < n) n = size; *c->size = n; if (n > 0) memcpy(ptr, c->ptr, n); Sem_signal(&c->sync); Sem_signal(&c->send); return n;}?? 快捷鍵說明
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