Re: [9fans] C-program error..

[rsc@plan9.bell-labs.com]

A few problems.  The main one is that you
sent a 32-byte array and tried to read it
into what was pointed at by an uninitialized pointer.
Compiling with -w would catch this.

The second is that you need to use threadprint
instead of print to avoid stack problems.
Threadprint is like fprint, so you need
to give a file descriptor.

The below works for me.

Russ


#include <u.h>
#include <libc.h>
#include <thread.h>

#define STACKSIZE (2*2048)

void
recvit(void *arg)
{
	char *s;
	Channel *in;	/* of char* */

	in = arg;
	s = recvp(in);
	threadprint(1, "%s\n", s);
	threadexits(0);
}

void
threadmain(int argc, char *argv[])
{
	Channel *sch;	/* of char* */

	sch = chancreate(sizeof(char*), 0);
	proccreate(recvit, (void *)sch, STACKSIZE);
	sendp(sch, "hello world");
	threadprint(1, "done\n");
	threadexitsall(nil);
}