shithub: 9intro

ref: a351bcdccdf5a4273bc8dc3360a48fbb8b8aa9ea
dir: /src/lock.c/

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

int	cnt;
Lock	cntlck;

void
main(int, char*[])
{
	int	i;

	if (rfork(RFPROC|RFMEM|RFNOWAIT) < 0)
		sysfatal("fork: %r");
	for (i = 0; i < 2; i++){
		lock(&cntlck);
		cnt++;
		unlock(&cntlck);
	}
	print("cnt is %d\n", cnt);
	exits(nil);
}