shithub: 9intro

ref: 2b99422480d596ebc26921c87c6bb81a07949f3e
dir: /progs/lock.c.ms/

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.P1
.ps -1
.ti -1i
.B
.BX lock.c
.ps +1
.CW
.ps -2
.vs .15i
#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\en", cnt);
	exits(nil);
}
.ps +2
.P2