Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/locktest/rpingpong.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


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

enum {
	N	= 1 * 1000*1000,
};

int	tag1;
int	tag2;

void
thread(void)
{
	int i;

	for(i = 0; i < N; i++){
		while(rendezvous(&tag1, nil) == (void*)-1)
			;
		while(rendezvous(&tag2, nil) == (void*)-1)
			;
	}
}

void
main(void)
{
	switch(rfork(RFPROC|RFMEM)){
	case -1:
		sysfatal("fork: %r");
	case 0:
		thread();
		exits("");
	default:
		thread();
		wait();
		exits("");
	}
}

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