Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/locktest/lpingpong.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,
};

Lock sem1;
uchar buffer[128];
Lock sem2;
uchar buffer2[128];

void
thread1(void)
{
	int i;

	for(i = 0; i < N; i++){
		unlock(&sem2);
		lock(&sem1);
	}
	unlock(&sem2);
	wait();
	exits("");
}

void
thread2(void)
{
	int i;

	for(i = 0; i < N; i++){
		unlock(&sem1);
		lock(&sem2);
	}
	unlock(&sem1);
	exits("");
}

void
main(void)
{
	lock(&sem1);
	lock(&sem2);

	switch(rfork(RFPROC|RFMEM)){
	case -1:
		sysfatal("fork: %r");
	case 0:
		thread2();
	default:
		thread1();
	}
}

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