From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Sat,  5 Sep 2015 09:41:02 -0700
To: 9fans@9fans.net
Message-ID: <b8520b52739689047e9d0543ae0a87c6@brasstown.quanstro.net>
In-Reply-To: <c5074e079951b5f122ddc9cf2fa08134@brasstown.quanstro.net>
References: <CAHL7psF6pK75inCaCd==Ay0eGmOm+QsqBjW2pM1F7HyTaWkNLg@mail.gmail.com>
	<c5074e079951b5f122ddc9cf2fa08134@brasstown.quanstro.net>
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Subject: Re: [9fans] Privalloc(2) and rfork(RFPROC|RFMEM) (was: a pair nec
	bugs)
Topicbox-Message-UUID: 68fa57fe-ead9-11e9-9d60-3106f5b1d025

by the way, the following program runs without asserting for me
with or without the waits.

- erik

---

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

void
task(void **p)
{
	assert(*p == nil);
	*p = (void*)(uintptr)getpid();
}

void
spawn(void (*t)(void**), void **p)
{
	int pid;

	switch(pid = rfork(RFMEM|RFPROC)){
	case -1:
		sysfatal("spawn: rfork: %r");
	case 0:
		t(p);
		exits("");
	default:
		USED(pid);
		return;
	}
}

void
main(void)
{
	int i, k;
	void **p;
	Waitmsg *w;

	p = privalloc();
	k = 0;
	for(i = 0; i < 1024; i++){
		spawn(task, p);
		for(k++; k > 16; k--){
			if((w = wait()) == nil)
				break;
			free(w);
		}
	}
	exits("");
}