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From: Damon Anton Permezel <dap@damon.com>
Message-Id: <199712280314.VAA25423@damon.com>
Subject: Re: patches for JDK 1.1.5?
To: hsu@FreeBSD.ORG (Jeffrey Hsu)
Date: Sat, 27 Dec 1997 21:14:36 -0600 (CST)
Cc: hackers@hub.freebsd.org
In-Reply-To: <199712280023.QAA00226@hub.freebsd.org> from Jeffrey Hsu at "Dec 27, 97 04:23:32 pm"
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"Jeffrey Hsu sez: "
>   > I have a 1.1.4 port
>   > It works fairly well, but suffers occasionally from recursive malloc
>   > calls.
> 
> Copy /usr/src/lib/libc/stdlib/malloc.c and to
> src/solaris/java/runtime/malloc_md.c and modify THREAD_LOCK() and
> THREAD_UNLOCK() to call sysMonitorEnter(&_malloc_lock) and
> sysMonitorExit(&_malloc_lock).
> 
My approach was to redefine malloc to enter/exit a monitor, pick up "_malloc"
out of libc, and call the original, in a manner so that I had a general
solution which could be used for other libc funcs requiring serialization:

void*
malloc(size_t size) {
    void *res;

    if (!libcInitialized)
	initLibc();

    if (monitorsInitialized) {
	LIBC_LOCK(LIBC_MALLOC);

	res = (*libctable[LIBC_MALLOC].addr)(size);

	LIBC_UNLOCK(LIBC_MALLOC);
    } else
	res = (*libctable[LIBC_MALLOC].addr)(size);

    return res;
}

I was unable to get this to work, due to some problems with ld.so.
I will eventually go back an spend some more time of trying to figure out
what was happening there, but with the fallback of just copying
libc/.../malloc.c into the source, as you have.