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From Darryl Bond <db...@nrggos.com.au>
Subject mod_jserv/6249: Jserv & PHP modules together will not spawn the java process
Date Wed, 28 Jun 2000 06:20:20 GMT

>Number:         6249
>Category:       mod_jserv
>Synopsis:       Jserv & PHP modules together will not spawn the java process
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    jserv
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Tue Jun 27 23:30:01 PDT 2000
>Originator:     dbond@nrggos.com.au
>Release:        1.3.12
SunOS stimpy 5.7 Generic_106541-09 sun4u sparc SUNW,Ultra-5_10

gcc version 2.8.1

JServ works fine if PHP module is not loaded but only rarely if PHP module is loaded
The java process does not start
Log shows that ap_standalone and getppid() are both non-zero

[28/06/2000 14:58:31:960] (INFO) Apache-JServ 1rst  initialization: JVM will be started later
1 16656 16655
[28/06/2000 14:59:02:291] (INFO) Apache Module was cleaned-up

but java process will not start but the logic in the code is clearly 
returning without spawning the java process (1rst)

Problem is resolved with the fix below.
Seems to be a race condition. A slower box with the same OS revision does not 
have any problems starting the java process with the original code.
Code in jserv_wrapper_unix.c shows
    if (ap_standalone && getppid()==1) {
                    "Apache-JServ 2nd  initialization starting JVM now: %d %d %d", ap_standalone,
getpid(), getppid()); 
    else {
                    "Apache-JServ 1rst  initialization: JVM will be started later %d %d %d",
ap_standalone, getpid(), getppid()); 
        return 0;
If the if statement is changed to 
    if (ap_standalone && getppid()) {
Then the problem goes away.
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